COMPOUND HAVING BENZAZOLE RING STRUCTURE AND ORGANIC ELECTROLUMINESCENT ELEMENT

Abstract

To provide an organic compound having a high electron injection/transport performances, an excellent hole blocking ability, and a stable thin-film state, as a material for organic electroluminescent devices with high efficiency and high durability, and also to provide an organic electroluminescent device having a high efficiency and high durability by using the compound. An organic electroluminescent device comprising a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, wherein the compound having a benzazole ring structure of the general formula (1) is used as a constituent material of at least one organic layer.

Description

EXAMPLE 1

Synthesis of 4,6-bis(4-naphthalene-1-yl-phenyl)-2-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-1)

2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole (4.5 g), 3-pyridylboronic acid (1.0 g), bis(dibenzylideneacetone)palladium(0) (0.32 g), tricyclohexylphosphine (0.4 g), and tripotassium phosphate (4.7 g) were added into reaction vessel. The mixture was refluxed for overnight while stirring. After cooling, an organic layer was collected by liquid separation, and ethyl acetate were added to the aqueous layer for extraction. The collected organic layer was concentrated, and then the resulting crude product was purified by column chromatography (support: silica gel, eluent: dichloromethane/ethyl acetate), and the crystallization with a dichloromethane/methanol mixed solvent whereby a white powder of 4,6-bis(4-naphthalene-1-yl-phenyl)-2-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-1; 1.8 g; yield: 38%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=8.98 (1H), 8.68 (1H), 8.52 (2H), 8.34 (2H), 8.12 (1H), 8.07-7.89 (10H), 7.82 (2H), 7.76 (2H), 7.69 (2H), 7.64 (9H).

EXAMPLE 2

Synthesis of 2-{4′-(pyridine-3-yl)-1,1′-biphenyl-4-yl}-4,6-di(naphthalene-1-yl)-benzoxazole (Compound 1-2)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-4,6-di(naphthalene-1-yl)-benzoxazole, and 3-pyridylboronic acid was replaced with 4-(pyridine-3-yl)-phenylboronic acid, whereby a white powder of 2-{4′-(pyridine-3-yl)-1,1′-biphenyl-4-yl}-4,6-di(naphthalene-1-yl)-benzoxazole (Compound 1-2; 2.1 g; yield: 34%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 28 hydrogen signals, as follows.

δ(ppm)=8.94 (1H), 8.64 (1H), 8.35 (2H), 8.13 (1H), 8.05-7.91 (6H), 7.85 (1H), 7.82-7.76 (5H), 7.72 (2H), 7.68 (2H), 7.64-7.38 (7H).

EXAMPLE 3

Synthesis of 4,6-bis(4-naphthalene-1-yl-phenyl)-2-(3-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-3)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(3-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 4,6-bis(4-naphthalene-1-yl-phenyl)-2-(3-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-3; 3.6 g; yield: 48%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=9.01 (1H), 8.69 (1H), 8.60 (1H), 8.43 (1H), 8.32 (2H), 8.11 (1H), 8.07-8.01 (3H), 7.98-7.88 (7H), 7.83-7.67 (6H), 7.62-7.42 (9H).

EXAMPLE 4

Synthesis of 2-{3′-(pyridine-3-yl)-1,1′-biphenyl-4-yl}-4,6-di(naphthalene-1-yl)-benzoxazole (Compound 1-4)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-4,6-di(naphthalene-1-yl)-benzoxazole, and 3-pyridylboronic acid was replaced with 3-(pyridine-3-yl)-phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-{3′-(pyridine-3-yl)-1,1′-biphenyl-4-yl}-4,6-di(naphthalene-1-yl)-benzoxazole (Compound 1-4; 4.4 g; yield: 71%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 28 hydrogen signals, as follows.

δ(ppm)=8.94 (1H), 8.65 (1H), 8.36 (2H), 8.21 (1H), 8.05-7.92 (6H), 7.85 (2H), 7.83-7.76 (3H), 7.75-7.74 (12H).

