Abstract An efficient catalyst-free microwave (MW)-assisted method was elaborated for the batch and continuous flow synthesis of N-alkyl-isoindolinone phosphonates by the three-component reaction of 2-formylbenzoic acid, primary amines and various dialkyl phosphites. The reaction was also extended to various secondary phosphine oxides and primary amines, as well. In order to obtain more information
Study on the Microwave-Assisted Batch and Continuous Flow Synthesis of N-Alkyl-Isoindolin-1-One-3-Phosphonates by a Special Kabachnik–Fields Condensation
作者:Ádám Tajti、Nóra Tóth、Bettina Rávai、István Csontos、Pál Tamás Szabó、Erika Bálint
DOI:10.3390/molecules25143307
日期:——
Kabachnik–Fields reaction of 2-formylbenzoic acid, butylamine and diethylphosphite was monitored by in situ FT-IR spectroscopy. The novel title compounds could be prepared in high yields at low temperature under a short reaction time. A suitable method could also be developed for the preparation of the isoindolin-1-one-3-phosphonates at a “few g” scale by using a continuous flow MW reactor.
A practical and efficient synthesis of racemic dialkyl (2-substituted-3-oxo-2,3-dihydro-1H-isoindol-1-yl) phosphonates has been developed via the three-component reaction of 2-formylbenzoic acid, various primary amines and trialkyl phosphites, using propylphosphonic anhydride (T3P®) as the condensing agent. The one-pot reaction was easily performed in boiling ethyl acetate.
An efficient and mild three-component synthesis of isoindolin-1-one-3-phosphonates is described. The reaction between a 2-formylbenzoicacid, a primary amine, and a trialkyl phosphite proceeded at ambient temperature under catalyst- and solvent-freeconditions to afford the desired compounds in excellent yields.
Expeditious synthesis of (±)-diethyl 2-alkyl- and 2-aryl-(3-oxoisoindolin-1-yl)phosphonates catalysed by OSU-6
作者:Nagendra Prasad Muddala、Baskar Nammalwar、Richard A. Bunce
DOI:10.1039/c5ra02307f
日期:——
A one-step strategy to prepare (±)-diethyl 2-alkyl- and 2-aryl-(3-oxoisoindolin-1-yl)phosphonates is reported via a modified Kabachnik–Fields condensation of 2-carboxybenzaldehyde with an amine and triethyl phosphite using OSU-6, an MCM-41 type mesoporous hexagonal silica, as the catalyst. The reaction proceeds to form the target compounds in high yields with minimal purification requirements. The