Alkylation of the aza-enolate of valerolactim methyl ether with electrophiles affords α-alkyl lactims that may be hydrolysed under mild acidic conditions to afford their corresponding α-alkyl-δ-amino esters as their hydrochloride salts. Neutralisation of these salts with base results in smooth intramolecular cyclisation to afford their corresponding α-alkyl lactams in excellent yield.
缬草内脂
甲醚的偶氮烯醇与亲电体发生烷基化反应,产生δ-烷基内酰胺,在弱酸性条件下进行
水解,可得到相应的δ-烷基-δ-
氨基酯盐酸盐。用碱中和这些盐后,可顺利进行分子内环化,从而以极好的收率得到相应的δ-烷基内酰胺。