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The chiral (salen)Cr(III)/BF 3 ·OEt 2 catalytic combination was found to be an effective catalyst for intramolecular Friedel-Crafts cyclization of electron-deficient Morita-Baylis-Hillman adducts. In presence of mild reaction conditions the chiral (salen)Cr(III)/BF 3 ·OEt 2 complex affords 2-substituted-1 H -indenes from unique substrates of Morita-Baylis-Hillman adducts via an easy operating practical procedure.

beilstein journal of organic chemistry

Facile and innovative catalytic protocol for intramolecular Friedel–Crafts cyclization of Morita–Baylis–Hillman adducts: Synergistic combination of chiral (salen)chromium(III)/BF3·OEt2 catalysis