Isomer-directed process for producing asymmetric ketones; the products obtained and compositions containing such products
申请人:INTERNATIONAL FLAVORS & FRAGRANCES INC.
公开号:EP0159532A2
公开(公告)日:1985-10-30
Described is an isomer-directed process for producing asymmetric ketones defined according to the generic structure:
wherein one of Z, or Z2 is the moiety:
and the other of Z1 or Z. is hydrogen; wherein R11 and R21 represent hydrogen or the same or different alkyl or alkenyl with the proviso that R11 and R21 are not both hydrogen or wherein R11 and R21 taken together:
(i) complete a cycloalkyl, cycloalkenyl, bicycloalkyl, mono or polyalkyl cycloalkyl or mono or polyalkyl cycloalkenyl ring, or
(ii) represent alkylidene, cycloalkenyl alkylidene, aralkylidene, mono or polyalkyl cycloalkenyl alkylidene or mono or polyalkyl aralkylidene;
and wherein R., R7 and R8 are the same or different and each represents hydrogen or methyl, using a catalytic Claisen rearrangement of allylic ethers previously formed by reacting substituted or unsubstituted allylic alcohols defined according to the structure:
with dialkyl ketals defined according to the structure:
(Continuation next page) wherein R4 and R5 represent the same or different C1-C4 alkyl.
Also described are compounds and processes for using same in perfumery defined according the structures:
Also described are certain diallylic ethers defined according to the generic structure:
描述了一种异构体定向工艺,用于生产根据通用结构定义的不对称酮:
其中 Z 或 Z2 之一为分子:
其中R11和R21代表氢或相同或不同的烷基或烯基,但R11和R21不能都是氢或R11和R21合在一起:
(i) 构成环烷基、环烯基、双环烷基、单烷基或多烷基环烷基或单烷基或多烷基环烯 基环,或
(ii) 代表亚烷基、亚环烯基、亚芳基、单或多烷基环烯基或单或多烷基亚芳基;
其中 R.、R7 和 R8 是相同或不同的,并且各自代表氢或甲基,使用催化克莱森重排法,将先前通过与根据结构定义的取代或未取代的烯丙基醇反应而形成的烯丙基醚与根据结构定义的二烷基酮反应:
与按以下结构定义的二烷基酮反应生成的烯丙基醚:
(下页接续) 其中 R4 和 R5 代表相同或不同的 C1-C4 烷基。
还描述了根据以下结构定义的化合物和将其用于香水的工艺:
还描述了根据通用结构定义的某些二烯丙基醚: