Green approach to synthesis of novel and broad-range diversity of 4-(aryl)-3-(phenylsulfonyl)-4H-benzo[h]chromen-2-amine derivatives
作者:Abdollah Morshedi、Hamid Reza Shaterian
DOI:10.1007/s11164-018-3552-4
日期:2018.12
Abstract One-pot, three-component condensation reaction between (phenylsulfonyl)acetonitrile, aromatic aldehydes, and α-naphthol for preparation of 4-(aryl)-3-(phenylsulfonyl)-4H-benzo[h]chromen-2-amine derivatives has been reported. The method involves domino Knoevenagel condensation/Michaeladdition, and cyclization cascade. The reaction was performed in glycerol, which is a commercially available
摘要 (苯磺酰基)乙腈,芳香醛与α-萘酚的一锅三组分缩合反应,用于制备4-(芳基)-3-(苯磺酰基)-4 H-苯并[ h ]铬-2-胺衍生物已经被报告了。该方法涉及多米诺Knoevenagel缩合/迈克尔加成和环化级联。该反应在甘油中进行,甘油是一种可商购的,廉价且无毒的化合物。产品的高纯度,极高的收率和广泛的底物是该方案的优点。 图形概要
Catalytic Asymmetric Approach to 1,3,4,5‐Tetrahydro‐1,4‐benzodiazepin‐2‐ones in One‐Pot
Herein we illustrate a first asymmetric synthesis of medicinally attractive tetrahydro‐1,4‐benzodiazepin‐2‐ones performed under catalytic conditions and one‐pot fashion. The process relies on a sequential Knoevenagel reaction/asymmetric epoxidation/domino ring‐opening cyclization (DROC) using commercially available aldehydes, phenylsulfonylacetonitrile, cumyl hydroperoxide, 2‐(aminomethyl)aniline and a readily available quinine‐derived urea as the catalyst. The heterocycles have been isolated with good regioselectivity, satisfactory to good yield and up to 98 % ee. The protocol proved also to be suitable for the preparation of previously undescribed 1,5‐dihydro‐4,1‐benzoxazepin‐3(2H)‐ones with up to 86 % ee.