DDQ-Induced Dehydrogenation of Heterocycles for CC Double Bond Formation: Synthesis of 2-Thiazoles and 2-Oxazoles
作者:Xiangnan Li、Cheng Li、Bing Yin、Cong Li、Ping Liu、Jianli Li、Zhen Shi
DOI:10.1002/asia.201300267
日期:2013.7
Strong as an Ox: 2‐Thiazoles and 2‐oxazoles are formed by oxidation of 2‐thiazolines and 2‐oxazolines without requiring substituents at the C4 and C5 positions. DDQ plays an important role as the oxidant in this transformation and metal is unnecessary. This general procedure shows good functional group tolerance and provides a wide variety of 2‐thiazoles and 2‐oxazoles in moderate to excellent yields
Tandem reactions of nitriles with 2-aminoethanethiolhydrochloride or amino alcohols in the presence of a catalytic amount of cupric methacrylate (CuII2L4, L = methacrylate) were employed to prepare 2-thiazolines and 2-oxazolines under mild reaction conditions. The synthetic procedure showed high selectivity for the synthesis of mono- and bis-thiazolines and oxazolines, and a variety of 2-thiazolines
Synthesis of thiazolines by the reaction of aryl ketonitriles with cysteamine<i>via</i>microwave irradiation
作者:Sukanta Kamila、Edward R. Biehl
DOI:10.1002/jhet.5570440220
日期:2007.3
Thiazolines were synthesized in a one-pot reaction in excellent yield using a newly developed methodology. Ketonitriles were directly condensed with cysteamine (2-amino-thioalcohol) via microwave irradiation at 210°C for 10 minutes under solvent free conditions and without any solid support. All the compounds were characterized by 1H nmr, 13C nmr spectroscopy and elemental analyses.
使用一种新开发的方法,通过一锅反应以优异的产率合成了噻唑啉。在无溶剂条件下且无任何固体载体的情况下,通过在210°C微波辐射10分钟将酮腈与半胱胺(2-氨基-硫醇)直接缩合。所有化合物均通过1 H nmr,13 C nmr光谱和元素分析进行表征。