Syntheses of 2-Benzylbenzofuran Derivatives and 2-Aryl-nitrochroman Derivatives from Nitroalkene Precursors
作者:Chia-Yu Huang、Chun-Wei Kuo、Veerababurao Kavala、Ching-Fa Yao
DOI:10.1002/ejoc.201600314
日期:2016.5
the synthesis of 2-benzylbenzofuran, 3-substituted 2-benzylbenzofuran, and 2-aryl-nitrochroman derivatives are described. Benzofurans were generated from nitroalkenes by reduction with NaBH4 followed by a Nef reaction and acid-mediated cyclization, whereas 3-substituted 2-benzylbenzofurans were prepared from nitroalkenes by reactions with Grignard reagents followed by a Nef reaction and an acid-mediated
描述了合成 2-苄基苯并呋喃、3-取代的 2-苄基苯并呋喃和 2-芳基-硝基色满衍生物的简单直接的方法。苯并呋喃是由硝基烯烃通过用 NaBH4 还原,然后进行 Nef 反应和酸介导的环化而产生的,而 3-取代的 2-苄基苯并呋喃是通过与格氏试剂反应,然后是 Nef 反应和酸介导的环化反应由硝基烯烃制备的。 - 锅过程。色满的合成涉及 Knoevenagel 缩合和 1,4-二氮杂双环 [2.2.2] 辛烷 (DABCO) 辅助 β-(2-羟基苯基)-硝基乙烷和苯甲醛的环化,也是在一锅法中。