Expedient access to saturated nitrogen heterocycles by photoredox cyclization of imino-tethered dihydropyridines
作者:Noah B. Bissonnette、J. Michael Ellis、Lawrence G. Hamann、Fedor Romanov-Michailidis
DOI:10.1039/c9sc03429c
日期:——
relevant molecules bear nitrogen and sp3-hybridized carbon functionalities. Overwhelmingly, these atoms are found as part of (hetero)cyclic structures. Despite their importance, synthetic approaches to saturated nitrogen heterocycles are limited to several established stoichiometric alkylation techniques, as well as a few methods involving C-H bond activation. The synthetic community remains interested
大部分与医学相关的分子具有氮和sp3杂化的碳官能团。绝大多数情况下,发现这些原子是(杂环)环状结构的一部分。尽管它们的重要性,但饱和氮杂环的合成方法仅限于几种已建立的化学计量烷基化技术,以及一些涉及CH键活化的方法。合成社区仍然对访问这些主题的更一般,温和和可持续的方式感兴趣。在这里,我们描述了一种由铱光催化剂和磷酸锂碱组成的双催化剂体系,该体系能够通过质子偶联电子转移(PCET)选择性地均化4-烷基-1,4-二氢吡啶的NH键。 ,并通过束缚的亚胺介导生成的碳中心自由基的有效环化。