Claims
- 1. Compounds of formula IV ##STR40## wherein R.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.3 -C.sub.6 cycloalkyl, C.sub.1 -C.sub.4 alkoxy-C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.2 haloalkyl, phenyl, benzyl, phenethyl, phenpropyl, phenbutyl or phenpentyl, or a phenyl, benzyl, phenethyl, phenpropyl, phenbutyl or phenpentyl radical that is mono- or di-substituted by halogen, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.2 haloalkyl, methoxy and/or by ethoxy,
- R.sub.2 is hydrogen, C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl, or is phenyl that is unsubstituted or substituted by C.sub.1 -C.sub.12 alkyl, halogen or by C.sub.1 -C.sub.12 haloalkyl, or R.sub.1 and R.sub.2 together form a saturated or unsaturated 3- to 7-membered carbocycle, and
- R.sub.3 is hydrogen or C.sub.1 -C.sub.6 alkyl.
- 2. Compounds of formula IV according to claim 1, wherein R.sub.1 is hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.5 cycloalkyl, phenyl or phenyl that is mono- or di-substituted by halogen, C.sub.1 -C.sub.3 alkyl, methoxy or by ethoxy; and each of R.sub.2 and R.sub.3 is hydrogen or C.sub.1 -C.sub.4 alkyl.
- 3. Compounds of formula IV according to claim 2, wherein R.sub.1 is hydrogen, C.sub.1 -C.sub.4 alkyl or cyclopropyl; R.sub.2 is hydrogen, methyl or ethyl; and R.sub.3 is hydrogen or methyl.
- 4. The compounds according to claim 3 of formulae ##STR41##
Priority Claims (1)
Number |
Date |
Country |
Kind |
4062/87 |
Oct 1987 |
CHX |
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Parent Case Info
This is a divisional of application Ser. No. 255,684 filed on Oct. 11, 1988 now U.S. Pat. No. 4,931,439.
Foreign Referenced Citations (1)
Number |
Date |
Country |
1795785 |
Aug 1975 |
DEX |
Non-Patent Literature Citations (1)
Entry |
A. Hetzhein et al., Liebigs Ann. Chem., vol. 749, pp. 125-133 (1971). |
Divisions (1)
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Number |
Date |
Country |
Parent |
255684 |
Oct 1988 |
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