Synthesis of 1,4,5-trisubstituted triazoles by [3+2] cycloaddition of a ruthenium azido complex with ynoate esters
作者:Chao-Wan Chang、Gene-Hsiang Lee
DOI:10.1016/j.jorganchem.2019.06.013
日期:2019.9
[Ru]N3C2(CO2Me)(Ph) (4) and [Ru]N3C2(CO2Et)(CH3) (5) were produced from diethyl acetylene dicarboxylate, ethyl 4,4,4-trifluoro-2-butynoate, methyl phenylpropiolate and ethyl 2-butynoate, respectively. The complexes were all structurally characterized as being N(2)-bound. The alkylation of 2 with organic halides resulted in the cleavage of the Ru−N bond and the formation of a series of 1-alkylated-4,5-bis(ethoxycarbonyl)-1
的[3 + 2]与叠氮基钌配合物的一系列炔酸甲酯的酯的环加成反应的[Ru] -N 3(1,[茹] =(η 5 -C 5 H ^ 5)(DPPE)钌,DPPE =苯基2研究了PCH 2 CH 2 PPh 2)。反应产物,与金属结合的杂环配合物,例如三唑并配合物[Ru] 3 C 2(CO 2 Et)2(2),[Ru] 3 C 2(CO 2 Et)(CF 3)(3) ,[Ru] N 3C 2(CO 2 Me)(Ph)(4)和[N] 3 C 2(CO 2 Et)(CH 3)(5)由乙炔二甲酸二乙酯,4,4,4-三氟-2乙酯制得-丁酸,苯丙酸甲酯和2-丁酸乙酯。复杂的结构都被表征为N(2)绑定。2与有机卤化物的烷基化导致Ru-N键断裂并形成一系列1-烷基化的4,5-双(乙氧基羰基)-1,2,3-三唑N 3(CH 2 R )C 2(CO 2 Et)2(6a,R = H;6b,R = C 6 F 5;R