Alkylation of Chiral, Phosphorus-Stabilized Carbanions: Substituent Effects on the Alkylation Selectivity
摘要:
The alkylation of a series of enantiomerically pure cis and trans 3-substituted 2-benzyl-6-methyl-1,3,2-oxazaphosphorinane 2-oxides was found to be sensitive to the bulk of the N-substituents.
Alkylation of Chiral, Phosphorus-Stabilized Carbanions: Substituent Effects on the Alkylation Selectivity
摘要:
The alkylation of a series of enantiomerically pure cis and trans 3-substituted 2-benzyl-6-methyl-1,3,2-oxazaphosphorinane 2-oxides was found to be sensitive to the bulk of the N-substituents.
Asymmetric electrophilic amination of chiral phosphorus-stabilized anions
作者:Scott E. Denmark、Naoto Chatani、Sunil V. Pansare
DOI:10.1016/s0040-4020(01)88883-9
日期:1992.1
The asymmetric electrophilicamination of phosphorus-stabilized anions derived from chiral oxazaphosphorinanes and diazaphospholidines is described. Trisyl azide is the reagent of choice for the amination process. The reaction is shown to be dependent on auxiliary structure, nature of the P-alkyl substituent and choice of amination procedure. Using the oxazaphosphorinanes 1a and cis-1e a high level