The ruthenium-catalyzed C–H functionalization of enamides with isocyanates: easy entry to pyrimidin-4-ones
作者:Pengfei Shi、Song Li、Lu-Min Hu、Cong Wang、Teck-Peng Loh、Xu-Hong Hu
DOI:10.1039/c9cc03612a
日期:——
Ruthenium-catalyzedheteroannulation between enamides and isocyanates has been realized as a complementary approach to conventional strategies for the synthesis of pyrimidin-4-ones. High step- and atom-economy was achieved for the rapid construction of such privileged scaffolds, which are found in a multitude of pharmaceutical compounds. The generality and practicability of this transformation were
Selective Dehydrogenative Acylation of Enamides with Aldehydes Leading to Valuable β-Ketoenamides
作者:Rui-Hua Liu、Zhen-Yao Shen、Cong Wang、Teck-Peng Loh、Xu-Hong Hu
DOI:10.1021/acs.orglett.9b04495
日期:2020.2.7
We have presented a unique example of dehydrogenative acylation of enamides with aldehydes enabled by an earth-abundant iron catalyst. The protocol provides the straightforward access to valuable β-ketoenamides with ample substrate scope and excellent functional group tolerance. Notably, distinct C-H acylation of enamide rather than at N-H moiety site occurs with absolute Z-selectivity was observed
Palladium-Catalyzed C(sp<sup>3</sup>)—H Oxygenation via Electrochemical Oxidation
作者:Qi-Liang Yang、Yi-Qian Li、Cong Ma、Ping Fang、Xiu-Jie Zhang、Tian-Sheng Mei
DOI:10.1021/jacs.7b01232
日期:2017.3.1
Palladium-catalyzed C-H activation/C-O bond-forming reactions have emerged as attractive tools for organic synthesis. Typically, these reactions require strong chemical oxidants, which convert organopalladium(II) intermediates into the PdIII or PdIV oxidation state to promote otherwise challenging C-O reductive elimination. However, previously reported oxidants possess significant disadvantages, including
钯催化的 CH 活化/CO 键形成反应已成为有机合成的有吸引力的工具。通常,这些反应需要强化学氧化剂,将有机钯 (II) 中间体转化为 PdIII 或 PdIV 氧化态,以促进其他具有挑战性的 CO 还原消除。然而,先前报道的氧化剂具有显着的缺点,包括原子经济性差、成本高和形成不需要的副产物。为了克服这些问题,我们报告了一种电化学策略,该策略利用 PdII 的阳极氧化与各种氧阴离子偶联伙伴诱导选择性 CO 还原消除。
Merging alkenyl C–H activation with the ring-opening of 1,2-oxazetidines: ruthenium-catalyzed aminomethylation of enamides
作者:Song Li、Qi-Chao Shan、Lu-Min Hu、Xue-Qing Ma、Xu-Hong Hu
DOI:10.1039/d0cc03081c
日期:——
1,2-Oxazetidines have been utilized as formaldimine precursors for the direct aminomethylation of enamides under a Ru(II) species. By merging alkenyl C–Hactivation with ring-opening of 1,2-oxazetidines, this efficient protocol provides a facile and novel approach to synthesize Z-selective aminomethyl substituted enamides. Furthermore, two exemplified synthetic elaborations highlight the potential