T. Balasubramanian et Kk. Balasubramanian, RADICAL CYCLIZATION OF O-HALOARYL ALLENYLMETHYL ETHERS AND AMINES - SYNTHESIS OF 3-ETHENYL-2,3-DIHYDROBENZOFURANS AND 3-ETHENYL-2,3-DIHYDROINDOLES, Synlett, (11), 1994, pp. 946-948
o-Haloaryl allenylmethyl ethers and amines upon treatment with n-Bu3Sn
H and AIBN in refluxing benzene, underwent a 5-exo-trig free radical c
yclisation to give the respective 3-ethenyl-2,3-dihydrobenzofurans and
3-ethenyl-2,3-dihydroindoles in good yields.