Initiating radical cyclizations by H transfer from transition metals
作者:John Hartung、Mary E. Pulling、Deborah M. Smith、David X. Yang、Jack R. Norton
DOI:10.1016/j.tet.2008.10.030
日期:2008.12
diphosphine) can be used to initiate radicalcyclizations by transferring H to activated terminal olefins. CpCr(CO)3H can catalyze reductive cyclizations, with H2 as the ultimate reductant. Appropriate substrates can be assembled by the Morita–Baylis–Hillman reaction of methyl acrylate with an aldehyde. Six- as well as five-membered rings can be formed, and a tandem cyclization to decalin can be effected.