Synthesis of Vinca Alkaloids and Related Compound 103. Recognition of an Unexpected Reaction and Its Application in Building the Aspidospermane Skeleton. Simple Synthesis of 15b-Hydroxyvincadifformine
作者:György Kalaus、Flórián Tóth、István Greiner、Mária Kajtár-Peredy、Ágnes Gömöry、László Hazai、Csaba Szántay
DOI:10.3987/com-05-10603
日期:——
Reaction of tryptamine derivative (2b) and acetate ester (11) built up from 2-(chloromethylene)butanal (4) resulted in enamino ketone (14). Dehydration of 14 and subsequent intramolecular [4+2] cycloaddition led to 15-oxovincadifformine (15). Regio- and stereoselective reduction of the latter molecule supplied 15β-hydroxyvincadifformine (1).
色胺衍生物 (2b) 和由 2-(氯亚甲基) 丁醛 (4) 形成的乙酸酯 (11) 反应生成烯胺酮 (14)。14 的脱水和随后的分子内 [4+2] 环加成导致 15-oxovincadifformine (15)。后一种分子的区域选择性和立体选择性还原提供了 15β-羟基长春二甲双胍 (1)。