The hypercoordinated tin reagent iPr-tricarbastannatrane is employed in B(C6F5)3-catalyzed transfer 1,4-hydrostannanylation of electron deficient olefins.
In this paper, Pd‐catalyzed [4+2] decarboxylative cycloaddition of 4‐vinylbenzodioxinones with barbiturate‐derived alkenes has been developed, leading to various spirobarbiturate−chromane derivatives in high yields with excellent diastereo‐ and enantioselectivities. The scale‐up reaction and further derivation of the product were demonstrated. A plausible reaction mechanism was also proposed.