Lithiated (E)-N-isopropyl-5-tosyl-4-pentenamide: Synthetic applications as new δ-acyldienyl anion equivalent
作者:Francisco Caturla、Carmen Nájera
DOI:10.1016/s0040-4020(98)00658-9
日期:1998.9
dilithiated lactam 25. After reaction with aldehydes and propylene oxide or alkyl halides (2E,4E)-6-hydroxy and 7-hydroxy-2,4-hexadienamides 15 and 21 or alkylated dienamides 18 and 20 are stereoselectively obtained, respectively. In the case of carboxylic acid chlorides or cyclohexyl isocyanate, dilithiated lactam 25 undergoes acylation to afford the corresponding lactam derivatives 22. The 6-hydroxy-2
由4-戊烯酸经立体选择性碘磺酰化-脱氢碘化并进一步酰胺化制得的乙烯基砜(E)-N-异丙基-5-甲苯基-4-戊烯酰胺(14)在-78°C下与两个当量的正丁基锂反应大概得到二片式内酰胺25。与醛和环氧丙烷或烷基卤反应后,分别立体选择得到(2 E,4 E)-6-羟基和7-羟基-2,4-己二酰胺15和21或烷基化的二烯酰胺18和20。在羧酸氯化物或异氰酸环己酯的情况下,二锂化内酰胺25进行酰化反应以提供相应的内酰胺衍生物22。6-羟基-2,4-二烯酰胺15f已通过氧化转化为6-氧代-2,4-二酰胺41,或通过溴化反应已转化为(2 E,4 E,6 E)-三烯酰胺42。