Regioselective synthesis of naphthalenes from modified Baylis–Hillman adducts via a Pd-catalyzed cyclization: 5-exo-carbopalladation, C(sp3)–H activation to cyclopropane, ring-opening, and aromatization cascade
摘要:
Modified Baylis-Hillman adducts having 2-bromophenyl acetonitrile moiety at the primary position underwent a Pd-catalyzed cascade reaction to provide poly-substituted naphthalene derivatives in reasonable yields. The reaction involved a sequential 5-exo-carbopalladation, C(sp(3))-H activation to cyclopropane, ring-opening and concomitant aromatization processes. (C) 2010 Elsevier Ltd. All rights reserved.