Metal-Free Generation of γ-Cyanoalkyl Radicals by N-Heterocyclic Carbene Catalysis: Assembly of 6-Cyanoalkyl Phenanthridines
作者:Qianrong Li、Cong-Ying Zhou、Chengming Wang
DOI:10.1021/acs.orglett.2c03808
日期:2022.12.23
number of γ-cyanoalkyl radicals were generated by sustainable N-heterocyclic carbene catalysis in tin-, transition-meal-, and light-free conditions, followed by insertion into biaryl isonitriles, thus leading to the rapid assembly of a variety of diversely functionalized 6-cyanoalkyl phenanthridines. A preliminary mechanism study revealed that a single-electron transfer radical process was possibly involved
Synthesis of highly substituted fluorenones via metal-free TBHP-promoted oxidative cyclization of 2-(aminomethyl)biphenyls. Application to the total synthesis of nobilone
作者:Ilya A P Jourjine、Lukas Zeisel、Jürgen Krauß、Franz Bracher
DOI:10.3762/bjoc.17.181
日期:——
Highlysubstituted fluorenones are readily prepared in mostly fair to good yields via metal- and additive-free TBHP-promoted cross-dehydrogenative coupling (CDC) of readily accessible N-methyl-2-(aminomethyl)biphenyls and 2-(aminomethyl)biphenyls. This methodology is compatible with numerous functional groups (methoxy, cyano, nitro, chloro, and SEM and TBS-protective groups for phenols) and was further
通过不含金属和添加剂的 TBHP 促进的易于获得的N-甲基-2-(氨甲基)联苯和 2-(氨甲基)联苯的交叉脱氢偶联 (CDC),可以轻松制备高度取代的芴酮,收率基本上相当到良好。该方法与多种官能团(甲氧基、氰基、硝基、氯以及苯酚的 SEM 和 TBS 保护基团)兼容,并进一步用于天然产物诺比隆的首次全合成。