Provided herein is a process for the transfer-hydrogenation of ketone analogs of members of the jervine type of
Veratrum
alkaloids, such as cyclopamine. Also provided herein are novel ruthenium transfer-hydrogenation catalysts.
Provided herein is a process for the transfer-hydrogenation of ketone analogs of members of the jervine type of
Veratrum
alkaloids, such as cyclopamine. Also provided herein are novel ruthenium transfer-hydrogenation catalysts.
Efficient desymmetrisation of a meso-imide using a chiral oxazaborolidine catalyst
作者:Rachel A. Dixon、Simon Jones
DOI:10.1016/s0957-4166(02)00248-3
日期:2002.6
Desymmetrisation of a meso-imide by enantioselective reduction using a chiral oxazaborolidine catalyst derived from (1R,2S)-cis-1-amino-2-indanol followed by reduction of the hydroxylactam product proceeded with good enantiomeric excess (80-91%) at significantly lower catalyst loadings compared to reactions using the prolinol-derived catalyst. Models for the selectivity observed are proposed based upon structural probes and experimental observations. (C) 2002 Elsevier Science Ltd. All rights reserved.