High-Pressure Enantioselective Allylation of Aldehydes Catalyzed by (Salen)Chromium(III) Complexes
作者:Janusz Jurczak、Piotr Kwiatkowski
DOI:10.1055/s-2004-836067
日期:——
The enantioselective addition of allyltributyltin to simple aldehydes (2a-1), catalyzed by chiral (salen)Cr(III) complexes 1, has been studied. The reaction proceeds smoothly with low loading (1-2 mol%) of (salen)Cr(III)BF 4 (la) and allyltributyltin under high-pressure conditions (10 kbar) in good yield and ee values in the range of 35-79%.
Enantioselective allylation of aldehydes catalyzed by chiral indium(iii) complexes immobilized in ionic liquids
作者:Jun Lu、Shun-Jun Ji、Teck-Peng Loh
DOI:10.1039/b500086f
日期:——
In the presence of chiral catalytic complexes prepared from In(OTf)3 and chiral PYBOX ligands, allytributylstannane reacted with aldehydes in ionic liquids to afford the corresponding homoallylic alcohols in high enantioselectivities (86–94% ee) and good yields (68–89%); the chiral catalysts immobilized in ionic liquids could be reused with comparable enantioselectivities and yields.
Highly Enantioselective Allylation of Aldehydes Catalyzed by Indium(III)−PYBOX Complex
作者:Jun Lu、Shun-Jun Ji、Yong-Chua Teo、Teck-Peng Loh
DOI:10.1021/ol047711c
日期:2005.1.1
A chiral indium(III)-PYBOX complex prepared from indium triflate and chiral PYBOX has been discovered to effect high enantioselectivities in the addition of allyltributyl stannane to aldehydes. The allylation of a variety of aromatic, alpha,beta-unsaturated, and aliphatic aldehydes resulted in good yields and high enantioselectivities (up to 94% ee).