作为化学合成的一个特别独特的目标,重氮酰胺 A 有可能通过多种合成路线构建,每一条都面临着不同的挑战和发现机会。在本文中,我们详细介绍了第二次重氮酰胺 A 的全合成,其序列与我们第一次战役中使用的序列完全不同,该战役的成功需要开发几种特殊的战略和战术。我们还公开了我们关于重氮酰胺 A 及其结构同系物的化学生物学的完整研究,并更全面地描述了我们使用吡啶缓冲 POCl(3) 进行 Robinson-Gabriel 环脱水的方案的范围。
Divergent Conversion of <i>N</i>-Acyl-isoxazol-5(2<i>H</i>)-ones to Oxazoles and 1,3-Oxazin-6-ones Using Photoredox Catalysis
作者:Mingjing Mei、Devireddy Anand、Lei Zhou
DOI:10.1021/acs.orglett.9b00903
日期:2019.5.17
visible light photoredox catalysis has been disclosed. The catalyst-controlled divergent mechanisms, namely the oxidative and reductive quenching catalytic cycle, are utilized. Various oxazoles and 1,3-oxazin-6-ones are selectively obtained from the same isoxazol-5-one skeleton under mild conditions.
A highly efficient method for the synthesis of oxazole derivativesfrom simple amides and ketones has been established via a Pd(II)-catalyzed sp2 C–H activation pathway in one step. The reaction is supposed to proceed through a C–Nbond formation followed by a C–O bond formation closing the ring. Because of the simple and readily available starting materials, easy operation, and high bioactivity of
Intra- and intermolecular thermal transformations of 2-acyl- and 2-alkoxycarbonyl-N-phthalimidoaziridines
作者:M. A. Kuznetsov、V. V. Voronin
DOI:10.1007/s10593-011-0738-8
日期:2011.5
Heating 2-acyl- and 2-alkoxycarbonyl-N-phthalimidoaziridines leads to substituted oxazoles in 45-65% yield. Only esters of oxazolecarboxylic acids are formed when the aziridine contains acyl and alkoxy groups. The thermolysis of the same aziridines in the presence of N-phenylmaleimide and the dimethyl ester of acetylenedicarboxylic acid gives both oxazoles and the products of 1,3-dipolar cycloaddition from aziridines with two substituents at the carbon atoms but only oxazoles from trisubstituted aziridines.