申请人:Pfizer Inc.
公开号:US04782165A1
公开(公告)日:1988-11-01
In the synthesis of biotin and decarboxybiotin, a more direct method for the conversion of 1,3-diacyl-4-(bromomethyl)-5-[(5-alkoxycarbonylpentanoyl) or hexanoyl]-4-imidazolin-2-ones to 1,3-diacyl-4-[(4-alkoxybutanoyl) or pentanoyl]-1H,3H-thieno (3,4-b)imidazol-2-one via the Bunte salt of the formula ##STR1## wherein R is (C.sub.1 -C.sub.5)alkanoyl or (C.sub.2 -C.sub.5) alkoxycarbonyl, X is methyl or (C.sub.2 -C.sub.5)alkoxycarbonyl an Y is an alkali metal.
在生物素和去羧基生物素的合成中,一种更直接的方法是通过Bunte盐的转化,将1,3-二酰基-4-(溴甲基)-5-[(5-烷氧羰基戊酰基)或己酰基]-4-咪唑烷-2-酮转化为1,3-二酰基-4-[(4-烷氧基丁酰基)或戊酰基]-1H,3H-噻吩(3,4-b)咪唑-2-酮。其中Bunte盐的公式为##STR1##其中R为(C.sub.1-C.sub.5)烷酰基或(C.sub.2-C.sub.5)烷氧羰基,X为甲基或(C.sub.2-C.sub.5)烷氧羰基,Y为碱金属。