Shanmugam, P; Vaithiyanathan, V
(Elsevier, 2008-04-07)
A concise stereoselective synthesis of 3-spiro-α-methylene-γ-butyrolactone oxindoles from Morita–Baylis–Hillman adducts of isatin in excellent yield has been achieved following a three-step reaction sequences viz. (1) ...