ALEKPEROV, R. K.;GASANOV, V. S.;GUSEJNOVA, EH. S., AZERB. XIM. ZH., 1985, N 3, 47-48
作者:ALEKPEROV, R. K.、GASANOV, V. S.、GUSEJNOVA, EH. S.
DOI:——
日期:——
Process for preparing 4,4-dialkyl-6-halo-chromans or thiochromans useful
申请人:Allergan, Inc.
公开号:US05420295A1
公开(公告)日:1995-05-30
A process of preparing intermediates useful in making compounds with retinoic acid-like activity is disclosed. The intermediates are halogenated chromans and thiochromans of the formula shown below and are prepared by the alkylation of a phenol or thiophenol with an alkene compound (the starting materials shown in the formula below), cyclization and halogenation. ##STR1## In the formula the symbols have the following meanings: R.sub.1 and R.sub.2 are C.sub.1 to C.sub.4 alkyl, R.sub.3 is H or C.sub.1 to C.sub.4 alkyl, X is oxygen or sulfur, Y is a leaving group, and Z is chlorine, bromine or iodine.