EXAMPLE 5

Synthesis of 2-(3-pyridine-4-yl-phenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole (Compound 1-5)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(3-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with 4-pyridylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-(3-pyridine-4-yl-phenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole (Compound 1-5; 3.0 g; yield: 40%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=8.76 (2H), 8.66 (1H), 8.47 (1H), 8.32 (2H), 8.11 (1H), 8.07-8.02 (2H), 7.99-7.89 (7H), 7.85 (1H), 7.78-7.48 (15H).

EXAMPLE 6

Synthesis of 2-{4′-(pyridine-3-yl)-1,1′-biphenyl-4-yl}-4,6-di(phenanthrene-9-yl)-benzoxazole (Compound 1-6)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-4,6-di(phenanthrene-9-yl)-benzoxazole, and 3-pyridylboronic acid was replaced with 4-(pyridine-3-yl)phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-{4′-(pyridine-3-yl)-1,1′-biphenyl-4-yl}-4,6-di(phenanthrene-9-yl)-benzoxazole (Compound 1-6; 2.1 g; yield: 17%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=8.93 (1H), 8.87-8.63 (4H), 8.62 (1H), 8.33 (2H), 8.18 (1H), 8.08-7.88 (7H), 7.80-7.55 (15H), 7.40 (1H).

EXAMPLE 7

Synthesis of 2-{3′-(pyridine-3-yl)-1,1′-biphenyl-3-yl}-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole (Compound 1-7)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(3-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with 3-(pyridine-3-yl)phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-{3′-(pyridine-3-yl)-1,1′-biphenyl-3-yl}-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole (Compound 1-7; 2.0 g; yield: 27%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 36 hydrogen signals, as follows.

δ(ppm)=8.98 (1H), 8.68-8.61 (2H), 8.42 (1H), 8.32 (2H), 8.15-7.40 (30H).

EXAMPLE 8

Synthesis of 2-{3′-(pyridine-3-yl)-1,1′-biphenyl-4-yl}-4,6-di(phenanthrene-9-yl)-benzoxazole (Compound 1-8)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-4,6-di(phenanthrene-9-yl)-benzoxazole, and 3-pyridylboronic acid was replaced with 3-(pyridine-3-yl)phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-{3′-(pyridine-3-yl)-1,1′-biphenyl-4-yl}-4,6-di(phenanthrene-9-yl)-benzoxazole (Compound 1-8; 4.0 g; yield: 33%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=8.93 (1H), 8.87-8.73 (4H), 8.65 (1H), 8.36 (2H), 8.18 (1H), 8.08-7.83 (8H), 7.79-7.54 (14H), 7.42 (1H).

EXAMPLE 9

Synthesis of 6-(biphenyl-3-yl)-2-(biphenyl-4-yl)-4-(9-phenyl-[9H]-carbazol-3-yl)-benzoxazole (Compound 1-73)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 6-(biphenyl-3-yl)-2-(4-chlorophenyl)-4-(9-phenyl-[9H]-carbazol-3-yl)-benzoxazole, and 3-pyridylboronic acid was replaced with phenylboronic acid, whereby a white powder of 6-(biphenyl-3-yl)-2-(biphenyl-4-yl)-4-(9-phenyl-[9H]-carbazol-3-yl)-benzoxazole (Compound 1-73; 3.0 g; yield: 44%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=8.90 (1H), 8.45 (2H), 8.30 (1H), 8.26 (1H), 7.94 (1H), 7.91 (1H), 7.85 (2H), 7.80 (3H), 7.74-7.32 (20H).

