利用叶绿素选择性 PET 和 EnT 催化合成 N-烷基化喹啉-2(1H)-酮、异喹啉-1(2H)-酮和 1,2,4-三恶烷
摘要:
分别通过选择性光诱导电子转移(PET)和能量转移(EnT)实现了喹啉-2(1 H )-酮、异喹啉-1(2 H )-酮和1,2,4-三恶烷的光催化合成,由叶绿素在可见光照射下产生。喹啉-2(1 H )-酮、异喹啉-1(2 H )-酮和1,2,4-三恶烷是具有生物活性的支架,其遵循温和反应方案的合成受到高度追捧。这项工作展示了叶绿素的不同光催化作用,即喹啉或异喹啉的电子转移以及以烯丙醇为底物的能量转移,在绿色反应条件下提供有氧氧化。机理研究证实,催化循环遵循电子转移途径来进行N-烷基(异)喹啉鎓盐的氧化。此外,该方法为(N)-杂环的有机转化提供了一种环境友好、简单的反应策略。
Reductive Synthesis of Aminal Radicals for Carbon–Carbon Bond Formation
作者:David A. Schiedler、Yi Lu、Christopher M. Beaudry
DOI:10.1021/ol500024q
日期:2014.2.21
Aminal radicals were generated by reduction of the corresponding amidine or amidinium ion. The intermediate radicals participate in C–C bond-forming reactions to produce fully substituted aminal stereocenters. No toxic additives or reagents are required. More than 30 substrate combinations are reported, and chemical yields are as high as 99%.
The development of carbon–carbon bond forming reactions of aminal radicals
作者:David A. Schiedler、Jessica K. Vellucci、Yi Lu、Christopher M. Beaudry
DOI:10.1016/j.tet.2014.12.067
日期:2015.3
Aminal radicals were generated and used in synthetic reactions for the first time. Aminal radicals are formed from aminals by radical translocation using AIBN and a stoichiometric hydrogen atom donor, or by SmI2 reduction of N-acyl amidines or amidinium ions in the presence of a proton source. Aminal radicals were found to participate in inter- and intramolecular C–C bondformingreactions with electron