Synthesis of 6-anilino-2-thiouracils and their inhibition of human placenta iodothyronine deiodinase
摘要:
Several 6-anilino-2-thiouracils were synthesized and tested for their ability to inhibit the inner-ring iodothyronine deiodinase from human placenta. The p-ethyl and p-n-butyl analogues were strongly inhibitory to the enzyme and were much more effective than the standard deiodinase inhibitor, 6-propyl-2-thiouracil. The degree of inhibition caused by 6-(p-n-butylanilino)-2-thiouracil was, moreover, unaffected by high concentrations of reducing agent in the enzyme assay. Attempts to prepare 3-alkyl derivatives via S-debenzylation of 2-benzylthio intermediates led to rearrangement to, for example, 3-methyl-5-benzyl-6-amino-2-thiouracil. This compound also strongly inhibited the deiodinase reaction. Preliminary results suggest that these compounds are useful to study in vitro and in vivo metabolism of thyroid hormones and may be clinically useful to enhance the availability of active thyroid hormones to certain organs.
hydrogenation protocol is free from the requirement for adding any auxiliary reagent to elicit the catalytic activity of the applied metal complex. Moreover, a containment system is not required for the assembly of the hydrogenation reaction set‐up as both the autoclave and the reaction vessels are readily charged under a regular laboratory atmosphere.
Phosphorus pentoxide in organic synthesis. XX. Synthesis of<i>N</i>-aryl-7<i>H</i>-pyrrolo[2,3-d]pyrimidin-4-amines
作者:Anker Jørgensen、Khairy A. M. El-Bayouki、Erik B. Pedersen
DOI:10.1002/jhet.5570220351
日期:1985.5
N-Aryl-7H-pyrrolo[2,3-d]pyrimidine-4-amines 7 were prepared in 30-67% yields by treating N7-(1-phenyl-ethyl)pyrrolo[2,3-d]pyrimidin-4(3H)-ones 2 with a mixture of phosphoruspentoxide, triethylamine hydrochloride, and an appropriate arylamine hydrochloride at 240° for 3-7 hours.
ñ -芳基- 7 ħ吡咯并[2,3- d ]嘧啶-4-胺7在30-67%的收率通过处理N7-(1-苯基-乙基)吡咯并[2,3制备d ]嘧啶4(3 H)-ones 2与五氧化二磷,三乙胺盐酸盐和适当的芳基胺盐酸盐的混合物在240°C搅拌3-7小时。
Co(dppbsa)-catalyzed reductive <i>N</i>,<i>N</i>-dimethylation of nitroaromatics with CO<sub>2</sub> and hydrosilane
A novel half-sandwich Co(dppbsa) ([Co]) was synthesized and employed for the catalytic N,N-dimethylation of nitroaromatics with CO2 and hydrosilane. The same catalyst also enabled the highly efficient reduction of nitroaromatics to aromatic amines.
Olefin polymerisation catalysts and processes for producing olefin polymers
申请人:TOSOH CORPORATION
公开号:EP0849292A1
公开(公告)日:1998-06-24
Catalysts for olefin polymerization which consist essentially of a transition metal compound, a modified clay compound and an organic aluminum compound, wherein the modified clay compound comprises a reaction product of a clay mineral and a proton acid salt of a specific amine compound, as well as a method of polymerizing olefins using such catalysts. It is possible thereby to obtain olefin polymers with high productivity and low ash content.
The compounds of the invention are compounds represented by the following general formula (1):
wherein E represents one selected from the group consisting of a methylidyne group and a nitrilo group, R1 represents one selected from the group consisting of optionally substituted aryl groups and optionally substituted heteroaryl groups, R2 represents one selected from the group consisting of a hydrogen atom and alkyl groups, W1 represents an amino acid residue, A represents one selected from the group consisting of a carbonyl group and a sulfonyl group, X1 represents one selected from the group consisting of optionally substituted alkylene groups and optionally substituted alkenylene groups, and p represents 0 or 1; and their pharmacologically acceptable salts, which exhibit thrombopoietin-like activity.