In order to investigate a new type of promoiety for ampicillin prodrugs, acyloxyallyl esters were prepared and their oral absorbabilities, stabilities and hydrolyzabilities to parent ampicillin were studied. As starting materials for (3-phthalidylidene)ethyl esters, ethylidenephthalide and its derivatives were regiospecifically prepared by a new method using the Wittig reaction. (3-Phthalidylidene)ethyl esters (14a-c) given orally were well absorbed, but (thiophthalidylidene)ethyl ester (14d) and (isocoumarin-4-yl)methyl ester (14e) were poorly absorbed.
为了研究
氨苄西林前药的新型亲电载体,制备了乙酰氧基烯丙基酯,并研究了它们的口服吸收性、稳定性和对母体
氨苄西林的
水解能力。以(3-邻苯二甲
酰亚胺基)乙基酯为起始材料,通过新的Wittig反应方法选择性地合成了亚乙基
邻苯二甲酸酯及其衍
生物。口服给予(3-邻苯二甲
酰亚胺基)乙基酯(14a-c)吸收良好,但(
硫邻苯二甲
酰亚胺基)乙基酯(14d)和(异
香豆素-4-基)甲基酯(14e)吸收不良。