Enantiodivergency and Enantioconvergency in the Synthesis of the Dendrobate Alkaloid 241D
作者:Nemai Saha、Shital K Chattopadhyay
DOI:10.1021/jo3019329
日期:2012.12.21
diastereodivergent preparation of two N-alkenylnitrones (9 and 11) from easily available (R)-2,3-O-cyclohexylideneglyceraldehyde (5) led to an enantiodivergent synthesis of both enantiomers of the dendrobate alkaloid 241D in a sequential two-directional approach involving intramolecular nitrone cycloaddition as the key step. Either of these two nitrones could, in principle, be utilized for the preparation of
从易于获得的(R)-2,3- O-环己基甘油醛(5)制备两个N-烯基硝酮(9和11)的非对映异构体导致了按顺序双向方法对树状生物碱241D的两个对映体进行对映异构体合成涉及分子内硝酮的环加成反应是关键步骤。原则上,这两种硝酮中的任何一种也可以以对映收敛的方式用于制备标题化合物。该方法被扩展以制备(-)-241D的类似物(33)。