Organic compounds -- part of the class 532-570 series – Organic compounds – Cyclohexadiene having atoms double bonded directly at the 1-...
Patent
1996-07-26
1997-10-14
Cook, Rebecca
Organic compounds -- part of the class 532-570 series
Organic compounds
Cyclohexadiene having atoms double bonded directly at the 1-...
C07C 5012
Patent
active
056774710
ABSTRACT:
Disclosed herein are a quinone derivative represented by the following formula: ##STR1## wherein R.sup.1 and R.sup.2 are identical with or different from each other and mean individually a lower alkyl or lower alkoxy group, or may form an aromatic ring together, R.sup.3 denotes a lower alkyl group, n stands for 0 or an integer of 1-9, and a linkage--is a single or double bond, such as a vitamin K derivative or coenzyme Q derivative; and a process for the preparation of the quinone derivative at a high yield without forming any geometric isomer; as well as a 1,4,4.sub.a,8.sub.a -tetrahydro-4.sub.a .alpha.-alkenyl-1.alpha.,4.alpha.-methanonaphthalene-5,8-dione derivative which is useful as an intermediate for the preparation of the quinone derivative.
REFERENCES:
patent: 4603223 (1986-07-01), Ruttimann et al.
patent: 4853156 (1989-08-01), Ruttimann et al.
Hamamura Kimio
Iwama Tetsuo
Konishi Masayuki
Seki Chiaki
Cook Rebecca
Eisai Chemical Co., Ltd.
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