2-Exo-hydroxy-endo-tricyclo[6.2.1.0.sup.2,7 ]undecane

Abstract

Disclosed is 2-exo-hydroxy-endo-tricyclo[6.2.1.0.sup.2,7 ]undecane represented by the following formula (I): ##STR1## The tricycloundecanol of the formula (I) has green, camphor-like and woody odor and is useful as an aroma chemical. Furthermore, owing to the aliphatic polycyclic structure like adamantyl alcohol, it is expected to have antiviral, antimicroviral and plant hormone activities.The tricycloundecanol (I) of the invention is prepared by subjecting endo-tricyclo[6.2.1.0.sup.2,7 ]undecane to hydroxylation at the bridgehead position with a substituted perbenzoic acid.

Description

BACKGROUND OF THE INVENTION

This invention relates to a novel tricycloundecanol and, more particularly, to 2-exohydroxy-endo-tricyclo[6.2.1.0.sup.2,7 ]undecane represented by the following formula (I): ##STR2##

The tricycloundecanol of the formula (I) according to the invention has a green, camphor-like and woody odor, reminiscent of a component of patchouli oil and is useful as an aroma chemical. Furthermore, since it has an aliphatic polycyclic structure like naturally occurring sesquiterpene alcohols and synthetic tricyclic aliphatic alcohols such as adamantyl alcohol, it is expected to have various physiological activities owned by said alcohols, namely antiviral, antimicrobial and plant hormone activities, among others.

DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS

The tricycloundecanol (I) according to the invention is produced, for example, by subjecting endo-tricyclo[6.2.1.0.sup.2,7 ]undecane (II) to hydroxylation at the bridgehead position (the present inventors, Synthesis, 1983, 293) with a substituted perbenzoic acid, such as m-chloroperbenzoic acid, in accordance with the following reaction equation: ##STR3##

Thus, for instance, the reaction is suitably carried out by heating under reflux the starting material endo-tricyclo[6.2.1.0.sup.2,7 ]undecane (II) and 1 to 10 moles, per mole of (II), of a peracid in a halogenated hydrocarbon solvent, such as chloroform, methylene chloride or carbon tetrachloride, or in an aromatic hydrocarbon solvent, such as benzene, toluene or xylene, or in some other appropriate solvent for 5 to 40 hours.

The starting material for practising the invention, the tricycloundecane (II), can be synthesized, for example, by hydrogenating 3,6-dioxoendo-tricyclo[6.2.1.0.sup.2,7 ]undeca-4,9-diene (III), which is obtainable by the Diels-Alder reaction between cyclopentadiene and parabenzoquinone, and then subjecting the hydrogenation product to the Wolff-Kishner reduction [C. Swithenbank et al., J. Chem. Soc., 4573 (1963)] in accordance with the following reaction scheme: ##STR4##

The following examples illustrate the invention.

EXAMPLE 1

A mixture of 1.50 (10 mmol) of endo-tricyclo[6.2.1.0.sup.2,7 ]undecane, 1.73 g (10 mmol) of m-chloroperbenzoic acid and 15 ml of 1,2-dichloroethane is heated with stirring at 65.degree. C. (bath temperature) for 24 hours. After cooling, 50 ml of 1,2-dichloroethane is added, and the whole mixture is washed twice with two 15-ml portions of 1N aqueous sodium hydroxide and then with water, dried over anhydrous sodium sulfate, and concentrated. The concentrate is subjected to silica gel column chromatography. After removal of unreacted tricycloundecane by elution with n-hexane, elution is carried out with n-hexane-chloroform (3:1) and 0.66 g (39.5% yield) of 2-exo-hydroxy-endo-tricyclo[6.2.1.0.sup.2,7 ]undecane is recovered from the eluate. This product has a strong camphor-like odor.

Melting point: 52.5.degree.-53.degree. C.

Boiling point: 70.degree. C./1 mm Hg.

Elementary analysis:

Calculated for C.sub.11 H.sub.18 O: C, 79.5%; H, 10.9%; Found: C, 79.6%; H, 11.0%;

IR (KBr, cm.sup.-1): 3350, 2950, 2875, 2850, 1480, 1460, 1370, 1320, 1295, 1260, 1235, 1220, 1175, 1125, 1080, 1065, 1030, 995, 980, 955, 930, 920, 885, 825.

.sup.1 H-NMR (solvent: CDCl.sub.3 ; internal standard: TMS; .delta.): 0.9-2.3 (complicated multiplet, 17H) 1.7 (s, 1H, --OH).

.sup.13 C-NMR (solvent: CDCl.sub.3 ; internal standard: TMS; .delta.c): 16.0(t), 19.5(t), 21.0(t), 21.2(t), 24.2(t), 26.9(t), 36.5(t), 40.4(d), 49.2(d), 51.5(d), 78.4(s).

MS (m/e, relative intensity) 166(M.sup.+,1), 148(13), 120(33), 98(100), 92(21), 91(29), 79(19), 70(15), 67(22), 41(20).

EXAMPLE 2

______________________________________Lavender cologne: % by weight______________________________________Lavender oil 100Lavender absolute 15Bergamot oil 70Lemon oil 200Orange oil 10Verbena oil 30Eugenol 25Rose Brugarian oil 5Jasmine absolute 30Rhodinol 30alpha-Hexylcinnamic aldehyde 100Oakmoss absolute 10Vetiver oil 10Patchouli oil 20Musk ketone 70Mugnet base 140Rose base 50Terpinyl acetate 40Labdanum oil 20 975______________________________________

It was noted that addition of 25 parts by weight of 2-exo-hydroxy-endo-tricyclo[6.2.1.0.sup.2,7 ]-undecane according to the invention to the above lavender cologne results in markedly increased greenness and freshness.

Furthermore, the compound according to the invention is very useful in preparing perfumes of the lavandin, bergamot, fougere and chypre types as well as the lavender type.

Claims

1. 2-Exo-hydroxy-endo-tricyclo[6.2.1.0.sup.2,7 ]undecane represented by the following formula (I): ##STR5##