Regioselective Cobalt-Catalysed Hydrovinylation for the Synthesis of Non-Conjugated Enones and 1,4-Diketones
作者:Laura Kersten、Gerhard Hilt
DOI:10.1002/adsc.201100800
日期:2012.3.16
The highly regioselective cobalt‐catalysed 1,4‐hydrovinylation of terminal alkenes with 2‐trimethylsilyloxy‐1,3‐butadiene generates in a stereospecific fashion unsaturated E‐configured silyl enol ether intermediates that are suitable for diastereoselective Mukaiyama‐aldol reactions with bulky aliphatic aldehydes. The acidic hydrolysis of the enol ethers to γ,δ‐unsaturated ketones followed by ozonolysis
高度区域选择性的钴催化的末端烯烃与2-三甲基甲硅烷氧基-1,3-丁二烯的1,4-氢乙烯基化以立体定向方式生成不饱和E-构型的甲硅烷基烯醇醚中间体,适用于与大体积脂族醛的非对映选择性Mukaiyama-aldol反应。烯醇醚的酸性水解为γ,δ-不饱和酮,然后进行臭氧分解,可用于合成各种1,4-二酮和多羰基衍生物。1,4-二酮和多羰基衍生物已成功测试了一些单吡咯和双吡咯衍生物的合成。γ,δ-不饱和酮是有用的结构单元(例如,在天然产物合成中),可以一锅法生成。