NBS-mediated sequential one-pot synthesis of multifunctionalized thiazoles and thiophenes from 1,3-dicarbonyl compounds and mercaptonitrile salts
作者:Laichun Luo、Lanlan Meng、Qi Sun、Zemei Ge、Runtao Li
DOI:10.1016/j.tetlet.2013.11.014
日期:2014.1
A NBS-mediated sequential one-pot synthesis of multifunctionalized thiazoles and thiophenes from 1,3-dicarbonyl compounds and mercaptonitrile salts has been developed under mild conditions. This transformation involves sequential bromination/SN2 alkylation/Thorpe–Zieglercyclization/regio-selective elimination of a –COR group, affording the desired products in moderate to good yields. The sequence
由NBS介导的从1,3-二羰基化合物和硫醇腈盐开始的多官能噻唑和噻吩的顺序一锅法合成已经在温和的条件下进行。该转化涉及顺序溴化/ S N 2烷基化/索普-齐格勒环化/ -COR基团的区域选择性消除,以中等至良好的收率提供所需的产物。确定了-COR基团离去反应的顺序,并提出了可能的机制。
A highly enantioselective Darzens reaction between diazoacetamides and aldehydes catalyzed by a (+)-pinanediol–Ti(OiPr)4 system
作者:Gang Liu、Daming Zhang、Jian Li、Guangyang Xu、Jiangtao Sun
DOI:10.1039/c2ob27179f
日期:——
A highly efficient enantioselective Darzens reaction of aldehydes with diazoacetamides catalyzed by a (+)-pinanediol–Ti(OiPr)4 system has been developed. The cis-glycidic amides were obtained in high yields and with moderate to excellent enantioselectivity (up to 99%).
已经开发了由(+)-ane二醇-Ti(O i Pr)4系统催化的醛与重氮乙酰胺的高效对映选择性Darzens反应。所述CIS以高收率得到,并与中度至良好的对映选择性(高达99%) -缩水甘油酰胺。
Highly Efficient Synthesis of β-Amino Acid Derivatives via Asymmetric Hydrogenation of Unprotected Enamines
作者:Yi Hsiao、Nelo R. Rivera、Thorsten Rosner、Shane W. Krska、Eugenia Njolito、Fang Wang、Yongkui Sun、Joseph D. Armstrong、Edward J. J. Grabowski、Richard D. Tillyer、Felix Spindler、Christophe Malan
DOI:10.1021/ja047901i
日期:2004.8.1
A direct asymmetrichydrogenation of unprotected enamino esters and amides is described. Catalyzed by Rh complexes with Josiphos-type chiral ligands, this method gives beta-amino esters and amides in high yield and high ee (93-97% ee). No acyl protection/deprotection is required.
描述了未保护的烯氨基酯和酰胺的直接不对称氢化。该方法由具有 Josiphos 型手性配体的 Rh 络合物催化,以高产率和高 ee (93-97% ee) 得到 β-氨基酯和酰胺。不需要酰基保护/脱保护。
Electroreductive synthesis of polyfunctionalized pyridin-2-ones from acetoacetanilides and carbon disulfide with oxygen evolution
作者:Lichun Xu、Zhongxiao Ma、Xi Hu、Xin Zhang、Shulin Gao、Deqiang Liang、Baoling Wang、Weili Li、Yanni Li
DOI:10.1039/d1ob02379a
日期:——
A reductant-free electroreductive synthesis of polyfunctionalized pyridin-2-ones under the combined action of electro/copper/base with O2 evolution.
一种无还原剂电还原合成多官能团吡啶-2-酮的方法,在电/铜/碱的共同作用下,并伴随着氧气的释放。
Access to α-Hydroxy Amides via a Practical Metal-Free “One-Pot” Tandem Reaction Involving Aerobic C(sp<sup>3</sup>)–H Hydroxylation and C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cleavage
作者:Xiao Zhang、Yang Yu、Wenjie Li、Lei Shi、Hao Li
DOI:10.1021/acs.joc.2c01839
日期:2022.12.16
A flexible metal-free cascade reactioninvolving aerobic C(sp3)–H hydroxylation and decarbonylation with high regioselectivity and functional group tolerance has been established. Moreover, this indirect hydroxylation approach of N-aryl amides could enable the construction of a wide range of valuable secondary alcohols at α-position of N-aryl amides. It provides a supplementary strategy for direct