Palladium(0)-catalyzed cyclization-carbonylation of 2,7-octadienyl acetate and homologues
摘要:
The palladium(0)-catalyzed carbonylations, in acetic acid as a necessary solvent, of 2,7-octadienyl acetate and homologues via pi-allylpalladium species were preceded by their intramolecular oelfin insertion to form mixtures of cis/trans-2-vinylcyclopentylacetyl- and cis/trans-cyclohexylacetylpalladium intermediates, which undergo further the intramolecular (5-exo) Heck reaction to give bicyclo-[3.3.0] and [4.3.0] skeletons, respectively, except for one case affording trans-2-vinylcyclopentylacetic acid as a major product.
A three-step tandem process for the synthesis of bicyclic γ-lactams
作者:Fiona I. McGonagle、Lindsay Brown、Andrew Cooke、Andrew Sutherland
DOI:10.1039/c004695g
日期:——
A one-pot, three-step tandem process has been developed for the direct synthesis of functionalised bicyclic [3.3.0], [4.3.0] and [5.3.0] γ-lactams from simple allylic trichloroacetimidates. The process involves a palladium(II) mediated Overman rearrangement followed by the use of Grubbs first generation complex which catalyzes both a ring closing metathesis reaction and a Kharasch cyclization. As well
A Tandem Aza-Claisen Rearrangement and Ring Closing Metathesis Reaction for the Synthesis of Cyclic Allylic Trichloroacetamides
作者:Michael D. Swift、Andrew Sutherland
DOI:10.1021/ol702299c
日期:2007.12.1
A one-pot tandem palladium(II)-catalyzed aza-Claisenrearrangement and ring closing metathesis process has been developed for the efficient synthesis of cyclic allylic trichloroacetamides. The use of chiral Pd(II) catalysts such as (S)-COP-Cl during the rearrangement stage results in the preparation of these compounds in excellent yields and in high enantiomeric excess.
A stereoselective synthesis of (+)-physoperuvine using a tandem aza-Claisen rearrangement and ring closing metathesis reaction
作者:Ahmed M. Zaed、Michael D. Swift、Andrew Sutherland
DOI:10.1039/b907341h
日期:——
A stereoselective synthesis of (+)-physoperuvine, a tropane alkaloid from Physalis peruviana Linne has been developed using a one-pot tandem aza-Claisen rearrangement and ringclosingmetathesisreaction to form the key amino-substituted cycloheptene ring.