A formal total synthesis of thienamycin from 4-propargyl-2-azetidinone.
作者:ATSUSHI NISHIDA、MASAKATSU SHIBASAKI、SHIRO IKEGAMI
DOI:10.1248/cpb.34.1434
日期:——
A mild and efficient method for the conversion of propiolic esters to β-keto esters was developed. Initially, propiolic esters were converted to β-phenylthio-α, β-unsaturated esters, which were treated with N-bromoacetamide in an aqueous solvent followed by reductive debromination with an aqueous solution of sodium sulfite, affording β-keto esters in good yields. Using this new method, a formal total synthesis of (±)-thienamycin from 4-propargyl-2-azetidinone was accomplished.
研究人员开发了一种温和、高效的方法,用于将丙炔酯转化为 β-酮酯。首先,将丙炔酯转化为 β-苯硫基-α,β-不饱和酯,然后在水性溶剂中用 N-溴乙酰胺处理,再用亚硫酸钠水溶液进行还原脱溴,从而以良好的收率得到 β-酮酯。利用这种新方法,从 4-丙炔基-2-氮杂环丁酮正式全合成了(±)-噻吩霉素。