Selective, Catalytic, and Dual C(sp<sup>3</sup>)–H Oxidation of Piperazines and Morpholines under Transition-Metal-Free Conditions
作者:Delfino Chamorro-Arenas、Urbano Osorio-Nieto、Leticia Quintero、Luís Hernández-García、Fernando Sartillo-Piscil
DOI:10.1021/acs.joc.8b02564
日期:2018.12.21
innocuous reagents, such as NaClO2, NaOCl, and catalytic amounts of TEMPO, a new environmentally friendly protocol for the selective and catalytic TEMPO C(sp3)–H oxidation of piperazines and morpholines to 2,3-diketopiperazines (2,3-DKP) and 3-morpholinones (3-MPs), respectively, has been developed. This novel direct access to 2,3-DKP from piperazines provides significant advantages over the traditional
通过使用廉价且无害的试剂(例如NaClO 2,NaOCl和催化量的TEMPO),将TEMPO C(sp 3)–H选择性和催化氧化哌嗪和吗啉氧化成2,3-二酮哌嗪的新环保协议( 2,3-DKP)和3-吗啉酮(3-MP)已被开发出来。与传统的N-单酰化/分子内C–N环化方法相比,这种从哌嗪直接获得2,3-DKP的方法具有明显的优势。另外,通过调节TEMPO的量,可以从吗啉衍生物制备2-烷氧基氨基-3-吗啉酮,这将使吗啉骨架的C2位进一步官能化。