Decarboxylative Knoevenagel-Type Reactions on Tetronamides: Synthesis of 5-Ylidene-4-Amino-2(5H)-Furanones
摘要:
A detailed account regarding the synthesis of 5-ylidene-2(5H)-furanones is given. The key step is a decarboxylative Knoevenagel-type reaction of tetronamides with various -functionalized aldehydes. The synthesis of protected basidalin is presented.
Total Synthesis of the Antitumor Antibiotic Basidalin
作者:Jaime A. M. Acosta、Ramesh Muddala、Luiz C. A. Barbosa、John Boukouvalas
DOI:10.1021/acs.joc.6b01255
日期:2016.8.5
The first synthesis of the tetronamide antibiotic basidalin was accomplished in five steps and 39% overall yield from readily available 4-bromo-2-triisopropylsilyloxyfuran and 2-formyl-1,3-dithiane. Highlights include: (i) regio- and stereocontrolled assemblage of a pivotal (Z)-γ-ylidene-β-bromobutenolide intermediate by stereodirected vinylogous aldol condensation (SVAC), (ii) installation of the