Asymmetric Reduction of Ketones Using<i>In Situ</i>Generated Oxazaborolidines From (1<i>R</i>-Camphor as Catalysts
作者:V. Santhi、J. Madhusudana Rao
DOI:10.1080/00397910008087056
日期:2000.12
Abstract Benzyl and 1-naphthyl derivatives of 1,2-amino alcohols derived from (1R)-(+)-camphor were made by a simple and efficient procedure and these were used for the generation of oxazaborolidines with borane. The asymmetricreductions of prochiralketones were carried out using these in situ generated oxazaborolidines as catalysts.
Prochiral dilactone 1 has been synthesized and subjected to diastereo-selective nucleophilic opening. The structural features of chiral, enantiomerically pure nucleophiles have been optimized regarding their capability to perform prochiral recognition at dilactone 1. 3-Ketoglutaric mono acid products 2 of dilactone opening, which are versatile building blocks for natural product synthesis, have been
4-positions in the esterenolate-iminecondensation is studied using different metal enolates of the chiral esters possessing amino alcohols derived all from (+)-camphor as an auxiliary, and 4R- or 4S-β-lactam is obtained in a highly stereoselective manner, respectively. The effects of the structure of the chiral auxiliary and the coordination ability of the heteroatoms in the ester part are also discussed
使用具有全部来自(+)-樟脑的氨基醇的氨基醇的手性酯的不同金属烯醇盐,研究了酯烯醇盐-亚胺缩合中在3-和4-位具有取代基的β-内酰胺在C-4的立体控制,和4 R-或4 S - β-内酰胺分别以高度立体选择性的方式获得。还讨论了手性助剂结构和酯部分杂原子配位能力的影响。
Duden; Macintyre, Chemische Berichte, 1898, vol. 31, p. 1902
作者:Duden、Macintyre
DOI:——
日期:——
Ikota, Nobuo; Sakai, Hiroshi; Shibata, Hisanari, Chemical and pharmaceutical bulletin, 1986, vol. 34, # 3, p. 1050 - 1055