V for resolution: A new oxovanadium catalyst (V‐MPS; see scheme) immobilized in the pores of mesoporous silica has been developed. The combined use of V‐MPS and lipases achieved the dynamickineticresolution of a wide range of racemic alcohols (1 or 2) to produce optically active esters 3 in high chemical and optical yields. The paired catalysts retained high catalytic activity when reused up to six
Asymmetric Allylboration of α,β-Enals as a Surrogate for the Enantioselective Synthesis of Allylic Amines and α-Amino Acids
作者:P. Veeraraghavan Ramachandran、Thomas E. Burghardt、M. Venkat Ram Reddy
DOI:10.1021/jo048144+
日期:2005.3.1
Optically pure allylic amines have been synthesized from α,β-unsaturated aldehydes via allylboration with (−)-B-allyldiisopinocampheylborane, followed by Overman rearrangement. By incorporating crotyl and alkoxyallylboration, functionalization at δ-position was readily accomplished. By applying this methodology, the synthesis of several chiral α-amino acids has been achieved.