Rhodium(III)-Catalyzed Direct C–H Arylation of Various Acyclic Enamides with Arylsilanes
作者:Xiaolan Li、Kai Sun、Wenjuan Shen、Yong Zhang、Ming-Zhu Lu、Xuzhong Luo、Haiqing Luo
DOI:10.1021/acs.orglett.0c03578
日期:2021.1.1
The stereoselective β-C(sp2)–H arylation of various acyclic enamides with arylsilanes via Rh(III)-catalyzed cross-coupling reaction was illustrated. The methodology was characterized by extraordinary efficacy and stereoselectivity, a wide scope of substrates, good functional group tolerance, and the adoption of environmentally friendly arylsilanes. The utility of this present method was evidenced by
Access to multi-functionalized oxazolines via silver-catalyzed heteroannulation of enamides with sulfoxonium ylides
作者:Rui-Hua Liu、Qi-Chao Shan、Ya Gao、Teck-Peng Loh、Xu-Hong Hu
DOI:10.1016/j.cclet.2020.10.007
日期:2021.4
efficient Ag-catalyzed [4 + 1] heteroannulation reaction of enamides with α-carbonyl sulfoxonium ylides. The diastereoselective transformation provides a practical access to a diverse range of multi-functionalized oxazoline derivatives. The synthetic utility of the resultant tetra-substituted oxazolines is further demonstrated by a series of useful manipulations into valuable building blocks of pharmaceutical
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
reaction proceeds in the presence of CO, thus providing a synthesis for 1,3‐oxazin‐6‐ones (see scheme; DABCO=1,4‐diazabicyclo[2.2.2]octane, DMF=N,N‐dimethylformamide). The reaction tolerates a variety of functional groups on both the aryl ring and the amide of the substrate. Initial mechanistic studies suggest the activation of the alkenylCH bond to be a key step.