申请人:International Flavors & Fragrances Inc.
公开号:US04412083A1
公开(公告)日:1983-10-25
Described is a process for preparing solanone and norsolanadione using chemical intermediates defined according to the generic structure: ##STR1## wherein X is one of the moieties: ##STR2## wherein R represents hydrogen or methyl; wherein Y represents one of the structures: ##STR3## wherein one of the dashed lines represents a carbon-carbon single bond and the other of the dashed lines represents a carbon-carbon double bond; with the provisos that: (i) when Y is the moiety having the structure: ##STR4## then X is the moiety having the structure: ##STR5## (ii) when X is the moiety having the structure: ##STR6## then Y is the moiety having the structure: --C.tbd.N] In preparing solanone, the compound having the structure: ##STR7## or a mixture of compounds defined according to the structure: ##STR8## is reacted with methyl lithium and the resulting intermediate is hydrolyzed and the resulting compound is dehydrated. In producing the norsolanadione, the compound having the structure: ##STR9## or a mixture of compounds according to the structure: ##STR10## is reacted with ethylene glycol or propylene glycol thereby forming a ketal and the resulting ketal is reacted with methyl lithium and the resulting intermediate is then hydrolyzed in the presence of acid.
本文描述了一种使用化学中间体制备Solanone和Norsolanadione的方法,该中间体的通用结构如下:##STR1## 其中X是以下其中一种结构:##STR2## 其中R代表氢或甲基;其中Y是以下其中一种结构:##STR3## 其中虚线之一表示碳-碳单键,另一条虚线表示碳-碳双键;但有以下限制:(i)当Y是具有以下结构的基团时:##STR4## 那么X是具有以下结构的基团:##STR5## (ii)当X是具有以下结构的基团时:##STR6## 那么Y是具有以下结构的基团:--C≡N] 在制备Solanone时,具有以下结构的化合物:##STR7## 或根据以下结构定义的化合物混合物:##STR8## 与甲基锂反应,得到中间体,然后水解并脱水得到目标化合物。在制备Norsolanadione时,具有以下结构的化合物:##STR9## 或根据以下结构定义的化合物混合物:##STR10## 与乙二醇或丙二醇反应,形成缩酮,然后与甲基锂反应,得到中间体,然后在酸的存在下水解得到目标化合物。