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.
Based on different chiral diamine skeletons, a series of bifunctional primary amine-thiophosphoramides were synthesized and screened as the catalysts for the asymmetric Michael addition of acetone to both aromatic and aliphatic nitroolefins. Under the catalysis of a thiophosphoramide derived from 1,2-diphenylethane-1,2-diamine, the corresponding adducts were obtained in high yields (up to >99%) with
The Catalytic Asymmetric Addition of Diethylzinc toN-(Diphenylphosphinoyl) Imines Catalyzed by Cu(OTf)2-ChiralN-(Binaphthyl-2-yl)thiophosphoramide Ligands
作者:Min Shi、Chun-Jiang Wang
DOI:10.1002/adsc.200303041
日期:2003.8
Chiral N-(binaphthyl-2-yl)thiophosphoramide L7 [O,O-diethyl 2′-(ethylamino)-1,1′-binaphthyl-2-ylamidothiophosphate] prepared from the reaction of diethyl chlorothiophosphate with (R)-(+)-N-ethyl-1,1′-binaphthyl-2,2′-diamine was used as a catalytic chiral ligand in the first Cu(OTf)2-promoted catalyticasymmetricaddition of diethylzinc to N-(diphenylphosphinoyl) imines in which ~85% ee can be realized
Chiral diphenylthiophosphoramides: a new class of chiral ligands for the silver(I)-promoted enantioselective allylation of aldehydes
作者:Min Shi、Wen-Sheng Sui
DOI:10.1016/s0957-4166(99)00580-7
日期:2000.2
Chiral C-2-symmetric diphenylthiophosphoramides 1 and 2 were prepared in high yields from the reaction of diphenylthiophosphinic chloride with (1R,2R)-(-)-1,2-diaminocyclohexane and (1R,2R)-(+)- 1,2-diphenylethylenediamine, respectively. Another novel chiral ligand 4 was prepared from reaction of diphenylthiophosphinic chloride with (R)-(+)-1,1'-binaphthyl-2,2'-diamine using butyllithium as a base. They were used as catalytic chiral ligands in the silver(I)-promoted enantioselective allylation reaction of aldehydes with allyltributyltin. (C) 2000 Elsevier Science Ltd. All rights reserved.
Chiral Binaphthylthiophosphoramide−Cu(I)-Catalyzed Asymmetric Addition of Diethylzinc to <i>N</i>-Sulfonylimines
作者:Chun-Jiang Wang、Min Shi
DOI:10.1021/jo034269n
日期:2003.8.1
In the presence of a catalytic amount of chiral binaphthylthiophosphoramide L2 (6 mol %) and Cu(I) (3 mol %), the asymmetric addition of diethylzinc to N-sulfonylimines could be achieved in good yields with moderate to high ee (63-93% ee) at 0 degreesC in toluene. A novel chiral binaphthylthiophosphoramide ligand system for this asymmetric addition reaction has been explored.