作者:Juan Marco-Martínez、Verónica López-Carrillo、Elena Buñuel、Raquel Simancas、Diego J. Cárdenas
DOI:10.1021/ja0685598
日期:2007.2.1
Pd-catalyzed cyclization of 1,6-enynes in the presence of bis(pinacolato)diboron affords homoallylic alkylboronates. The reaction is general and proceeds with differently substitutedalkenes and with both internal and terminal alkynes. It tolerates the presence of β-hydrogens and is stereoselective in the formation of both the new stereogenic centers and the alkene. This synthesis of alkylboronates
Diastereocontrolled nickel(0)- and palladium(0) catalyzed “metallo-ene-type” cyclizations/carbonylations
作者:Wolfgang Oppolzer、Thomas H. Keller、Manuel Bedoya-Zurita、Charles Stone
DOI:10.1016/s0040-4039(01)93496-3
日期:1989.1
Treatment of 1-iodoacetoxy}-2,7-octadienes and 1-iodoacetoxy}-2-en-7-ynes with Ni(COD)2/dppb (THF/MeOH) or Pd(dba)2/PPh3 (AcOH, then CH2N2) under carbon monoxide furnished chemo- and stereoselectively either bicyclic ketoesters (from ) and (from ) or trans-substituted monocyclic products (from ) and (from ), but all-cis-hexahydroindole (from acetoxycyclohexene .
Palladium-catalyzed intramolecular alkyne-carbon monoxide-alkene insertion cascade for synthesis of .alpha.-methylenecyclopentenones
作者:Nathan C. Ihle、Clayton H. Heathcock
DOI:10.1021/jo00055a006
日期:1993.1
A method for the construction of alpha-methylenecyclopentenones fused to five-membered rings using a palladium catalyst is reported. The procedure involves the formation of pi-allylpalladium intermediates that undergo sequential intramolecular alkyne insertion, carbon monoxide insertion, intramolecular alkene insertion, and beta-hydride elimination. Examples of the cyclization are seen in eq 2 and Scheme III.