Design, Synthesis, and Evaluation of a Novel Sequence-Selective Epoxide-Containing DNA Cross-Linking Agent Based on the Pyrrolo[2,1-<i>c</i>][1,4]benzodiazepine System
作者:Stuart C. Wilson、Philip W. Howard、Stephen M. Forrow、John A. Hartley、Lesley J. Adams、Terence C. Jenkins、Lloyd R. Kelland、David E. Thurston
DOI:10.1021/jm981124d
日期:1999.10.1
10-step route involving a pro-N10-Fmoc cleavage method that should have general applicability to other pyrrolobenzodiazepine (PBD) molecules containing acid- or nucleophile-sensitive groups. During the course of this work, a one-pot reductive cyclization procedure for the synthesis of PBD N10-C11 imines from nitro dimethyl acetals was also discovered, although this method results in C11a racemization which
已经研究了合成途径以制备新型的C8-环氧官能化的吡咯并[2,1-c] [1,4]苯并二氮杂6 6作为潜在的序列选择性DNA交联剂(Wilson等,Tetrahedron Lett。1995, 36,6333-6336)。通过涉及N10-Fmoc原裂解方法的10步路线成功完成了合成,该方法应普遍适用于其他含有酸或亲核敏感基团的吡咯并苯并二氮杂(PBD)分子。在这项工作的过程中,还发现了一锅还原环化程序,用于从硝基二甲基乙缩醛合成PBD N10-C11亚胺,尽管这种方法导致C11a外消旋,可降低DNA结合亲和力和细胞毒性。通过热变性研究显示,目标环氧化物6具有比母体DC-81(3)或C8-丙氧基-PBD(15)高得多的DNA结合亲和力,后者在结构上相似但缺少环氧化物部分。对热变性的影响的时间过程表明快速的初始结合阶段,随后是较慢的阶段,这与观察到的双官能剂DNA的逐步交联一致。通过电泳分析证实了这一点,该电泳分析证明了在浓度大于1