Asymmetric Synthesis of Aminocyclopropanes and<i>N</i>-Cyclopropylamino Alcohols Through Direct Amidocyclopropanation of Alkenes Using Chiral Organozinc Carbenoids
作者:Guillaume Bégis、David E. Cladingboel、Laure Jerome、William B. Motherwell、Tom D. Sheppard
DOI:10.1002/ejoc.200801033
日期:2009.4
Chiral N-(diethoxymethyl)oxazolidinones, prepared from the corresponding oxazolidinones by heating in triethyl orthoformate can he used as organozinc carbenoid precursors for the direct enantioselective amidocyclopropanation of alkenes. The reaction is successful with it wide range of oxazolidinones and alkenes and proceeds with moderate to excellent, yield and stereoselectivity. In most cases the
通过在原甲酸三乙酯中加热由相应的恶唑烷酮制备的手性 N-(二乙氧基甲基)恶唑烷酮可用作烯烃的直接对映选择性酰氨基环丙烷化的有机锌卡宾前体。该反应在广泛的恶唑烷酮和烯烃下成功,并以中等至极好的收率和立体选择性进行。在大多数情况下,反式/外置酰氨基-环丙烷产物是有利的,尽管某些环状烯烃如茚有利于内环丙烷的形成。这些产品可以很容易地加工成环丙氨基醇和氨基酸。((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)