Asymmetric formal total synthesis of the stemofoline alkaloids: the evolution, development, and application of a catalytic dipolar cycloaddition cascade
作者:Charles S. Shanahan、Chao Fang、Daniel H. Paull、Stephen F. Martin
DOI:10.1016/j.tet.2013.03.104
日期:2013.9
operation from an acyclic precursor. The key step in the synthesis is a novel dipolarcycloadditioncascade sequence that is initiated by cyclization of a rhodium-derived carbene onto the nitrogen atom of a proximal imine group to generate an azomethine ylide that then undergoes spontaneous cyclization via dipolarcycloaddition. The synthesis features several other interesting reactions, including a Boord
Enantioselective Formal Total Syntheses of Didehydrostemofoline and Isodidehydrostemofoline through a Catalytic Dipolar Cycloaddition Cascade
作者:Chao Fang、Charles S. Shanahan、Daniel H. Paull、Stephen F. Martin
DOI:10.1002/anie.201205274
日期:2012.10.15
Sweet to the core: Enantioselectiveformal total syntheses of the title compounds were accomplished in 24 steps from 2‐deoxy‐D‐ribose. The synthesis features a novel cascade of reactions culminating in an intramolecular dipolar cycloaddition to form the tricyclic core of the stemofoline alkaloids from an acyclic diazo imine intermediate.
Sweet to the core:标题化合物的对映选择性形式全合成是从 2-脱氧-D-核糖分24 步完成的。该合成的特点是一系列新的反应,最终在分子内偶极环加成反应中从无环重氮亚胺中间体形成茎叶林生物碱的三环核心。