A New Route to 7-Substituted Derivatives of <i>N</i>-{4-[2-(2-Amino-3,4-dihydro-4-oxo-7<i>H</i>-pyrrolo[2,3-<i>d</i>]pyrimidin-5-yl)- ethyl]benzoyl}-<scp>l</scp>-glutamic Acid [ALIMTA (LY231514, MTA)]<sup>1</sup>
作者:Edward C. Taylor、Bin Liu
DOI:10.1021/jo001580l
日期:2001.6.1
unexpected redox reaction to the diethyl esters 9 of a series of 7-substituted derivatives of ALIMTA (LY231514, MTA), from which the target analogues 10 were readily prepared by saponification. Attempted deprotection at position 7 was successful in only one case (9d, R = CH(2)C(6)H(3)(OMe)(2)(-3',4'), which resulted in a known pentultimate precursor (9, R = H) of ALIMTA. The 7-substituted derivatives 10 proved
用巴豆基溴将各种伯胺烷基化,然后用DMAP促进用甲基丙二酰氯酰化为4,然后由三乙酸锰二水合物/乙酸铜诱导的自由基环化,得到1-取代的4-乙烯基-3-羰基甲氧基-2-吡咯烷酮( 5)。然后对硫代内酰胺6进行硫杂化和胍环化,得到一系列的2-氨基-3,4-二氢-4-氧代-5-乙烯基-7-取代的吡咯并[2,3-d]嘧啶(7)。钯催化的CC与4-碘苯甲酰谷氨酸二乙酯的偶联反应通过意外的氧化还原反应一步一步地与ALIMTA的一系列7-取代衍生物的二乙基酯9(LY231514,MTA)结合,从中可以轻松地制备目标类似物10皂化。仅在一种情况下(9d,R = CH(2)C(6)H(3)(OMe)(2)(-3',4'),尝试在7位脱保护成功,得到已知的ALIMTA的五倍前体(9,R = H)。7-取代的衍生物10被证明在体外作为细胞分裂的抑制剂是无活性的。