作者:Hai T. Dao、Chao Li、Quentin Michaudel、Brad D. Maxwell、Phil S. Baran
DOI:10.1021/jacs.5b05144
日期:2015.7.1
problem of olefin hydromethylation is presented. This highly chemoselective method can tolerate labile and reactive chemical functionalities and uses a simple set of reagents. An array of olefins, including mono-, di-, and trisubstituted olefins, are all smoothly hydromethylated. This mild protocol can be used to simplify the synthesis of a specific target or to directly “edit” complex natural products
2-chloro-alkanoic acids 6 and 7 have been obtained the diastereoselective halogenation of chiralsilylketeneacetals 3a-f, and subsequent saponification of the resulting crude esters. Examples characterized by e.e. values up to 95% are reported. The diastereoface selectivity is independent of the silylketeneacetal configuration.