A method for preparing a polyprenyl compound wherein an aldehyde represented by the following general formula [I]:
1
[wherein n represents an integer of from 0 to 3]
and a Wittig reagent represented by the following general formula [II]:
2
[wherein each of R
1
and R
2
represents a group consisting of hydrocarbon] are reacted in a medium as a mixture of water and an organic solvent in the presence of a base, and further in the presence of a crown ether. Said method achieves an excellent selectivity and a high yield.
Method of treating cancerous and precancerous conditions
申请人:Eisai Co., Ltd.
公开号:US04835183A1
公开(公告)日:1989-05-30
An anti-cancer agent which comprises a polyprenvl compound having the formula (I): ##STR1## in which each of n and m is 0, 1 or 2, n+m is 0, 1 or 2, A is ##STR2## and B is ##STR3## in which R represents the hydroxyl group, a lower alkoxy group, or ##STR4## (wherein each of R.sub.1 and R.sub.2 is the hydrogen atom, a lower alkyl group or an aryl group)]; provided that R is a lower alkoxy or ##STR5## if n is 1, m is 0, A is ##STR6## and B is ##STR7##
Conjugated polyprenylcarboxylic acids and their derivatives
申请人:Eisai Co., Ltd.
公开号:US04655973A1
公开(公告)日:1987-04-07
A conjugated polyprenylcarboxylic acid and its derivative having the formula: ##STR1## in which each of n and m is 0, 1 or 2, n+m is 1 or 2, A is ##STR2## and R is the hydroxyl group, a lower alkoxy group or ##STR3## wherein each of R.sub.1 and R.sub.2 represents the hydrogen atom, a lower alkyl group, or an aryl group; provided that R is ##STR4## if A is ##STR5## n is 1 and m is 0.
A novel compound, 3,7,11,15-tetramethyl-2,4,6,10,14-hexadecapentaenoic acid, and a salt thereof are disclosed together with a number of different processes for the preparation of the compound. The uses of the novel compound as an anticancer agent are also disclosed.
A compound, 3,7,11,15-tetramethyl-2,4,6,10,14-hexadecapentaenoic acid, and a salt thereof are disclosed as a therapeutic agent for treatment of skin diseases with keratinization.