1,2,4-Benzothiadiazine 1,1-Dioxides, Part 4: Mitsunobu Reactions of 3-Hydroxyalkylamino- and 3-Mercaptoalkylamino-4<i>H</i>1, 2,4-benzothiadiazine 1,1-Dioxides. A Convenient Synthesis of Built-in Guanidine Tricycles and Disulfides
作者:Ji-Wang Chern、Chia-Yang Shiau、Ying-Hwa Wu
DOI:10.1055/s-1991-26404
日期:——
3-(2-Hydroxyethyl)amino- and 3-(3-hydroxypropyl)amino-4H-1,2,4-benzothiadiazine 1,1-dioxides (1a, b) were treated with triphenylphosphine in the presence of diethyl azodicarboxylate leading to the formation of 2,4-dihydro-1H-imidazo[2,1-c] [1,2,4]benzothiadiazine 5,5-dioxide (3a) and 1,2,3,5-tetrahydropyrimido[2,1-c][1,2,4]benzothiadiazine 6,6-dioxide (3b) in 94 % and 60 % yield, respectively. However, under the same conditions, the oxidized products bis[2-(1,1-dioxo-4H-1,2,4-benzothiadiazin-3-ylamino)ethyl] disulfide (6a) and bis[2-(1,1-dioxo-4H-1,2,4-benzothiadiazin-3-ylamino)propyl] disulfide (6b) were obtained from 3-(2-mercaptoethyl)amino- and 3-(3-mercaptopropyl)amino-4H-1,2,4-benzothiadiazine 1,1-dioxides (5a, b)
3-(2-羟乙基)氨基-和3-(3-羟丙基)氨基-4H-1,2,4-苯并噻二嗪1,1-二氧化物(1a, b)在偶氮二甲酸二乙酯存在下与三苯基膦反应,分别以94%和60%的产率生成2,4-二氢-1H-咪唑并[2,1-c][1,2,4]苯并噻二嗪5,5-二氧化物(3a)和1,2,3,5-四氢嘧啶并[2,1-c][1,2,4]苯并噻二嗪6,6-二氧化物(3b)。然而,在相同条件下,3-(2-巯乙基)氨基-和3-(3-巯丙基)氨基-4H-1,2,4-苯并噻二嗪1,1-二氧化物(5a, b)可生成氧化产物二[2-(1,1-二氧代-4H-1,2,4-苯并噻二嗪-3-基氨基)乙基]二硫醚(6a)和二[2-(