EXAMPLE 10

Synthesis of 2-{3′-(pyridine-3-yl)-biphenyl-4-yl}-6-(9,9′-spirobi[9H]fluorene-2-yl)-benzoxazole (Compound 1-91)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(9,9′-spirobi[9H]fluorene-2-yl)-benzoxazole, and 3-pyridylboronic acid was replaced with 3-(pyridine-3-yl)-phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-{3′-(pyridine-3-yl)-biphenyl-4-yl}-6-(9,9′-spirobi[9H]fluorene-2-yl)-benzoxazole (Compound 1-91; 10.5 g; yield: 58%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 30 hydrogen signals, as follows.

δ(ppm)=8.94 (1H), 8.66 (1H), 8.33 (2H), 8.01-7.77 (8H), 7.77-7.57 (6H), 7.52-7.37 (5H), 7.15 (3H), 7.03 (1H), 6.82 (2H), 6.78 (1H).

EXAMPLE 11

Synthesis of 4,6-bis(biphenyl-3-yl)-2-([1,1′:3′,1″]terphenyl-4-yl)-benzoxazole (Compound 1-96)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 4,6-bis(biphenyl-3-yl)-2-(4-chlorophenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with 3-biphenylboronic acid, whereby a white powder of 4,6-bis(biphenyl-3-yl)-2-([1,1′:3′,1″]terphenyl-4-yl)-benzoxazole (Compound 1-96; 8.3 g; yield: 68.0%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 33 hydrogen signals, as follows.

δ(ppm)=8.44 (2H), 8.35 (1H), 8.14 (1H), 8.00-7.82 (6H), 7.80-7.47 (20H), 7.46-7.37 (3H).

EXAMPLE 12

Synthesis of 4,6-di(dibenzofuran-4-yl)-2-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-100)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-4,6-di(dibenzofuran-4-yl)-benzoxazole, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a yellow powder of 4,6-di(dibenzofuran-4-yl)-2-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-100; 7.3 g; yield: 61%) was obtained.

The structure of the obtained yellow powder was identified by NMR.

¹H-NMR (CDCl₃) detected 24 hydrogen signals, as follows.

δ(ppm)=8.96 (1H), 8.67 (1H), 8.59 (1H), 8.47 (2H), 8.37 (1H), 8.32 (1H), 8.06 (4H), 7.99 (1H), 7.84 (1H), 7.78 (2H), 7.69 (1H), 7.62 (1H), 7.61 (1H), 7.58-7.36 (6H).

EXAMPLE 13

Synthesis of 2,6-diphenyl-4-(9,9′-spirobi[9H]fluorene-2-yl)-benzoxazole (Compound 1-106)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 6-chloro-2-phenyl-4-(9,9′-spirobi[9H]fluorene-2-yl)-benzoxazole, and 3-pyridylboronic acid was replaced with phenylboronic acid, whereby a white powder of 2,6-diphenyl-4-(9,9′-spirobi[9H]fluorene-2-yl)-benzoxazole (Compound 1-106; 4.5 g; yield: 41%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 27 hydrogen signals, as follows.

δ(ppm)=8.15-7.98 (6H), 7.97-7.85 (4H), 7.60-7.36 (9H), 7.17 (4H), 6.90-6.80 (4H) Example 14

Synthesis of 2-{3,5-di([9H]-carbazol-9-yl)-phenyl}-4,6-diphenyl-benzoxazole (Compound 1-107)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(3,5-dichlorophenyl)-4,6-diphenyl-benzoxazole, and 3-pyridylboronic acid was replaced with carbazol, whereby a white powder of 2-{3,5-di([9H]-carbazol-9-yl)-phenyl}-4,6-diphenyl-benzoxazole (Compound 1-107; 4.8 g; yield: 30%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 31 hydrogen signals, as follows.

δ(ppm)=8.67 (2H), 8.21 (4H), 8.10 (2H), 8.01 (1H), 7.85 (1H), 7.79 (1H), 7.73 (2H), 7.63 (4H), 7.57-7.46 (8H), 7.46-7.33 (6H).

