Contrasting Reactivity of CS<sub>2</sub>with Cyclic vs. Acyclic Amidines
作者:M. Trisha C. Ang、Lam Phan、Aliyah K. Alshamrani、Jitendra R. Harjani、Ruiyao Wang、Gabriele Schatte、Nicholas J. Mosey、Philip G. Jessop
DOI:10.1002/ejoc.201500973
日期:2015.11
to give an isothiocyanate and a thioacetamide. Because the pathway to that cleavage involves a rotation that is difficult for cyclic amidines, the reaction of CS2 with cyclic amidines produces an entirely different product: a cyclic carbamic carboxylic trithioanhydride structure. The path to that product involves sp3 C-H activation leading to the formation of a new C–C bond at a carbon α to the central
二氧化碳 (CO2) 和脒如 1,8-二氮杂双环 [5.4.0] 十一烷 (DBU) 之间的相互作用已被广泛研究,但除了单晶体学之外,等价 CS2 与此类碱的反应在很大程度上被忽略了报告。无环乙脒在室温下被 CS2 裂解,得到异硫氰酸酯和硫代乙酰胺。因为该裂解的途径涉及环脒难以进行的旋转,所以 CS2 与环脒的反应产生完全不同的产物:环状氨基甲酸三硫代酸酐结构。该产物的途径涉及 sp3 CH 活化,导致在脒基团中心碳的碳 α 处形成新的 C-C 键。