First Cobalt(I)-Catalyzed [6 + 2] Cycloadditions of Cycloheptatriene with Alkynes
作者:Mathieu Achard、Alphonse Tenaglia、Gérard Buono
DOI:10.1021/ol050618j
日期:2005.6.1
CoI2(dppe)/Zn/ZnI2 system effectively catalyzes the [6 + 2] cycloaddition of cycloheptatriene with terminal alkynes to afford 7-alkyl-bicyclo[4.2.1]nona-2,4,7-trienes in fair to excellent yields. The catalyst proved to be tolerant toward functional groups such as ketone, sulfone, ester, ketal, ether, alcohol, imide, and nitrile. The enantioselective cycloaddition of CHT and phenylacetylene with BINOL phosphoramidite