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%
氯磺酰基异氰酸酯与t- BuOH,t- BuNH 2和TFA的顺序反应允许形成H 2 NSO 2 NHBu t。后者在Ti(OEt)4存在下与Ar 1 CHO缩合可提供活化的亚胺Ar 1 CHNSO 2 NHBu t(59-89%)。使用现成的二烯配体,可商购获得的硼酸以良好的立体选择性(76-98%ee)加到这些亚胺上。用在吡啶中的5%w / w水简单脱保护得到游离的Ar 1 CHNH 2 Ar 2。