A facile and efficient method for the synthesis of N-substituted-3-oxoisoindoline-1-carbonitrile derivatives catalyzed by sulfamic acid
作者:Ling-Jun Hu、Zha-Jun Zhan、Min Lei、Li-Hong Hu
DOI:10.3998/ark.5550190.0014.315
日期:——
A new and efficientmethod for the synthesis of N-substituted 3-oxoisoindoline-1-carbonitrile derivatives by a one-pot, three-component condensation reaction of 2-carboxybenzaldehyde, primary amine, and TMSCN in the presence of 10 mol % sulfamicacid (NH2SO3H) as the catalyst in EtOH under reflux temperature is described. The process is simple and environmentally benign and the catalyst is commercially
effective chiral dialkylsulfide organocatalysts remain relatively rare and under‐developed, despite the potential utility of dialkylsulfide catalysts. Herein, we report the development of chiral bifunctional dialkylsulfide catalysts possessing a urea moiety for regio‐, diastereo‐, and enantioselective bromolactonization. The importance of the bifunctional design of chiral sulfide catalysts was clearly
Trifluoroacetic acid catalyzed highly regioselective bromocyclization of styrene-type carboxylic acid
作者:Tao Chen、Ying-Yeung Yeung
DOI:10.1039/c6ob00756b
日期:——
A trifluoroaceticacid catalyzed highly 6-endo regioselective bromocyclization of styrene-type carboxylic acid has been developed. The resulting 3,4-dihydroisocoumarines are valuable building blocks in organic synthesis.
challenging intramolecular hydroacyloxylation reaction. Both HFIP and an internal carboxy group have been proven to be crucial for the successful implementation of this transformation; these are proposed to assist the formation and stabilization of the key cationic intermediate via hydrogen-bondinginteractions with perrhenate anion (ReO4–).
该出版物描述了 Re 2 O 7在六氟异丙醇 (HFIP) 中的应用,用于活化惰性和电子失活的烯烃,以促进具有挑战性的分子内加氢酰氧基化反应。HFIP 和内部羧基均已被证明对于成功实施这一转变至关重要;这些被提议通过与高铼酸盐阴离子 (ReO 4 – )的氢键相互作用来帮助关键阳离子中间体的形成和稳定。