A comparison of the Still–Gennari and Ando HWE-methodologies with α,β-unsaturated aldehydes; unexpected results with stannyl substituted systems
作者:Xavier Franci、Sébastien L.X. Martina、John E. McGrady、Michael R. Webb、Craig Donald、Richard J.K. Taylor
DOI:10.1016/j.tetlet.2003.08.095
日期:2003.10
Still-Gennari reactions have been carried out on a range of E- and Z-3-substituted propenals. In all cases, with the exception of Z-3-stannyl systems, good Z-stereoselectivity was observed. By contrast, the Ando procedure gives reasonable Z-stereoselectivity with all systems studied, including those with a cis-disposed stannyl substituent. (C) 2003 Elsevier Ltd. All rights reserved.