N-(Alkylsulfamoyl)aldimines: easily deprotected precursors for diarylmethylamine synthesis
作者:Rosemary H. Crampton、Martin Fox、Simon Woodward
DOI:10.1016/j.tetasy.2013.04.006
日期:2013.5
The sequential reaction of chlorosulfonyl isocyanate with t-BuOH, t-BuNH2 and TFA allows formation of H2NSO2NHBut. Condensation of the latter with Ar1CHO in the presence of Ti(OEt)4 provides the activated imines Ar1CHNSO2NHBut (59–89%). Commercially available boronic acids add to these imines with good stereoselectivity (76–98% ee) using readily available diene ligands. Simple deprotection with 5%