Reactions of complex ligands 85: chiral quinoid and hydroquinoid [2.2]metacyclophanes via chromium-mediated intramolecular benzannulation
作者:K.H. Dötz、A. Gerhardt
DOI:10.1016/s0022-328x(98)01125-5
日期:1999.4
A meta-alkynyl (chromium alkenylcarbene) functionalized benzene 5 is synthesized in a six-step sequence starting from 3-bromomethyliodobenzene. Upon gentle warming in tetrahydrofuran methoxy[alkynylaryl(alkenyl)carbene complex 5 undergoes an intramolecular benzannulation to give [2.2]metacyclophane 6 bearing two chiral planes due both to the cyclophane skeleton and the Cr(CO)3-coordinated methyl-substituted