Bifunctional phase-transfer catalysts for synthesis of 2-oxazolidinones from isocyanates and epoxides
作者:Dong-Xiao Cui、Yue-Dan Li、Ping Huang、Zhuang Tian、Yan-Yan Jia、Ping-An Wang
DOI:10.1039/d0ra00693a
日期:——
A series of bifunctional phase-transfercatalysts (PTCs) were synthesized to catalyze the [3 + 2] coupling reaction of isocyanates and epoxides to afford 2-oxazolidinones in good to high yields (up to 92% yield) using PhCl as a solvent at 100 °C within 12 h. These bifunctional PTCs were easily prepared from commercially available tertiary-primary diamines and isocyanates (or isothiocyanates, mono-squaramides
one-component organocatalyst for the atom-economic transformation of epoxides to oxazolidinones under microwave irradiation. Integrating a positively charged center into phenols over a modular one-step preparation gives rise to a bifunctional system with improved acidity and activity, competent in rapid assembly of epoxides and isocyanates under microwave irradiation in a short reaction time (20–60 min)
A Multicomponent Approach to Oxazolidinone Synthesis Catalyzed by Rare‐Earth Metal Amides
作者:Meixia Zhou、Xizhou Zheng、Yaorong Wang、Dan Yuan、Yingming Yao
DOI:10.1002/cctc.201900221
日期:2019.12.5
Three‐component reaction of epoxides, amines, and dimethyl carbonate catalyzed by rare‐earth metal amides has been developed to synthesize oxazolidinones. 47 examples of 3,5‐disubstituted oxazolidinones were prepared in 13–97 % yields. This is a simple and most practical method which employs easily available substrates and catalysts, and is applicable to a wide range of aromatic and aliphatic amines
Tetraarylphosphonium Salt-Catalyzed Synthesis of Oxazolidinones from Isocyanates and Epoxides
作者:Yasunori Toda、Shuto Gomyou、Shoya Tanaka、Yutaka Komiyama、Ayaka Kikuchi、Hiroyuki Suga
DOI:10.1021/acs.orglett.7b02722
日期:2017.11.3
Preparation of a range of oxazolidinones, including enantioenriched N-aryl-substituted oxazolidinones, in which tetraarylphosphonium salts (TAPS) catalyze the [3 + 2] coupling reaction of isocyanates and epoxides effectively, is described. The key finding is a Brønsted acid/halide ion bifunctional catalyst that can accelerate epoxide ring opening with high regioselectivity. Mechanistic studies disclosed
Triethylamine Hydroiodide as a Bifunctional Catalyst for the Solvent-Free Synthesis of 2-Oxazolidinones
作者:Ryuichi Nishiyori、Ken Okuno、Seiji Shirakawa
DOI:10.1002/ejoc.202000771
日期:2020.8.23
An efficient synthesis of 2‐oxazolidinones from epoxides and isocyanates under solvent‐free conditions, featuring the use of triethylamine hydroiodide as a simple and effective bifunctional organocatalyst is developed.