Catalytic Enantioselective Michael Addition of α-Aryl-α-Isocyanoacetates to Vinyl Selenone: Synthesis of α,α-Disubstituted α-Amino Acids and (+)- and (−)-Trigonoliimine A
作者:Thomas Buyck、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201306663
日期:2013.11.25
title reaction in the presence of the catalyst 1 afforded Michael adducts in excellent yields and enantioselectivities. The adducts were readily converted into α,α′‐disubstituted α‐aminoacids. The enantioselective total synthesis of both (+)‐ and (−)‐trigonoliimine A was accomplished using one of the Michael adducts derived from this methodology. M.S.=molecular sieves.
Total Synthesis, Stereochemical Assignment, and Biological Activity of All Known (−)-Trigonoliimines
作者:Sunkyu Han、Karen C. Morrison、Paul J. Hergenrother、Mohammad Movassaghi
DOI:10.1021/jo4020358
日期:2014.1.17
A full account of our concise and enantioselective total syntheses of all known (−)-trigonoliimine alkaloids is described. Our retrobiosynthetic analysis of these natural products enabled identification of a single bistryptamine precursor as a precursor to all known trigonoliimines through a sequence of transformations involving asymmetric oxidation and reorganization. Our enantioselective syntheses
描述了我们对所有已知 (-)-trigonoliimine 生物碱的简洁和对映选择性全合成的完整说明。我们对这些天然产物的逆生物合成分析能够通过一系列涉及不对称氧化和重组的转化,鉴定出一种单一的双色胺前体作为所有已知葫芦亚胺的前体。我们对这些生物碱的对映选择性合成能够修正 (-)-trigonoliimines A、B 和 C 的绝对立体化学。我们报告说,trigonoliimines A、B、C 和结构相关的化合物对 HeLa 和 U-937 细胞显示出较弱的抗癌活性.