Synthesis and Complete Stereochemical Assignment of Psymberin/Irciniastatin A
作者:Xin Jiang、Jorge García-Fortanet、Jef K. De Brabander
DOI:10.1021/ja0537068
日期:2005.8.1
We describe a concise and flexible synthetic avenue for the preparation of compounds with structures relevant to those proposed for the novel marine-derived differential cytotoxins psymberin and irciniastatin A. Our efforts led to their complete stereochemical assignment and the notion that psymberin and irciniastatin A are identical compounds. Our total synthesis features an interesting termini-differentiating
我们描述了一种简洁灵活的合成途径,用于制备结构与新型海洋衍生差异细胞毒素 psymberin 和 irciniastatin A 相关的化合物。我们的努力导致了它们的完整立体化学分配以及 psymberin 和 irciniastatin A 相同的概念化合物。我们的全合成具有从 C2 对称双烯烃前体获得的二醛的有趣的末端差异化乳醇化、差向异构腈的温和铂催化水解、制备灵敏的亚胺酸甲酯的新方案和一锅法转化这些亚胺酯转化为 N-酰基胺。从片段 5-7 开始(每个片段准备 7-8 个步骤,
Stereoselective synthesis of a series of 1,3-dioxan-4-ylmethanes 1−9 has been achieved by use of solely substrate-based asymmetric induction. The simple C2-symmetric bis(dioxanyl)methane 1 has a greater than 99% conformational preference at the two inter-ring bonds for the conformation 1a. The homologous structures 3−9 contain up to five dioxanylmethane units, maintaining a high conformational preference