A facile and efficient stereoselective synthesis of functionalized substituted γ-butyrolactones in excellent yield from the Baylis–Hillman adducts of isatin derivatives by a reductive cyclization methodology is reported.
A facile, atom-economical, catalyst-free protocol for the hydrosulfonation of densely functionalized alkenes with sulfinic acids in an environmentally benign solvent system at ambient temperature is described.