Direct Enamido C(sp<sup>2</sup>)−H Diphosphorylation Enabled by a PCET‐Triggered Double Radical Relay: Access to<i>gem</i>‐Bisphosphonates
作者:Hao‐Qiang Cao、Hao‐Nan Liu、Zhe‐Yuan Liu、Bao‐Kun Qiao、Fa‐Guang Zhang、Jun‐An Ma
DOI:10.1002/chem.202000517
日期:2020.4.24
electron-transfer (PCET)-triggered enamidoC(sp2 )-Hdiphosphorylation. This reaction represents a rare example of realizing the challenging double C-P bond formation at a single carbon atom, thus providing facile access to a broad variety of structurally diverse bisphosphonates from simple enamides under silver-mediated conditions. Initial mechanistic studies demonstrated that the diphosphorylation involves
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
Iron-Catalyzed Carbamoylation of Enamides with Formamides as a Direct Approach to <i>N</i>-Acyl Enamine Amides
作者:Zhen-Yao Shen、Jun-Kee Cheng、Cong Wang、Chao Yuan、Teck-Peng Loh、Xu-Hong Hu
DOI:10.1021/acscatal.9b02635
日期:2019.9.6
of enamides with formamides is described. Routing from readily accessible feedstocks, the efficient approach is implemented to furnish a broad array of value-added N-acyl enamine amide derivatives, which serve as versatile precursors of biologically relevant N-heterocycles including pyrimidin-4-ones and 4-hydroxypyridin-2-ones. Preliminary mechanistic studies supported the notion that this direct carbamoylation