Synthesis, X-ray Structure, and Properties of Fluorocyclopropane Analogs of the Duocarmycins Incorporating the 9,9-Difluoro-1,2,9,9a-tetrahydrocyclopropa[<i>c</i>]benzo[<i>e</i>]indol-4-one (F<sub>2</sub>CBI) Alkylation Subunit
作者:Dale L. Boger、Tracy J. Jenkins
DOI:10.1021/ja961888n
日期:1996.1.1
(24) provided a key analog of the duocarmycins. A study of the solvolysis of N-BOC-F2CBI (19) revealed that introduction of the difluorocyclopropane substitution increased the reactivity 500× without altering the inherent regioselectivity which occurred with nucleophilic addition to the difluoro substituted C9 cyclopropane carbon. A single-crystal X-ray structure analysis of 17 and its comparison with
9,9-difluoro-1,2,9,9a-tetrahydrocyclopropa[c]benz[e]indol-4-one (F2CBI) 的合成,CC-1065 的二氟环丙烷类似物和 duocarmycin 烷基化亚基,代表第一个此类试剂含有取代天然产物中的反应中心,详述。F2CBI 的核心结构是通过使用对醌二叠氮将分子内金属类卡宾插入 1,1-二氟烯烃 (74%) 的反应制备的,并将其掺入 F2CBI-TMI (24) 中提供了双癌霉素的关键类似物。对 N-BOC-F2CBI (19) 的溶剂分解的研究表明,二氟环丙烷取代的引入将反应性提高了 500 倍,而不会改变与二氟取代的 C9 环丙烷碳进行亲核加成时发生的固有区域选择性。