作者:Jeffrey S. Cannon、Stefan F. Kirsch、Larry E. Overman
DOI:10.1021/ja106685w
日期:2010.11.3
A broadly useful catalytic enantioselective synthesis of branched allylic esters from prochiral (Z)-2-alkene-1-ols has been developed. The starting allylic alcohol is converted to its trichloroacetimidate intermediate by reaction with trichloroacetonitrile, either in situ or in a separate step, and this intermediate undergoes clean enantioselective S(N)2' substitution with a variety of carboxylic acids
已经开发了一种广泛有用的催化对映选择性合成从前手性 (Z)-2-烯烃-1-醇的支链烯丙酯。起始烯丙醇通过与三氯乙腈反应,在原位或在单独的步骤中转化为其三氯乙酰亚胺中间体,并且该中间体在钯的存在下用各种羧酸进行干净的对映选择性 S(N)2' 取代( II)催化剂(R(p),S)-di-μ-乙酰基双[(η(5)-2-(2'-(4'-甲基乙基)恶唑啉基)环戊二烯基-1-C,3'-N)( η(4)-四苯基环丁二烯)钴]二钯,(R(p),S)-[COP-OAc](2),或其对映异构体。定义了这种有用的催化不对称烯丙基酯化的范围和限制。