Reactions of Grignard Reagents with Bis- or Mono-Phosphonium lons in Situ Generated from Bu3P and Dicarboxylic Acid Dichlorides or .OMEGA.-Ethoxycarbonyl Alkanoyl Chlorides as a Novel Method to Obtain Diketones and Ketoesters.
mixture of BusP and the Grignard reagent (2.0 eq each) was added to the dichloride solution at the same temperature, a better result was obtained. The latter method not with PhMgBr but with n-BuMgCl or MeMgBr was shown to be useful for preparation of symmetrical alkanediones and keto alkanoates from various 5 (n=2-6) and 13 (n=2 or 3), respectively. For synthesis of alpha-diketones or alpha-ketoesters
C-C Bond Formation by Oxidative Ring-Opening Homocoupling of Cyclobutanols
作者:Huiying Zeng、Pan Pan、Jinping Chen、Hang Gong、Chao-Jun Li
DOI:10.1002/ejoc.201601505
日期:2017.2.10
The formation of a C(sp(3))-C(sp(3)) bond by oxidative ring-opening homocoupling of cyclobutanols was explored. A broad scope of 1-substituted cyclobutanols were transformed into C(sp(3))-C(sp(3)) bond-formation products by oxidative ring opening in good to high yields under exceptionally mild conditions in an open flask in just 30 s.
Samarium Diiodide Induced Reactions of Cyclopropyl Ketones: Reductive Ring Cleavage and Dimerization Leading to 1,8-Diketones – Scope, Limitations, Mechanisms