A novel and stereocontrolled synthesis of (5R)-(Z)-6-(1-methyl-1,2,3-triazol-4-ylmethylene)penem-3-carboxylic acid, a potent broad spectrum β-lactamase inhibitor
作者:Neal F. Osborne、Nigel J. P. Broom、Steven Coulton、John B. Harbridge、Michael A. Harris、Irene Stirling-François、Graham Walker
DOI:10.1039/c39890000371
日期:——
the condensation of the anion, generated by deprotonation of p-methoxybenzyl (5R,6S)-6-bromopenem-3-carboxylate(10), with 1-methyl-1,2,3-triazole-4-carbaldehyde; in situ acylation, followed by reductive elimination afforded the isomeric (Z)- and (E)-6-triazolylmethylene penem esters, (12) and (13) respectively.
由6-氨基青霉烯酸制备标题化合物(BRL 42715)的关键步骤是阴离子的缩合反应,该阴离子是由对甲氧基苄基(5 R,6 S)-6-溴openem-3-羧酸酯(10)去质子化而生成的),1-甲基-1,2,3-三唑-4-甲醛; 原位酰化,然后进行还原消除,分别得到异构体(Z)-和(E)-6-三唑基亚甲基戊二烯酸酯,分别为(12)和(13)。