Chiral linker. Part 4: Diastereoselective addition of RZnX to α-keto esters using m-hydrobenzoin derived chiral auxiliaries in solution and on solid support and their application in the stereoselective synthesis of frontalin
摘要:
Two recently reported, m-hydrobenzoin derived open chain chiral auxiliaries, which were developed for application in either solution or immobilized on a solid support, were tested in the diastereoselective addition of RZnX to their corresponding phenylglyoxylates and pyruvates, respectively, resulting in diastereoisomeric excesses of up to > 98% de. The optimized procedure was applied in the stereoselective synthesis of frontalin, the aggregation pheromone of pine bark beetles of the Dendroctonus family, by the use of both the solution phase and the polymer supported chiral auxiliary. (c) 2006 Elsevier Ltd. All rights reserved.
Asymmetric synthesis based on chiral diamines having pyrrolidine ring
作者:Teruaki Mukaiyama
DOI:10.1016/s0040-4020(01)93286-7
日期:——
Various highly stereoselective asymmetric reactions based on chiral diamines having pyrrolidine ring are described. Some of these reactions have been successfully applied to the syntheses of natural products.
ASYMMETRIC SYNTHESIS OF TWO ENANTIOMERS OF FRONTALIN
作者:Yoji Sakito、Teruaki Mukaiyama
DOI:10.1246/cl.1979.1027
日期:1979.8.5
(S)-Frontalin and its antipode were separately synthesized in good yields from (S)- and (R)-2-hydroxy-2,6-dimethyl-6-heptenal, which were prepared in high optical yields by an asymmetric synthesis using (S)- 2-(anilinomethyl)pyrrolidine as a chiral auxiliary.
Enantiomerically pure acetals in organic synthesis. 2. Diastereoselective alkylation of enantiomeric lithio alkyl lactyl tetrahydropyranosides and related enolates
作者:Eugene A. Mash、James A. Fryling
DOI:10.1021/jo00003a035
日期:1991.2
A concise approach for the rapid synthesis of enantiomerically pure alpha-alkylated derivatives of lactate esters and of other enantiomerically pure alpha-hydroxy esters is presented. This methodology, which makes use of enantiomeric lithium enolates prepared from diastereomeric tetrahydropyranyl ethers derived from alkyl lactates and other alpha-hydroxy esters, is used to prepare both enantiomers of frontalin from (S)-(-)-methyl lactate.
MASH, EUGENE A.;FRYLING, JAMES A., J. ORG. CHEM., 56,(1991) N, C. 1094-1098