Asymmetric Synthesis of Polysubstituted 4-Amino- and 3,4-Diaminochromanes with a Chiral Multifunctional Organocatalyst
作者:Wenduan Hou、Bo Zheng、Jun Chen、Yungui Peng
DOI:10.1021/ol300798t
日期:2012.5.4
A series of multifunctional catalysts with two chiral diaminocyclohexane units were developed and successfully applied in the asymmetricoxa-Michael–aza-Henrycascadereaction of salicylaldimines with nitroolefins. This approach provides a simple and efficient entry to polysubstituted chiral 4-aminobenzopyrans with three consecutive stereocenters and in high yield (up to 97%) with excellent stereoselectivity
The expedient synthesis of a novel chiral (1S,2S)-N-[(2-isothiocyanato)cyclohexyl] trifluoromethanesulfonamide and its use as a derivatizing auxiliary for the straightforward determination of optical purity of chiral amines are reported.