Selective Metal Cation Activation of a DNA Alkylating Agent: Synthesis and Evaluation of Methyl 1,2,9,9a-Tetrahydrocyclopropa[<i>c</i>]pyrido[3,2-<i>e</i>]indol-4-one-7-carboxylate (CPyI)
作者:Dale L. Boger、Christopher W. Boyce
DOI:10.1021/jo000177b
日期:2000.6.1
metal cation complexation. The synthesis of CPyI was based on a modified Skraup quinoline synthesis followed by a 5-exo-trig aryl radical cyclization onto an unactivated alkene with subsequent TEMPO trap or 5-exo-trig aryl radical cyclization onto a vinyl chloride for synthesis of the immediate precursor. Closure of the activated cyclopropane, accomplished by an Ar-3' spirocyclization, provided the
1,2,9,9a-四氢环丙烷[c]吡啶基[3,2-e]吲哚-4-一-7-羧酸盐(CPyI)的合成,该化合物在杜卡霉素中具有C环吡咯的一个碳原子膨胀详细描述了SA烷基化亚基及其掺入天然产物的类似物中。预期CPyI的独特8-酮喹啉结构将提供一种可调节的方法,以通过选择性金属阳离子络合实现活化。CPyI的合成基于改良的Skraup喹啉合成,然后将5-exo-trig芳基自由基环化到未活化的烯烃上,随后进行TEMPO捕集,或将5-exo-trig芳基自由基环化到氯乙烯上以合成直接前体。通过Ar-3'螺环化完成活化环丙烷的封闭,提供了10个步骤的CPyI核,并具有出色的整体转化率(29%)。对基于CPyI的药物的评估显示出与CC-1065和Duocarmycin A相当的内在稳定性,但它比duocarmycin SA和基于CBI的药物更具活性(3-4x)。向CPyI中添加亲核试剂的pH速率曲线表明,在pH