Diethoxytriphenylphosphorane: a mild, regioselective cyclodehydrating reagent for conversion of diols to cyclic ethers: stereochemistry, synthetic utility, and scope
Diethoxytriphenylphosphorane: a mild, regioselective cyclodehydrating reagent for conversion of diols to cyclic ethers: stereochemistry, synthetic utility, and scope
Inversion of Configuration at the Phosphorus Nucleophile in the Diastereoselective and Enantioselective Synthesis of P‐Stereogenic
<i>syn</i>
‐Phosphiranes from Chiral Epoxides
作者:Jake A. Muldoon、Balázs R. Varga、Meaghan M. Deegan、Timothy W. Chapp、Ádám M. Eördögh、Russell P. Hughes、David S. Glueck、Curtis E. Moore、Arnold L. Rheingold
DOI:10.1002/anie.201801427
日期:2018.4.23
Nucleophilic substitution results in inversion of configuration at the electrophilic carbon center (SN2) or racemization (SN1). The stereochemistry of the nucleophile is rarely considered, but phosphines, which have a high barrier to pyramidal inversion, attack electrophiles with retention of configuration at P. Surprisingly, cyclization of bifunctional secondary phosphine alkyl tosylates proceeded
亲核取代导致亲电子碳中心(S N 2)或外消旋化(S N 1)的构型反转。亲核试剂的立体化学很少考虑,但是对金字塔倒置具有高阻隔性的膦会攻击亲电试剂并保留P的构型。令人惊讶的是,双功能仲膦烷基甲苯磺酸盐的环化反应在温和的条件下进行,亲核试剂的构型反转以产生P-立体顺-phosphiranes。DFT研究表明,新的立体化学是由酸促进的甲苯磺酸酯解离产生中间体yield桥联的阳离子,该阳离子经历了顺选择性环化。
Reactions of alkenes with [hydroxy(tosyloxy)iodo]benzene: stereospecific syn-1,2-ditosyloxylation of the carbon-carbon double bond and other processes
作者:Louis Rebrovic、Gerald F. Koser
DOI:10.1021/jo00187a032
日期:1984.6
Dibutyltin Oxide Catalyzed Selective Sulfonylation of α-Chelatable Primary Alcohols
作者:Michael J. Martinelli、Naresh K. Nayyar、Eric D. Moher、Ulhas P. Dhokte、Joseph M. Pawlak、Rajappa Vaidyanathan
DOI:10.1021/ol990658l
日期:1999.8.1
The reaction of substituted glycols with catalytic dibutyltin oxide, stoichiometric p-toluenesulfonyl chloride, and triethylamine in CH2Cl2 resulted in the complete and rapid sulfonylation at the primary alcohol, The alpha-heterosubstituted primary alcohol moiety appeared optimal for best results, supporting the intermediacy of a five-membered chelate, The role of the amine is discussed, in addition to catalyst requirements and solvent effects.
Functionalization of alkenes and alkynes with [hydroxy(tosyloxy)iodo]benzene. Bis(tosyloxy)alkanes, vinylaryliodonium tosylates, and alkynylaryliodonium tosylates
作者:Gerald F. Koser、Louis Rebrovic、Richard H. Wettach