Oxazolines. 2. 2-Substituted 2-oxazolines as synthons for N-(.beta.-hydroxyethyl)arylalkylamines, intermediates in a synthesis of 1,2,3,4-tetrahydroisoquinolines and 2,3,4,5-tetrahydro-1H-3-benzazepines
A new and simple method for the synthesis of oxazolines from readily accessible olefins and amidesusing tert-butyl hypoiodite is described; aromatic/aliphatic olefins and amides can be used in the reaction to give a variety of oxazolines.
An efficient catalytic protocol based on reusable MgAl-layered double hydroxides has been developed for the synthesis of multi-functionalized oxazolines via the cyclocondensation of amidines and aminoalcohols. The developed method has a broad substrate scope and excellent functionalgroup tolerance and uses a reusable catalyst. The catalyst can be conveniently recycled by filtration and reused for
The annulation reactions of benzoamidyl radicals with alkenes were realized under visible light irradiation with fac-Ir(ppy)3 as catalyst and N-aminopyridinium salts as benzoamidyl radical precursors. The reaction can deliver two distinct types of products: in the case of vinyl arenes, [3 + 2] annulation product dihydrooxazoles were yielded exclusively; when alkyl-substituted alkenes were used, on the
strategy is described here. Amide is used as the O- and N- source to probe for regiocontrol strategies. Notably, simple additives can be selectively introduced to achieve regiodivergent oxyamination processes for electronically activated alkenes while being regio-complementary for unactivated alkenes. Our preliminary data demonstrates that this regiocontrol strategy based on nucleophile can also be applied
本文描述了一种新型碘化物催化分子间氨氧化策略。酰胺用作 O 源和 N 源来探测区域控制策略。值得注意的是,可以选择性地引入简单的添加剂,以实现电子活化烯烃的区域发散的氧胺化过程,同时对未活化的烯烃进行区域互补。我们的初步数据表明,这种基于亲核试剂的区域控制策略也可以应用于使用手性高价碘催化的不对称过程。
Synthesis of 2,5-Disubstituted Oxazoles and Oxazolines Catalyzed by Ruthenium(II) Porphyrin and Simple Copper Salts
作者:Chuan Long Zhong、Bo Yang Tang、Ping Yin、Yue Chen、Ling He
DOI:10.1021/jo202663n
日期:2012.5.4
A novel and moderate synthesis of 2,5-disubstituted oxazoles and oxazolines involving ruthenium(II) porphyrin copper chloride catalyzed cyclization was developed. These reactions using readily available benzene carboxylic acids and phenylethenes or phenylacetylenes are performed under mild conditions. The reactions proceed in series, giving rise to the formation of an intermolecular C-N bond and an intramolecular C-O bond, which yield oxazole or oxazoline derivatives simultaneously.