One-pot synthesis of (Z)-β-sulfonyl enoates from ethyl propiolate
作者:C. Wade Downey、Smaranda Craciun、Ana M. Neferu、Christina A. Vivelo、Carly J. Mueller、Brian C. Southall、Stephanie Corsi、Eric W. Etchill、Ryan J. Sault
DOI:10.1016/j.tetlet.2012.08.051
日期:2012.10
β-Sulfonyl enoates may be synthesized through a one-pot two-step sequence from ethylpropiolate with good to excellent selectivity for the Z isomer. Trialkylamines catalyze thioconjugate additions of aryl thiols, and alkoxides catalyze the addition of aliphatic thiols. Addition of meta-chloroperbenzoic acid (mCPBA) and LiClO4 to the reaction mixture provides rapid access to the sulfonyl enoates. Yields
One-pot three-step thioconjugate addition-oxidation-Diels–Alder reactions of ethyl propiolate
作者:C. Wade Downey、Smaranda Craciun、Christina A. Vivelo、Ana M. Neferu、Carly J. Mueller、Stephanie Corsi
DOI:10.1016/j.tetlet.2012.08.054
日期:2012.10
Ethylpropiolate undergoes one-pot three-step thioconjugate addition-oxidation-Diels–Alder cycloaddition when treated with a variety of thiols in the presence of catalytic base, meta-chloroperbenzoic acid, lithium perchlorate, and cyclopentadiene. The reaction of S-aryl thiols is catalyzed by trialkylamines, and the reaction of aliphatic thiols requires catalytic alkoxide base. Yields of the major
Organocatalytic, Regioselective Nucleophilic “Click” Addition of Thiols to Propiolic Acid Esters for Polymer-Polymer Coupling
作者:Vinh X. Truong、Andrew P. Dove
DOI:10.1002/anie.201209239
日期:2013.4.8
Discerning Tastes: The regioselectivity of the nucleophilic addition of thiols to electron‐deficient alkynes is controlled by the choice of the solvent (i.e. the polarity of the reaction mixture) and the catalyst. Both thioalkenes and dithianes can be prepared in a rapid reaction that generates no by‐products (see scheme). In turn the utility of this reaction is shown for efficient end‐group modification