某些烷基氰基和芳基氧基硫代羰基氯化物与氰化钾和喹啉或异喹啉可制得Reissert化合物(1和2; R CS·OEt和CS·OPh)。在核磁共振光谱中记录了硫代羰基对相应的羰基衍生物的显着脱屏蔽作用。尝试扩大与硫光气反应的尝试均未成功。相反,ø -isothiocyanato-反-cinnamaldehyde(5)和3-氧代咪唑并[1,5, -一个]喹啉(6)从喹啉获得,硫光气,和氰化钾。醛的较高产率是由氢氧根离子代替氰化物。o的顺式异构体当使用碳酸钡作为碱时,得到-异硫氰酸根合肉桂醛(12)。从异喹啉和吡啶获得了类似的异硫氰酸根合甲酰基环裂变产物(13),(20)和(21)。在异喹啉反应中也获得了二异喹啉基-1,3,5-恶二嗪(16)。
Reactions of heterocycles with thiophosgene. Part III. 5-Isothiocyanatopenta-trans-2,cis-4-dienal, a product obtained from pyridine
作者:Francis T. Boyle、Roy Hull
DOI:10.1039/p19740001541
日期:——
Pyridine undergoes ring scission when treated with thiophosgene and barium carbonate to give the products of both kinetic and thermodynamic control, i.e. the trans,cis- and trans,trans-5-isothiocyanatopenta-2,4-dienals, respectively. The reactions of the trans,cis-diene (1) with a wide variety of nucleophiles invariably give thioamides and anils. There was no evidence of any cyclisation to 1,2-dih