Wittig Reactions in Water Media Employing Stabilized Ylides with Aldehydes. Synthesis of α,β-Unsaturated Esters from Mixing Aldehydes, α-Bromoesters, and Ph<sub>3</sub>P in Aqueous NaHCO<sub>3</sub>
作者:Amer El-Batta、Changchun Jiang、Wen Zhao、Robert Anness、Andrew L. Cooksy、Mikael Bergdahl
DOI:10.1021/jo070665k
日期:2007.7.1
range of stabilized ylides and aldehydes. Despite sometimes poor solubility of the reactants, good chemical yields normally ranging from 80 to 98% and high E-selectivities (up to 99%) are achieved, and the rate of the reactions in water is unexpectedly accelerated. The efficiency of water as a medium in the Wittig reaction is compared to conventional organic solvents ranging from carbon tetrachloride
Tandem Oxidation of Allylic and Benzylic Alcohols to Esters Catalyzed by N-Heterocyclic Carbenes
作者:Brooks E. Maki、Audrey Chan、Eric M. Phillips、Karl A. Scheidt
DOI:10.1021/ol062940f
日期:2007.1.1
N-heterocyclic carbenes catalyze the oxidation of allylic, propargylic, and benzylicalcohols to esters with manganese(IV) oxide in excellent yields. A variety of ester derivatives can be synthesized, including protected carboxylates. This one-pot tandemoxidation represents the first organocatalytic oxidation of alcohols to esters. Saturated esters can also be accessed from aldehydes using this method
Reductive Cleavage of TROC Groups Under Neutral Conditions with Cadmium-Lead Couple
作者:Q Dong
DOI:10.1016/00404-0399(50)1122x-
日期:1995.8.7
Cadmium-lead couple induces rapid and efficient reductive cleavage of TROC groups under extremely mild conditions. The couple is readily prepared and it is not pyrophoric.
Stereoselective Transformations of Trihalomethylcarbinols Induced by Chromous Chloride
作者:Romain Bejot、Steve Tisserand、L. Manmohan Reddy、Deb K. Barma、Rachid Baati、J. R. Falck、Charles Mioskowski
DOI:10.1002/anie.200461884
日期:2005.3.18
KIM SUNGGAK; YANG SUNGBONG, SYNTH. COMMUN., 1981, NO 2, 121-124