作者:Augusto C. Veronese、Elisa Durini、Valerio Bertolasi、Marino Basato、Cristina Tubaro
DOI:10.1016/j.tet.2010.07.070
日期:2010.10
The reactions of β,β′-tricarbonyl derivatives with isocyanates are catalysed by 2 mol % transition metal acetylacetonates (e.g., [Co(acac)2] and [Zn(acac)2]) at room temperature. 3-Oxo-1,5-pentanedioic acid dimethylester (1) reacts with RNCO (R=Et, CH2CHCH2, CH2Ph, Ph, 4-Cl–Ph) to give 1:1 adducts involving the formation of a new C–C bond between the intercarbonylic methylene and the isocyanato group
在室温下,β,β'-三羰基衍生物与异氰酸酯的反应由2摩尔%的过渡金属乙酰丙酮化物(例如[Co(acac)2 ]和[Zn(acac)2 ])催化。3-Oxo-1,5-戊二酸二甲酯(1)与RNCO(R = Et,CH 2 CH CH 2,CH 2 Ph,Ph,4-Cl-Ph)反应,生成1:1的加合物,涉及到羰基间亚甲基和异氰酸酯基之间有一个新的CC键。在相似的条件下,2,4,6-庚烷三酮(2)与相同的异氰酸酯反应,得到由不稳定的1:1和1:2加合物环化产生的吡啶酮和吡喃酮衍生物。