Synthesis of Phosphoramides for the Lewis Base-Catalyzed Allylation and Aldol Addition Reactions
作者:Scott E. Denmark、Xiping Su、Yutaka Nishigaichi、Diane M. Coe、Ken-Tsung Wong、Stephen B. D. Winter、Jun Young Choi
DOI:10.1021/jo9820723
日期:1999.3.1
Both chiral and achiral phosphoramides of diverse structure were prepared from diamines by the coupling to phosphorus(V) or phosphorus(III) reagents. Several enantiopure 1,2-diphenyl-1,2-ethanediamine analogues have been prepared by the reductive coupling of the corresponding N-silylimine with NbCl(4)(THF)(2) and subsequent resolution by the formation of diastereomeric menthyl carbamates. (S,S)-N,
Chiral Phosphoramide-Catalyzed Enantioselective Addition of Allylic Trichlorosilanes to Aldehydes. Preparative and Mechanistic Studies with Monodentate Phosphorus-Based Amides
作者:Scott E. Denmark、Jiping Fu、Diane M. Coe、Xiping Su、Norman E. Pratt、Brian D. Griedel
DOI:10.1021/jo052202p
日期:2006.2.1
to benzaldehyde promoted by chiral phosphoramides to give the enantioenriched homoallylicalcohol has been investigated. In a survey of Lewis bases as activators for the addition of allyltrichlorosilane to benzaldehyde, phosphorus-based amides have been found to be the most effective promoters. To achieve asymmetric induction, chiral phosphoric triamides derived from chiral diamines have been developed