The Preparation of Some Substituted Thiohydantoins and Thioimidazoles
作者:Mary Jackman、Mabel Klenk、B. Fishburn、B. F. Tullar、S. Archer
DOI:10.1021/ja01189a015
日期:1948.9
It has been shown that proper substitution a t the six position in 2-thiouracil resulted in increased antithyroid activity.' Astwood showed that 2thiohydantoin was half and 2-thioimidazole one and one half times as active as 2-thiouracil in goitrogenic potency.2 It seemed likely then that appropriately substituted thiohydantoins and thioimidazoles would show greater activity than the parent heterocycles
The present invention provides a method of making an imidazole-2-thione which comprises the steps of reacting a vicinal diamine with a compound having a thiocarbonyl moiety and oxidizing the resulting reaction product to obtain said imidazole-2-thione.
Unsubstituted and substituted 4-benzyl-1,3-dihydro-imidazole-2-thiones acting as specific or selective alpha2 adrenergic agonists and methods for using the same
申请人:Heidelbaugh M. Todd
公开号:US20060069142A1
公开(公告)日:2006-03-30
Compounds of Formula 1
where the variables have the meaning defined in the specification are used to activate alpha
2
adrenergic receptors. The compounds of Formula 1 are incorporated in pharmaceutical compositions and are used as medicaments in mammals, including humans, for treatment of diseases and or alleviations of conditions which are responsive to treatment by agonists of alpha
2
adrenergic receptors.
Various 2-mercapto-4-substituted-5-imidazolecarboxylates (5) were synthesized by the reaction of C-acylamino acid methyl esters (4) with potassium thiocyanate. Hydrolysis followed by decarboxylation of the imidazole carboxylates (5) gave 2-mercapto-4-substituted imidazoles (8) in good yields. Furthermore, the imidazoles (8) were also directly obtained by the reaction of aminoketones (9) with potassium thiocyanate. These compounds (8) exhibited antiinflammatory activities against carrageenan-induced rat paw edema. Among the compounds tested, 2-mercapto-4-(3-thienyl) imidazole (8r) showed the best therapeutic index value, giving a value comparable to that of mefenamic acid.
SYNTHESIS OF IMIDAZOLE 2-THIONES VIA THIOHYDANTOINS
申请人:Garst E. Michael
公开号:US20070203344A1
公开(公告)日:2007-08-30
The present invention provides a method of making an imidazole 2-thione which comprises the step(s) of reducing a thiohydantoin to said imidazole-2-thione.