Abstract
AbstractPolycyclic indoles are prevailed in natural products, pharmaceuticals and biologically active compounds. Herein is described photo‐induced difluoromethylation‐cyclization of N‐alkene tethered indoles to synthesis of tetrahydropyrido[1,2‐a]indole using 5‐((difluoromethyl)sulfonyl)‐1‐phenyl‐1H‐tetrazole as a CF2H radical source. This photochemical reaction tolerates an array of functional groups like ester, cyano, ketone, halide, ether, aldehyde and heteocycles. Mechanistic experiments indicated that the difluoromethyl radical and the single electron transfer were involved.
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