Syntheses of .alpha.- and .gamma.-substituted amides, peptides, and esters of methotrexate and their evaluation as inhibitors of folate metabolism
作者:J. R. Piper、J. A. Montgomery、F. M. Sirotnak、P. L. Chello
DOI:10.1021/jm00344a018
日期:1982.2
ester (2) and gamma-benzyl ester (6) served as key intermediates in syntheses of precursors to amides and peptides of methotrexate (MTX) involving both the alpha- and gamma-carboxyl groupings of the glutamate moiety. Coupling of 2 and 6 at the open carboxyl grouping with amino compounds was affected by the mixed anhydride method (using isobutyl chloroformate); carboxyl groupings of amino acids coupled
N- [4-[[(苯甲氧基)羰基]甲基氨基]苯甲酰基] -L-谷氨酸α-苄基酯(2)和γ-苄基酯(6)是合成甲氨蝶呤酰胺和肽前体的关键中间体(MTX)涉及谷氨酸部分的α-和γ-羧基。混合酸酐法(使用氯甲酸异丁酯)影响开放式羧基上的2和6与氨基化合物的偶联。与2和6偶联的氨基酸的羧基被保护为苄基酯。N- [4-[[((苄氧基)羰基]甲基氨基]苯甲酰基] -L-谷氨酸γ-甲基酯(5)是由L-谷氨酸γ-甲基酯制备的,是MTXγ-甲基酯的前体。 4-[[((苄氧基)羰基]甲基氨基]苯甲酰氯(1)的制备方法类似于制备2和6的方法。通过在含有(i-Pr)2NEt的DMF中用MeI处理由γ-苄基酯6制备MTXα-甲基酯的前体。通过氢解作用除去苄基和(苄氧基)羰基保护基,并将脱保护的侧链前体通过与6-(溴甲基)-2,4-的烷基化反应转化为MTX的α-和γ-取代的酰胺,肽和酯。蝶啶二胺氢溴酸盐(12)。对制