作者:Burkhard Costisella、Hans Gross
DOI:10.1016/0040-4020(82)85057-6
日期:1982.1
Alkylation of 1-dimethylamino-1-cyanomethanephosphonic acid diethyl ester (8), easily obtainable from diethyl phosphite and the 0,N-acetal 9, yields 1-alkyl derivatives 14. Elimination of HCN converts 14 into 1-phosphonoenamines 6. Carbonyl compounds react with 8 to give 1-cyanoenamines 15 which may be hydrolyzed to from the homologous carboxylic acid. Alternatively, deprotonation of 15 yields the homoenolate
1-二甲基氨基-1-氰基甲烷膦酸二乙酯(8)的烷基化,可轻松地从亚磷酸二乙酯和0,N-乙缩醛9生成,生成1-烷基衍生物14。消除HCN可将14转化为1-膦烯胺6。羰基化合物与8反应生成1-氰基烯胺15,可以将其水解为同源羧酸。可选地,15的去质子化产生可以被烷基化或羟烷基化的均烯酸酯阴离子17,从而允许通过引入α-羧基和β-烷基而使羰基化合物的链增长。酸催化水解图8导致PC键的断裂,导致相应的α-二甲基氨基链烷酸。膦酸11可通过使用甲硅烷基酯法从8获得。氰基烯胺15的E / Z-异构体的明确分配是从13 C-NMR光谱中得出的。