EXAMPLE 15

Synthesis of 4-(4-naphthalene-1-yl-phenyl)-6-{9-phenyl-[9H]-carbazol-3-yl)-2-(3-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-108)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(3-chlorophenyl)-4-(4-naphthalene-1-yl-phenyl)-6-(9-phenyl-[9H]-carbazol-3-yl)-benzoxazole, whereby a white powder of 4-(4-naphthalene-1-yl-phenyl)-6-(9-phenyl-[9H]-carbazol-3-yl)-2-(3-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-108; 2.6 g; yield: 47%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 33 hydrogen signals, as follows.

δ(ppm)=9.01 (1H), 8.69 (1H), 8.61 (1H), 8.53 (1H), 8.44 (1H), 8.35 (2H), 8.28 (1H), 8.14 (1H), 8.06 (1H), 8.05 (1H), 7.97 (1H), 7.96 (1H), 7.93 (1H), 7.86-7.42 (18H), 7.37 (1H).

EXAMPLE 16

Synthesis of 2-phenyl-6-(9-phenyl-[9H]-carbazol-3-yl)-4-(5-phenyl-[5H]-pyrido[4,3-b]indole-8-yl)-benzoxazole (Compound 1-110)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 6-chloro-2-phenyl-4-(5-phenyl-[5H]-pyrido[4,3-b]indole-8-yl)-benzoxazole, and 3-pyridylboronic acid was replaced with 9-phenyl-[9H]-carbazol-3-yl-boronic acid, whereby a yellow powder of 2-phenyl-6-(9-phenyl-[9H]-carbazol-3-yl)-4-(5-phenyl-[5H]-pyrido[4,3-b]indole-8-yl)-benzoxazole (Compound 1-110; 2.9 g; yield: 50%) was obtained.

The structure of the obtained yellow powder was identified by NMR.

¹H-NMR (CDCl₃) detected 30 hydrogen signals, as follows.

δ(ppm)=9.56 (1H), 9.04 (1H), 8.59 (1H), 8.53 (1H), 8.48 (1H), 8.45 (1H), 8.36 (1H), 8.26 (2H), 8.05 (1H), 7.93 (2H), 7.88-7.43 (16H), 7.36 (2H).

EXAMPLE 17

Synthesis of 6-(4-naphthalene-1-yl-phenyl)-2-(biphenyl-4-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-112)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(4-naphthalene-1-yl-phenyl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 6-(4-naphthalene-1-yl-phenyl)-2-(biphenyl-4-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-112; 4.8 g; yield: 56%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 30 hydrogen signals, as follows.

δ(ppm)=9.00 (1H), 8.66 (1H), 8.45 (2H), 8.33 (2H), 8.07-7.78 (12H), 7.70 (4H), 7.63-7.40 (8H).

EXAMPLE 18

Synthesis of 2,6-bis(4-naphthalene-1-yl-phenyl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-113)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(4-naphthalene-1-yl-phenyl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with 1-naphthaleneboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2,6-bis(4-naphthalene-1-yl-phenyl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-113; 6.1 g; yield: 66%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=9.01 (1H), 8.66 (1H), 8.51 (2H), 8.35 (2H), 8.09-7.80 (13H), 7.73 (2H), 7.69 (2H), 7.64-7.40 (9H).

EXAMPLE 19

Synthesis of 2-(biphenyl-4-yl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-118)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-(biphenyl-4-yl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-118; 4.3 g; yield: 67%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 28 hydrogen signals, as follows.

δ(ppm)=8.98 (1H), 8.86 (1H), 8.80 (1H), 8.64 (1H), 8.46 (2H), 8.32 (2H), 8.07 (1H), 7.98 (2H), 7.88-7.57 (13H), 7.52 (2H), 7.44 (2H).

EXAMPLE 20

Synthesis of 2-(biphenyl-4-yl)-6-(phenanthrene-9-yl)-4-(3-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-119)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(phenanthrene-9-yl)-4-(3-pyridine-3-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-(biphenyl-4-yl)-6-(phenanthrene-9-yl)-4-(3-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-119; 3.0 g; yield: 35%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 28 hydrogen signals, as follows.

