A new reagent for the preparation of chiral HMGA (3-hydroxy-3-methylglutaric acid) esters and amides. Synthesis of (R)- and (S)-β-carboxymethyl-β-methyl-β-lactones by asymmetric desymmetrization of HMGA anhydride
作者:Kimiko Hashimoto、Jun-ichi Kitaguchi、Yasuhiro Mizuno、Tadao Kobayashi、Haruhisa Shirahama
DOI:10.1016/0040-4039(96)00274-2
日期:1996.3
(R)- and (S)-β-carboxymethyl-β-methyl-β-lactones, new reagents for the preparation of chiral HMGA (3-hydroxy-3-methylglutaric acid) esters and amides were developed through the asymmetric desymmetrization of HMGA anhydride. The reagent was smoothly reacted with various alkoxide without racemization to afford the desirable half-esters. On the other hand, the reaction with various amine in refluxing
(R)-和(S)-β-羧甲基-β-甲基-β-内酯通过HMGA的不对称脱对称作用开发了用于制备手性HMGA(3-羟基-3-甲基戊二酸)酯和酰胺的新试剂酐。使试剂与各种醇盐平稳反应,而无需外消旋作用,得到所需的半酯。另一方面,在回流的甲苯中与各种胺的反应得到外消旋酰胺。使用试剂的相应甲酯制备了手性HMGA酰胺。