Synthesis of Enantiopure 1-Aryl-1-butylamines and 1-Aryl-3-butenylamines by Diastereoselective Addition of Allylzinc Bromide to Imines Derived from (R)-Phenylglycine Amide
作者:Jan Dalmolen、Marcel van der Sluis、José W. Nieuwenhuijzen、Auke Meetsma、Ben de Lange、Bernard Kaptein、Richard M. Kellogg、Quirinus B. Broxterman
DOI:10.1002/ejoc.200300662
日期:2004.4
The highlydiastereoselective addition of allylzinc bromide to imines derivedfrom (R)-phenylglycine amide is reported. Homoallylamines with high enantiomeric purity are obtained from the adducts in three steps on removal of the chiralauxiliary by means of a nonreductive protocol. Removal of the auxiliary by hydrogenation leads to the saturated amines, also in high enantiomeric purity. [reaction: see
Enantioselective Synthesis of Angularly Substituted 1-Azabicylic Rings: Coupled Dynamic Kinetic Epimerization and Chirality Transfer
作者:Zachary D. Aron、Tatsuya Ito、Tricia L. May、Larry E. Overman、Jocelyn Wang
DOI:10.1021/jo4018099
日期:2013.10.4
A new strategy for enantioselective synthesis of azacyclic molecules in which dynamickinetic equilibration of diastereomeric iminium ions precedes a stereochemistry-determining sigmatropic rearrangement is reported. The method is illustrated by the synthesis, in high enantiomeric purity (generally 95–99% ee), of a variety of 1-azabicyclic molecules containing angular allyl or 3-substituted 2-propenyl