δ(ppm)=9.02 (1H), 8.85 (1H), 8.79 (1H), 8.64 (1H), 8.45 (2H), 8.43 (1H), 8.19 (1H), 8.07 (1H), 8.02 (1H), 7.97 (1H), 7.89-7.78 (5H), 7.78-7.39 (12H).

EXAMPLE 21

Synthesis of 6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-2-([1,1′:4′,1″]terphenyl-4-yl)-benzoxazole (Compound 1-120)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with 4-biphenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-2-([1,1′:4′,1″]terphenyl-4-yl)-benzoxazole (Compound 1-120; 2.8 g; yield: 36%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=8.98 (1H), 8.86 (1H), 8.80 (1H), 8.64 (1H), 8.48 (2H), 8.33 (2H), 8.08 (1H), 7.98 (2H), 7.90-7.57 (17H), 7.51 (2H), 7.41 (2H).

EXAMPLE 22

Synthesis of 2-(4-naphthalene-2-yl-phenyl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-122)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with 2-naphthaleneboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-(4-naphthalene-2-yl-phenyl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-122; 3.0 g; yield: 43%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 30 hydrogen signals, as follows.

δ(ppm)=8.98 (1H), 8.86 (1H), 8.80 (1H), 8.65 (1H), 8.51 (2H), 8.33 (2H), 8.17 (1H), 8.08 (1H), 8.03-7.90 (7H), 7.89-7.51 (12H), 7.42 (1H).

EXAMPLE 23

Synthesis of 2-phenyl-4-(4-pyridine-3-yl-phenyl)-6-(triphenylene-2-yl)-benzoxazole (Compound 1-125)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 6-chloro-2-phenyl-4-(4-pyridine-3-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with 2-triphenyleneboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a white powder of 2-phenyl-4-(4-pyridine-3-yl-phenyl)-6-(triphenylene-2-yl)-benzoxazole (Compound 1-125; 5.9 g; yield: 28%) was obtained.

The structure of the obtained white powder was identified by NMR.

¹H-NMR (CDCl₃) detected 26 hydrogen signals, as follows.

δ(ppm)=8.99 (2H), 8.85-8.63 (6H), 8.35 (2H), 8.33 (2H), 8.08-7.97 (4H), 7.83 (2H), 7.72 (4H), 7.59 (3H), 7.44 (1H).

EXAMPLE 24

Synthesis of 6-(phenanthrene-9-yl)-2-{3′-(pyridine-3-yl)-biphenyl-4-yl}-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-131)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzoxazole, and 3-pyridylboronic acid was replaced with 3-(pyridine-3-yl)phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a yellow powder of 6-(phenanthrene-9-yl)-2-{3′-(pyridine-3-yl)-biphenyl-4-yl}-4-(4-pyridine-3-yl-phenyl)-benzoxazole (Compound 1-131; 3.4 g; yield: 43%) was obtained.

The structure of the obtained yellow powder was identified by NMR.

¹H-NMR (CDCl₃) detected 31 hydrogen signals, as follows.

δ(ppm)=9.04 (1H), 8.67 (1H), 8.47 (2H), 8.15 (4H), 8.08-7.72 (15H), 7.72-7.42 (8H).

EXAMPLE 25

Synthesis of 4,6-bis(4-naphthalene-1-yl-phenyl)-2-(4-pyridine-3-yl-phenyl)-benzothiazole (Compound 2-1)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzothiazole, whereby a yellow powder of 4,6-bis(4-naphthalene-1-yl-phenyl)-2-(4-pyridine-3-yl-phenyl)-benzothiazole (Compound 2-1; 3.5 g; yield: 21%) was obtained.

The structure of the obtained yellow powder was identified by NMR.

¹H-NMR (CDCl₃) detected 32 hydrogen signals, as follows.

