Silylative Carbocyclization of Allenyl-carbonyl Units with Et3SiH Catalyzed by Rhodium: Cis-Stereoselective Synthesis of Homoallylic Cycloalkanols
摘要:
GraphicsA new procedure for the synthesis of cis-2-triethylsilylvinyl-cyclopentanois and -cyclohexanols from allenyl-aldehydes and -ketones with Et-3-SiH through rhodium-catalyzed silylative carbocyclization is described. The use of Rh(acac)(CO)(2) (1 mol %) to promote the reaction results in a mild and convenient protocol for the three-component assembly.
A Convenient Synthesis of α-Methylene-γ-butyrolactones from Allenyl Carbonyl Units Mediated by Mo(CO)<sub>6</sub> through Intramolecular Cyclocarbonylation
作者:Chan-Mo Yu、Young-Taek Hong、Joon-Hwan Lee
DOI:10.1021/jo049252z
日期:2004.11.1
A novel procedure for the synthesis of cis-fused bicyclic alpha-methylene-gamma-butyrolactones from allenyl carbonyl functionalities via the molybdenum-mediated cyclocarbonylation is described. The use Of MO(CO)(6) with DMSO to promote reaction results in an efficient and convenient protocol through the three-component assembly in high yields.