Coenzyme models. 48. Novel diastereo-differentiating hydrogen transfer and "rope-skipping" racemization in chiral flavinophanes and 5-deazaflavinophanes
13C NMR as a general tool for the assignment of absolute configuration
作者:Iria Louzao、José Manuel Seco、Emilio Quiñoá、Ricardo Riguera
DOI:10.1039/c0cc02774j
日期:——
(13)C NMR, alone or in combination with (1)H NMR, allows the assignment of the absolute configuration of chiral alcohols, amines, carboxylic acids, thiols, cyanohydrins, sec,sec-diols and sec,sec-aminoalcohols, derivatized with appropriate chiral auxiliaries. This extends the assignment possibilities of NMR to fully deuterated and to nonproton containing compounds.
Chiral Thiols: The Assignment of Their Absolute Configuration by <sup>1</sup>H NMR
作者:Silvia Porto、José Manuel Seco、Aurelio Ortiz、Emilio Quiñoá、Ricardo Riguera
DOI:10.1021/ol7022196
日期:2007.11.1
A general NMR spectroscopy protocol for determination of absoluteconfiguration of thiols, that includes the introduction of new aryl-tert-butoxyacetic acids as chiral derivatizing agents (CDAs), is described.
A synthetic method equivalent to an enantioselective alkylation of thioglycolic acid to opticallyactive α-alkylated thioglycolic acids via an opticallyactive 1,3-oxathiolan-5-one intermediate is described.
A Thioesterase for Chemoselective Hydrolysis of <i>S</i>-Acyl Sulfanylalkanoates
作者:Ish Kumar、Ravinder S. Jolly
DOI:10.1021/ol0069195
日期:2001.1.1
[GRAPHICS]A thioesterase, isolated from a strain of Alcallgenes sp. ISH108, chemoselectively hydrolyzes thiol esters. The application of the enzyme has been demonstrated in the preparation of the antihypertensive agent captopril.
LIU, HUNG-HSIN;CHEN, ERH-NING;UANG, BIING-JIUN;WANG, SUE-LEIN, TETRAHEDRON LETT. , 31,(1990) N, C. 257-260