δ(ppm)=8.98 (1H), 8.68 (1H), 8.52 (2H), 8.40-8.25 (3H), 8.12 (1H), 8.07-7.69 (15H), 7.64 (9H).

EXAMPLE 26

Synthesis of 2-(biphenyl-4-yl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzothiazole (Compound 2-63)

The reaction was carried out under the same conditions as those of Example 1, except that 2-(4-chlorophenyl)-4,6-bis(4-naphthalene-1-yl-phenyl)-benzoxazole was replaced with 2-(4-chlorophenyl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzothiazole, and 3-pyridylboronic acid was replaced with phenylboronic acid, and bis(dibenzylideneacetone)palladium(0) was replaced with tris(dibenzylideneacetone)palladium(0), whereby a yellow powder of 2-(biphenyl-4-yl)-6-(phenanthrene-9-yl)-4-(4-pyridine-3-yl-phenyl)-benzothiazole (Compound 2-63; 2.0 g; yield: 24%) was obtained.

The structure of the obtained yellow powder was identified by NMR.

¹H-NMR (CDCl₃) detected 28 hydrogen signals, as follows.

δ(ppm)=8.98 (1H), 8.86 (1H), 8.80 (1H), 8.64 (1H), 8.46 (2H), 8.32 (2H), 8.12-7.93 (4H), 7.88-7.57 (12H), 7.52 (2H), 7.44 (2H).

Claims

1. A compound of the following general formula (1) having a benzazole ring structure:

2. The compound having a benzazole ring structure according to claim 1, wherein the compound is represented by the following general formula (2):

3. The compound having a benzazole ring structure according to claim 1, wherein the compound is represented by the following general formula (3):

4. The compound having a benzazole ring structure according to claim 1, wherein the compound is represented by the following general formula (4):

5. The compound having a benzazole ring structure according to claim 1, wherein the compound is represented by the following general formula (5):

6. The compound having a benzazole ring structure according to claim 1, wherein the compound is represented by the following general formula (6):

7. An organic electroluminescent device comprising a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, wherein the compound having a benzazole ring structure according to claim 1 is used as a constituent material of at least one organic layer.

8. The organic electroluminescent device according to claim 7, wherein the organic layer using the compound having a benzazole ring structure is an electron transport layer.

9. The organic electroluminescent device according to claim 7, wherein the organic layer using the compound having a benzazole ring structure is a hole blocking layer.

10. The organic electroluminescent device according to claim 7, wherein the organic layer using the compound having a benzazole ring structure is a light emitting layer.

11. The organic electroluminescent device according to claim 7, wherein the organic layer using the compound having a benzazole ring structure is an electron injection layer.

12. An organic electroluminescent device comprising a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, wherein the compound having a benzazole ring structure according to claim 2 is used as a constituent material of at least one organic layer.

13. An organic electroluminescent device comprising a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, wherein the compound having a benzazole ring structure according to claim 3 is used as a constituent material of at least one organic layer.

14. An organic electroluminescent device comprising a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, wherein the compound having a benzazole ring structure according to claim 4 is used as a constituent material of at least one organic layer.

15. An organic electroluminescent device comprising a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, wherein the compound having a benzazole ring structure according to claim 5 is used as a constituent material of at least one organic layer.

16. An organic electroluminescent device comprising a pair of electrodes, and one or more organic layers sandwiched between the pair of electrodes, wherein the compound having a benzazole ring structure according to claim 6 is used as a constituent material of at least one organic layer.

17. The organic electroluminescent device according to claim 12, wherein the organic layer using the compound having a benzazole ring structure is an electron transport layer.

18. The organic electroluminescent device according to claim 12, wherein the organic layer using the compound having a benzazole ring structure is a hole blocking layer.

19. The organic electroluminescent device according to claim 12, wherein the organic layer using the compound having a benzazole ring structure is a light emitting layer.

20. The organic electroluminescent device according to claim 12, wherein the organic layer using the compound having a benzazole ring structure is an electron injection layer.