A Versatile Synthesis of Various Substituted Taurines from Vicinal Amino Alcohols and Aziridines
作者:Ning Chen、Weiyi Jia、Jiaxi Xu
DOI:10.1002/ejoc.200900759
日期:2009.11
Taurine and structurally diverse substituted taurines have been synthesized by peroxyformic acid oxidation of the thiazolidine-2-thione intermediates generated from vicinal amino alcohols or aziridines and carbon disulfide. Thestereochemistry and mechanisms of the reactions are disscussed. The method is a salt-free and versatile route, convenient in terms of purification, and can be used to synthesize
Novel Chiral Bifunctional L-Thiazoline-Thiourea Derivatives: Design and Application in EnantioselectiveMichael Reactions
作者:Qi Lai、Yang Li、Zhiyong Gong、Qingwen Liu、Chiyu Wei、Zhiguang Song
DOI:10.1002/chir.22540
日期:2015.12
Several novelchiralbifunctional L‐thiazoline‐thioureaderivatives were easily synthesized from commercially available L‐cysteine in high yield. These catalysts were subsequently applied to the enantioselective Michael addition of acetylacetone to β‐nitrostyrenes. The products with S configuration were obtained in 98% enantiomeric excess (ee) when the L‐thiazoline‐thioureaderivatives were used. A
Novel chiral bifunctional l-thiazoline-amide derivatives: design and application in the direct enantioselective aldol reactions
作者:Zhiyong Gong、Chiyu Wei、Ye Shi、Qingchuan Zheng、Zhiguang Song、Zaiqun Liu
DOI:10.1016/j.tet.2014.01.006
日期:2014.3
Several novelchiral bifunctional l-thiazoline-amide derivatives were simply synthesized from commercially available l-cysteine and l-proline in high yield. These catalysts were subsequently applied to the direct enantioselectivealdolreactions of various aldehydes, which are rarely reported in the literature. The products with anti configuration were obtained up to 97% ee and 99% dr when the l-thiazoline-amide
作者:Hsiao Chi-Nung、Stephen P. Ashburn、Marvin J. Miller
DOI:10.1016/s0040-4039(00)94969-4
日期:1985.1
The compatability of an acyl thiazolidine thione as a chiral auxillary in boron enolate chemistry has been demonstrated by an enantioselective aldol condensation. The aldol products provide direct access to chiral β-lactams.
amide bond among a sea of other amides is a significant and long-standing challenge. Although the use of twisted amides has been demonstrated for modifications of inert C–N amide bonds, none of these methods can selectively activate a particular amide bond for C–Cbond formation in the presence of similar amides. Using density functional theory as a guide, we report the first site-selective C–C bond