A Green, Solvent-Free, Microwave-Assisted, High-Yielding YbCl<sub>3</sub>Catalyzed Deprotection of THP/MOM/Ac/Ts Ethers of Chalcone Epoxide and 2′-Aminochalcone and Their Sequel Cyclization
作者:Sumit Kumar、Nishant Verma、Iram Parveen、Naseem Ahmed
DOI:10.1002/jhet.2517
日期:2016.11
Under microwave and solvent‐free conditions, YbCl3 efficiently catalyzed the deprotection of tetrahydropyran‐2‐yl, methoxymethyl (MOM), acetyl, and tosyl groups and sequel cyclization of chalcone epoxide to 2‐hydroxyindanone and 2′‐aminochalcone to aza‐flavanone. The reaction afforded the products in excellent yield (78–99%) at 850 W microwave heating within 1–5 min under eco‐friendly conditions. The
在无微波和无溶剂的条件下,YbCl 3有效催化四氢吡喃-2-基,甲氧基甲基(MOM),乙酰基和甲苯磺酰基的脱保护作用,并将查尔酮环氧化物的续环化成2-羟基茚满酮和2'-氨基查尔酮成氮杂黄酮。 。该反应在环保条件下在1-5分钟内在850 W微波加热下以极好的收率(78–99%)提供了产品。所提出方案的优点包括高收率,使用微波辐射,无溶剂条件,催化剂可重用性以及无需通过柱色谱法纯化。本方法比先前报道的方法温和得多但先进得多。