Studies on highly regio- and stereoselective selenohydroxylation reaction of 1,2-allenyl phosphine oxides with PhSeCl
作者:Guangke He、Hao Guo、Rong Qian、Yinlong Guo、Chunling Fu、Shengming Ma
DOI:10.1016/j.tet.2009.04.023
日期:2009.6
The selenohydroxylation of readily available 1,2-allenyl phosphine oxides with PhSeCl in MeCN/H2O afforded 3-hydroxy-2-phenylselanyl-1(E)-alkenyl diphenyl phosphine oxides in good yields with very high regio- and stereoselectivities including the high efficiency of the axial chirality transfer. The E-stereoselectivity is believed to be determined by the neighboring group participation effect of the diphenyl phosphine oxide functionality. (C) 2009 Elsevier Ltd. All rights reserved.
Neighboring Group Participation of Phosphine Oxide Functionality in the Highly Regio- and Stereoselective Iodohydroxylation of 1,2-Allenylic Diphenyl Phosphine Oxides
作者:Hao Guo、Rong Qian、Yinlong Guo、Shengming Ma
DOI:10.1021/jo8013462
日期:2008.10.17
iodohydroxylation of 1,2-allenylic diphenyl phosphine oxides, yielding (E)-2-iodo-3-hydroxy-1-alkenyl diphenyl phosphine oxides with very high stereoselectivity. The scope of this reaction was examined extensively. Notably, studies on the reactivity of optically active substrates indicated that the axial chirality in the starting allenes may be efficiently transferred to the center chirality of the