Total Synthesis of the Hydroxyketone Kurasoin A Using Asymmetric Phase-Transfer Alkylation
作者:Merritt B. Andrus、Erik J. Hicken、Jeffrey C. Stephens、D. Karl Bedke
DOI:10.1021/jo061395t
日期:2006.10.1
The total synthesis of the farnesyltransferase inhibitor kurasoin A has been achieved using a novel asymmetric phase-transfer-catalyzed glycolate alkylation reaction. 2,5-Dimethoxyacetophenone 7 with cinchonidinium catalyst 9 (10 mol %) and hydroxide base with pivaloyl benzyl bromide 8 provided S-alkylation product 10 in high yield (80−99%) and excellent enantioselectivity. Baeyer−Villiger oxidation
使用新颖的不对称相转移催化的乙醇酸酯烷基化反应已实现了法呢基转移酶抑制剂苦参素A的全合成。2,5-二甲氧基苯乙酮7与金鸡尼丁催化剂9(10摩尔%)和氢氧化碱与新戊酰苄基溴8只要S -烷基化产物10以高收率(80-99%)和优异的对映选择性。TES-醚17的Baeyer-Villiger氧化,Weinreb酰胺形成和苄基格氏试剂产生了受保护的靶标。氢氧化锂和过氧化物可生成苦参素A([α] D + 8.4°),而不会异构化。