Enantioselective Enolate Protonation in Sulfa–Michael Addition to α-Substituted <i>N</i>-Acryloyloxazolidin-2-ones with Bifunctional Organocatalyst
作者:Nirmal K. Rana、Vinod K. Singh
DOI:10.1021/ol202808n
日期:2011.12.16
Organocatalytic conjugate addition of thiols to α-substituted N-acryloyloxazolidin-2-ones followed by asymmetric protonation has been studied in the presence of cinchona alkaloid derived thioureas. Both of the enantiomers are accessible with the same level of enantioselectivity using pseudoenantiomeric quinine/quinidine derived catalysts. The addition/protonation products have been converted to useful biologically
[EN] HEPATITIS C VIRUS INHIBITORS<br/>[FR] INHIBITEURS DU VIRUS DE L'HEPATITE C
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2003099274A1
公开(公告)日:2003-12-04
Hepatitis C virus inhibitors are disclosed having the general formula:(I) wherein R1, R2, R3, R', B, Y and X are described in the description. Compositions comprising the compounds and methods for using the compounds toinhibit HCV are also disclosed.
Efficient Synthesis of Spirooxindole Pyrrolones by a Rhodium(III)‐Catalyzed C−H Activation/Carbene Insertion/Lossen Rearrangement Sequence
作者:Biao Ma、Peng Wu、Xing Wang、Zhengyu Wang、Hai‐Xia Lin、Hui‐Xiong Dai
DOI:10.1002/anie.201906589
日期:2019.9.16
A rhodium(III)-catalyzed domino annulation of simple olefins with diazo oxindoles to give spirooxindole pyrrolone products is described. This reaction can be formally viewed as the result of an anomalous tandem C-H activation, carbene insertion, Lossen rearrangement, and a nucleophilic addition process. The potential utility of this reaction was further demonstrated by the late-stage diversification
Water-initiated hydrocarboxylation of terminal alkynes with CO<sub>2</sub> and hydrosilane
作者:Meng-Meng Wang、Sheng-Mei Lu、Kumaraswamy Paridala、Can Li
DOI:10.1039/d0cc06320g
日期:——
This work discloses a Cu(II)–Ni(II) catalyzed tandem hydrocarboxylation of alkynes with polysilylformate formed from CO2 and polymethylhydrosiloxane that affords α,β-unsaturated carboxylic acids with up to 93% yield. Mechanistic studies indicate that polysilylformate functions as a source of CO and polysilanol. Besides, a catalytic amount of water is found to be critical to the reaction, which hydrolyzes
A carboxyl-assisted C–H functionalization of acrylic acids with formaldehyde to give butenolides is described. It is the first time that the addition of an inert vinylic C–H bond to formaldehyde has been achieved via cobalt-catalyzed C–H activation. The unique reactivity of the cobalt species was observed when compared with related Rh or Ir catalysts. γ-Hydroxymethylated butenolides were produced by
描述了用甲醛对丙烯酸进行羧基辅助的 C-H 官能化以得到丁烯内酯。这是首次通过钴催化的 C-H 活化将惰性乙烯基 C-H 键添加到甲醛中。与相关的 Rh 或 Ir 催化剂相比,观察到钴物种的独特反应性。γ-羟甲基化丁烯内酯是通过Na 2 CO 3在一锅催化反应后处理制备的。