The development of biomimetic chemistry based on the NAD(P)H with hydrogen gas as terminal reductant is a long‐standing challenge. Through rational design of the chiral and regenerable NAD(P)H analogues based on planar‐chiral ferrocene, a biomimetic asymmetric reduction has been realized using bench‐stable Lewis acids as transfer catalysts. A broad set of alkenes and imines could be reduced with up
Asymmetric conjugate additions to 1,1′-diactivated cyclic enones—a comparative study
作者:Xiaoping Tang、Alexander J. Blake、William Lewis、Simon Woodward
DOI:10.1016/j.tetasy.2009.07.006
日期:2009.8
A study of copper-phosphoramidite-catalysed ZnR2 and AlR3 additions to 1,1'-dicarbonyl-activated cyclic Michael acceptors has revealed high enantioselectivities for AlR3 (R = Me, Et) 1,4-addition to a range of 3-acylcoumarins (85-98% ee, trans:cis similar to 90:10) using commercial OF readily available ligands. Large substituents at the 6-position, and to some extent at the 5-position, of the coumarin are less well tolerated, nor is truncation of the coumarin motif to a comparable 2-acylcyclohexenone (ee values up to 78%). (C) 2009 Elsevier Ltd. All rights reserved.
PATRA, AMARENDRA;MISRA, SWAPAN K., INDIAN J. CHEM. B., 27,(1988) N 3, C. 272-273