Indium-mediated Barbier-type allylation of aldehydes as a convenient method for the highly enantioselective synthesis of homoallylic alcohols
作者:Lacie C. Hirayama、Soya Gamsey、Daniel Knueppel、Derek Steiner、Kelly DeLaTorre、Bakthan Singaram
DOI:10.1016/j.tetlet.2005.01.169
日期:2005.3
enantioselective allylation of both aromatic and aliphatic aldehydes using commercially available (1S,2R)-(+)-2-amino-1,2-diphenylethanol as a chiral auxiliary. Using only two equivalents of allyl bromide, excellent yields and very good to excellent enantioselectivities are obtained. To our knowledge, the enantioselectivities reported herein are the highest obtained for indium-promoted allylations of carbonyl
The reaction of (Phebox)SnMe3 1 [PheboxH = 2,6-bis(oxazolinyl)benzene] and [(c-octene)RhCl]2 in the presence of CCl4 provided air-stable and water-tolerant (Phebox)RhCl2(H2O) complexes 2 which acted as asymmetric catalysts for the enantioselective allylation of aldehydes in up to 80% ee.
Highly Enantioselective Allylation of Arylaldehydes Catalyzed by a Silver(I)-Chiral Binaphthylthiophosphoramide
作者:Chun-Jiang Wang、Min Shi
DOI:10.1002/ejoc.200300099
日期:2003.8
diphenylthiophosphoramide L2 prepared from diphenylthiophosphinic chloride and ?-(+)-N-ethyl-1,1'-binaphthyl-2,2'-diamine 2 was used as a catalytic chiral ligand in the siver(I)-catalyzed enantioselectiveallylation reaction of arylaldehydes with allyltribuyltin to furnish high ee (up to 98%) of the homoallylic alcohols.
Chiral Bis(imidazolinyl)phenyl NCN Pincer Rhodium(III) Catalysts for Enantioselective Allylation of Aldehydes and Carbonyl–Ene Reaction of Trifluoropyruvates
作者:Tao Wang、Xin-Qi Hao、Juan-Juan Huang、Jun-Long Niu、Jun-Fang Gong、Mao-Ping Song
DOI:10.1021/jo4014194
日期:2013.9.6
Chiral NCN pincer rhodium(III) complexes with bis(imidazolinyl)phenyl ligands were found to be effective catalysts for the allylation of a variety of electronically and structurally diverse aldehydes with allyltributyltin, giving the corresponding optically active homoallylic alcohols in high yields with enantioselectivities of up to 97% ee. These complexes were also applied in the carbonyl–ene reaction
A series of unsymmetricallysubstituted diastereoisomeric (Ra,R) and (Sa,R) bipyridine N,N′‐dioxides were tested as catalysts for the enantioselective allylation of various aldehydes. Homoallylic alcohols were obtained with enantiopurities of up to 99 % ee.