L-(+)-Tryptophan methyl ester derived polymeric microbeads as an efficient heterogeneous catalyst for green synthesis of 2-amino-4-(nitromethyl)-4H-chromene-3- carbonitriles
Aqueous-mediated Michael Addition of Active Methylene Compounds with Nitroalkenes
作者:Wenkai Dong、Dongcheng Xu、Jianwu Xie
DOI:10.1002/cjoc.201200228
日期:2012.8
A simple, atom economical and highly efficient green protocol has been developed for the synthesis of Michael adducts of nitroalkenes and 2‐amino‐2‐chromene derivatives by Michael addition of activemethylenecompounds (such as malononitrile and ethyl cyanoacetate) to nitroalkenes under aqueous‐mediated conditions. This green approach provided the desired products in high yields and the reaction scope
Aegle marmelos in heterocyclization: greener, highly efficient, one-pot three-component protocol for the synthesis of highly functionalized 4H-benzochromenes and 4H-chromenes
作者:Sachin Shinde、Shashikant Damate、Smita Morbale、Megha Patil、Suresh S. Patil
DOI:10.1039/c6ra28779d
日期:——
A facile, one-potthree-component protocol for the synthesis of 2-amino-4H-chromene derivatives has been demonstrated using Bael Fruit Extract (BFE) as a natural catalyst in a green reaction medium. This method offers a mild, efficient and highly economical protocol since the reaction proceeds in natural BFE-catalyst at room temperature under aerobic conditions with a very short reaction time (30 min)
Biocatalytic one-pot three-component synthesis of 4H-chromene derivatives in non-aqueous medium
作者:Prabhakar Shrivas、Umesh Pratap
DOI:10.1007/s11696-018-00679-5
日期:2019.5
The baker’s yeast catalyzed one-potthree-component cyclocondensation of salicylaldehyde, malononitrile or ethyl cyanoacetate, and nitroalkanes for the synthesis of substituted 2-amino-4H-chromene derivatives is presented. The highlights of the protocol is a use of a biodegradable catalyst which is inexpensive, having simple reaction conditions, in other words, at room temperature and neutral pH, good-to-excellent
Synthesis of
<scp>4</scp>
<i>H</i>
‐chromene‐isoxazole hybrids via
<i>ortho</i>
‐hydroxy directing cyclization of isoxazole‐styrenes and Michael addition of imino‐chromenes in aqueous medium
作者:Sakkani Nagaraju、Kota Sathish、Dhurke Kashinath
DOI:10.1002/jhet.4251
日期:2021.6
AbstractA green, efficient, and one‐pot method synthesis of functionalized 4H‐chromene‐isoxazole hybrids is reported via o‐hydroxy group directing cyclization of isoxazole‐styrenes and Michael addition of 3,5‐dimethyl‐4‐nitroisoxazole on 2‐imino‐2H‐chromene‐3‐carbonitrile (independent methods). The developed methodology was further extended for nitromethane, malononitrile, and alkylcyanoacetates as Michael donors.