Cw. Holzapfel et al., A SIMPLE CYCLOADDITION APPROACH TO A RACEMATE OF THE NATURAL SWEETENER MONATIN, Synthetic communications, 24(22), 1994, pp. 3197-3211
The reaction of methyl 2-(3-indolylmethyl)-acrylate 2 with carbethoxyf
ormonitrile oxide 3, followed by saponification and reduction, gives m
ainly racemic monatin 1. Preliminary attempts to adapt the 2+3 cycload
dition to a new chiral synthesis of monatin, is described.