| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | methyl 1-(dimethylcarbamoyl)piperidine-4-carboxylate | —— | C10H18N2O3 | 214.265 |
| 1-(二甲基氨基甲酰)哌啶-4-羧酸乙酯 | ethyl 1-(N,N-Dimethylcarbamoyl)-4-piperidinecarboxylate | 333985-78-7 | C11H20N2O3 | 228.291 |
Betaines 7a, b and 8a, b have been prepared from 3- and 4-piperidinecarboxylic acid and N,N,N',N'-tetraalkyl-chloroformamidinium chlorides via the corresponding methyl esters. These betaines are highly hygroscopic, thermally very stable, and, with the exception of 7b, have rather low melting points. They undergo a surprisingly facile alkaline cleavage of the hexaalkylguanidinium moiety. They react with dichloromethane by a twofold nucleophilic substitution to form methylene dicarboxylates such as 11. TheNMR (1H, 13C) data of betaines 7 and 8 are discussed