Group-assisted purification (GAP) chemistry for dihydrofurans: water as a medium for catalyst free synthesis in a one pot four component reaction
作者:Madhu Chennapuram、Narender Reddy Emmadi、Chiranjeevi Bingi、Jagadeesh Babu Nanubolu、Krishnaiah Atmakur
DOI:10.1039/c4gc00388h
日期:——
A simple, catalyst free, water mediated, one pot four component, green protocol was developed for title compounds 7 starting from aromatic aldehydes (1), malononitrile (2), 1,3-diones (3) and N-chlorosuccinimide (NCS) in a sequential addition reaction at ambient temperature. The approach presented herein, for the first time, is through an unusual rearrangement where NCS was reacted with 2-amino-7,
为标题化合物7开发了一种简单的,无催化剂,水介导的,一锅四组分的绿色方案,起始于芳族醛(1),丙二腈(2),1,3-二酮(3)和N-氯代琥珀酰亚胺(NCS)在室温下按顺序加成反应。本文首次提出的方法是通过不寻常的重排,其中NCS与2-氨基-7,7-二甲基-5-氧代-4-芳基-5,6,7,8-四氢-4 H反应-chromene-3-carbontritrile(4),它是由醛和丙二腈的Knoevenagel缩合,然后迈克尔加成3形成的。此外,这种新颖的方案与各种醛和具有活性的C–H功能衍生物兼容,可实现高收率并遵循GAP化学原理。有趣的是,化合物4与NCS在酒精介质中反应时,得到2-氰基-6,6-二甲基-4-氧代-3-芳基-2,3,4,5,6,7-六氢苯并呋喃-2-羧酸酯(5) 。