A chiral key intermediate (19a) for the synthesis of (+)-thienamycin was synthesized starting from D-glucose. The enol ether 13, obtained from the ketone 11 by Horner-Wittig reaction, was transformed to the corresponding methyl ester 16 by pyridinium chlorochromate oxidation or by employing the Wacker process. The ester 16 was further converted to the β-lactam 19a, which is a useful chiral precursor to (+)-thienamycin.
以
D-葡萄糖为起始原料,合成了用于合成(+)-
硫霉素的立体关键中间体(19a)。通过Horner-Wittig反应从酮11获得的烯醇醚13,经
吡啶氯铬酸氧化或采用Wacker工艺转化为相应的甲酯16。进一步将酯16转化为β-内酰胺19a,它是合成(+)-
硫霉素的有用手性前体。