Transition-metal-free alkylation strategy: facile access to alkylated oxindoles <i>via</i> alkyl transfer
作者:Wen-Qin Yu、Jian-Hong Fan、Pu Chen、Bi-Quan Xiong、Jun Xie、Ke-Wen Tang、Yu Liu
DOI:10.1039/d2ob00019a
日期:——
The transition-metal-free alkylation/cyclization of activated alkenes using Hantzschesterderivatives as effective alkyl reagents is described. A wide variety of valuable oxindoles was constructed in a single step with excellent selectivity. The reaction occurs through the formation of alkyl radical species followed by the tandem addition/annulation of olefins under oxidative conditions. This protocol
An Efficient and Fast Procedure for the Hantzsch Dihydropyridine Synthesis under Microwave Conditions
作者:Liselotte Öhberg、Jacob Westman
DOI:10.1055/s-2001-16043
日期:——
A single-mode microwave cavity synthesizer with temperature and pressure control was used to accelerate the Hantzsch synthesis of 4-aryl and 4-alkyl-2,6-dimethyl-1,4-dihydro-3,5-pyridinedicarboxylates. In comparison with both conventional methods and microwave-assisted reactions performed in a domestic microwave oven, shorter reaction times and higher yields were obtained. The improved yields under microwave conditions made it possible to synthesize a small library, with acceptable purity.
Cardani et al., Atti della Accademia Nazionale dei Lincei, Classe di Scienze Fisiche, Matematiche e Naturali, Rendiconti, 1952, vol. <8> 13, p. 257,261
作者:Cardani et al.
DOI:——
日期:——
USY-zeolite catalyzed synthesis of 1,4-dihydropyridines under microwave irradiation: structure and recycling of the catalyst
作者:Leonardo H.R. Alponti、Monize Picinini、Ernesto A. Urquieta-Gonzalez、Arlene G. Corrêa
DOI:10.1016/j.molstruc.2020.129430
日期:2021.3
therapeutically and also as visible‐light photoredox catalysts. In this work we report the application of an ultra-stable (US) Y zeolite as a promising green catalyst in the synthesis of a series of 1,4-dihydropyridines undermicrowaveirradiation. Using the optimized reaction conditions, 21 compounds were prepared in 64-96% isolated yields. The recovery and recycle of the USY zeolite are also reported as well