Synthesis of 2,4,6-trisubstituted pyridines via an olefin cross-metathesis/Heck–cyclisation–elimination sequence
作者:Timothy J. Donohoe、John F. Bower、David B. Baker、José A. Basutto、Louis K. M. Chan、Peter Gallagher
DOI:10.1039/c1cc14257g
日期:——
cross metathesis, to allow the instalment of substituents at the beta position. Subsequent one-pot cyclisation/elimination provides an operationally simple, catalytic and convergent synthesis of 2,4,6-trisubstitutedpyridines.
An efficient method for the synthesis of multi-substituted pyridines from β-aryl-substituted α,β-unsaturated oxime ethers and alkenes via Pd-catalyzed C-H activation has been developed. The method, using Pd(OAc)2 and a sterically hindered pyridine ligand, provides access to various multi-substituted pyridines with complete regioselectivity. Mechanistic studies suggest that the pyridine products are