鬼臼毒素类的化学与抗肿瘤活性研究——Ⅸ.4-(芳甲亚胺基)及4-烷胺基-4-脱氧-4′-去甲表鬼臼毒素衍生物的合成和抗肿瘤活性

本文为鬼臼毒素的化学和抗肿瘤活性研究的一部分,设计合成和筛选了4-(芳甲亚胺基)(Ⅰ)及4-烷胺基-4-脱氧-4′-去甲表鬼臼毒素衍生物(Ⅱ)22个。(Ⅰ)对KB细胞的抑制活性普遍较依托泊甙(VP-16)强。(Ⅱ)中(Ⅱ_1)及(Ⅱ_8)对L_(1210)的抑制活性与依托泊甙相当,但对KB细胞活性较依托泊甙弱。

微波促进下3-(2-苯并呋喃基)-4-氨基-5-巯基-1,2,4-三唑及其衍生物的合成

微波辐射条件下,首先由2-苯并呋喃甲酰肼依次与二硫化碳和水合肼反应合成3-(2-苯并呋喃基)-4-氨基-5-巯基-1,2,4-三唑,进一步在微波辐射条件下由4-氨基-5-巯基-1,2,4-三唑分别与芳甲酸/芳氧基乙酸、α-溴代苯乙酮及芳醛反应以较高产率制得了相应的1,2,4-三唑并[3,4-b]-1,3,4-噻二唑、1,2,4-三唑并[3,4-b]-1,3,4-噻二嗪及4-芳亚甲基亚胺基-5-巯基-1,2,4-三唑.产物结构经IR,1HNMR,MS及元素分析进行了表征.

Catalytic Hydrogenation of Aromatic Compounds in the Liquid Phase

Peculiarities of a liquid phase hydrogenation, namely lower diffusivity of components influencing the reaction rate and deactivation of catalysts by leaching, are discussed. A focus is on hydrogenation of aromatic compounds, whereas the following processes are evaluated： （l） partial hydrogenation of benzene to cyclohexene; （2） hydrogenation of aniline; （3） hydrogenation of diphenylamine; （4） preparation of aniline from nitrobenzene; （5） hydrogenation of chloronitrobenzenes; （6） hydrogenation of 4-nitrosodiphenylamine and 4-nitrodiphenylamine mixture. Processes （1） and （6） are typically carried out in the water-oil system. Generally, this type of system allows reaching a higher selectivity to desired products. In the case of hydrogenation of 4-nitrosodiphenylamine and 4-nitrodiphenylamine mixture, the water phase extracts a water soluble catalyst; which is recycled and used for condensation of aniline and nitrobenzene. Problems of reaction kinetics, as well as catalysts deactivation are here discussed.