A Highly Stereoselective Addition of Lithiated Ynamides to Ellman–Davis Chiral <i>N-tert</i>-Butanesulfinyl Imines
作者:Xiao-Na Wang、Richard P. Hsung、Rui Qi、Sierra K. Fox、Ming-Can Lv
DOI:10.1021/ol400989x
日期:2013.5.17
A highly diastereoselective addition of lithiated ynamides to Ellman–Davis chiral imines is described. While additions of N-sulfonyl ynamides are highly stereoselective even without Lewis acids, the use of BF3–OEt2 completely reversed the stereoselectivity. In addition, oxazolidinone-substituted ynamides behaved differently and functioned better with BF3–OEt2, and the chirality of the oxazolidinone
描述了将锂化 ynamides 高度非对映选择性地添加到 Ellman-Davis 手性亚胺中。尽管即使没有路易斯酸,N-磺酰基炔酰胺的添加也具有高度立体选择性,但使用 BF 3 –OEt 2完全逆转了立体选择性。此外,恶唑烷酮取代的ynamides表现不同,并且与BF 3 -OEt 2一起发挥更好的作用,并且恶唑烷酮环的手性对选择性没有影响。