An asymmetric synthesis of synthetic intermediates to thienamycin and epithienamycins A and B
作者:Tetsuji Kametani、Takayasu Nagahara、Masataka Ihara
DOI:10.1039/p19810003048
日期:——
An asymmetric synthesis for the synthetic intermediates to carbapenem antibiotics was examined via isoxazoline derivatives prepared by 1,3-dipolar cycloaddition between the nitrile oxide and menthyl crotonate. The (4S)-trans-azetidinone (14) having the antipodal configuration of thienamycin was synthesised in 16–20% e.e., while 85.3% e.e. of the (4R)-cis-azetidinone, possessing the same absolute configuration
碳青霉烯类抗生素的合成中间体的不对称合成是通过异恶唑啉衍生物进行检查的,该衍生物是通过在腈和丁烯酸薄荷酯之间进行1,3-偶极环加成而制得的。具有噻吩霉素对映体构型的(4S)-反式氮杂环丁酮(14)在16–20%ee中合成,而(4R)-顺式氮杂环丁酮的85.3%ee具有上皮霉素霉素A和B相同的绝对构型通过相同的反应步骤获得。还描述了3,4-二烷基化β-内酰胺的cd分配。