1006-23-1Relevant articles and documents
Synthetic method of triamterene intermediate
-
Paragraph 0015-0017, (2021/07/28)
The invention improves a synthesis method of triamterene from an intermediate to a triamterene finished product. The method adopts guanidine hydrochloride as a starting material to prepare 5-nitroso-2, 4, 6-triaminopyrimidine, and comprises the following steps: (1) sequentially adding water and malononitrile into a reaction kettle, stirring for 25 minutes for dissolving, starting nitrogen protection, adding a sodium nitrite saturated solution at 20 DEG C, dropwise adding 8% HCl at the same time for adjusting the pH value to 3-4, after the sodium nitrite aqueous solution is dropwise added, keeping the temperature for 2.5 hours at 18 DEG C, wherein the dosage weight ratio of the water to the sodium nitrite to the malononitrile to the 8% hydrochloric acid is as follows: the use mass ratio of the sodium nitrite to the malononitrile to the 8% hydrochloric acid is 2.5:1.15:1:0.35; and (2) adding guanidine hydrochloride solid into the solution obtained in the step (1), and stirring for 30 minutes, and adding NaCO3 solid to adjust the pH value to 9-10, wherein the weight ratio of guanidine hydrochloride to sodium carbonate to malononitrile in (1) is as follows: guanidine hydrochloride to malononitrile to sodium carbonate is 1.60:1:(0.10-0.12). According to the method, the synthesis risk of the triamterene intermediate is reduced, wastewater generated in the refining process is reduced, and safe production, energy conservation and emission reduction are facilitated.
Imidazopyridine- and purine-thioacetamide derivatives: Potent inhibitors of nucleotide pyrophosphatase/phosphodiesterase 1 (NPP1)
Chang, Lei,Lee, Sang-Yong,Leonczak, Piotr,Rozenski, Jef,De Jonghe, Steven,Hanck, Theodor,Müller, Christa E.,Herdewijn, Piet
, p. 10080 - 10100 (2015/02/05)
Nucleotide pyrophosphatase/phosphodiesterase 1 (NPP1) belongs to the family of ecto-nucleotidases, which control extracellular nucleotide, nucleoside, and (di)phosphate levels. To study the (patho)physiological roles of NPP1 potent and selective inhibitors with drug-like properties are required. Therefore, a compound library was screened for NPP1 inhibitors using a colorimetric assay with p-nitrophenyl 5′-thymidine monophosphate (p-Nph-5′-TMP) as an artificial substrate. This led to the discovery of 2-(3H-imidazo[4,5-b]pyridin-2-ylthio)-N-(3,4-dimethoxyphenyl)acetamide (5a) as a hit compound with a Ki value of 217 nM. Subsequent structure-activity relationship studies led to the development of purine and imidazo[4,5-b]pyridine analogues with high inhibitory potency (Ki values of 5.00 nM and 29.6 nM, respectively) when assayed with p-Nph-5′-TMP as a substrate. Surprisingly, the compounds were significantly less potent when tested versus ATP as a substrate, with Ki values in the low micromolar range. A prototypic inhibitor was investigated for its mechanism of inhibition and found to be competitive versus both substrates.
Preparation of 2,4,5,6-tetraaminopyrimidine from 2,4,6-triaminopyrimidine
-
, (2008/06/13)
An improved process for the production of STR1 FROM STR2 WHICH PRODUCES BUT DOES NOT ISOLATE AN INTERMEDIATE STR3 WHICH COMPOUND IS RETAINED IN SITU AND MINIMIZES THE COMPLEX POLYMER FORM OF A THREE-DIMENSIONAL NETWORK OF AZO LINKAGES FORMED BY THE NITROSO AND AMINO GROUPS. These groups, as they appear in the nitroso intermediate, have carcinogenic possibilities. It has been found that the nitroso compound will precipitate as a stirrable slurry if the temperature parameter is kept low at about 0°-20° C. A preferred route for the production of the nitroso compound from the triamino starting material utilizes as reactants 1.0-1.05 moles of sodium nitrite and 1.5 moles of HOAc in water (HCl may be substituted for HOAc). In the second state of this sequential reaction, the reduction of nitroso is carried out by a reducing agent and one preferred agent is sodium dithionite. Catalytic agents such as Raney nickel and hydrazine or nickel salts, e.g., nickel chloride, and sodium borohydride may also be used. The present process is an improvement in part of the technique of Piper and Montgomery, J. Het. Chem., 11:279 (1974), which process is designed specially to produce the antifolate methotrexate as an end product and is an improvement of the method of application Ser. No. 742,450 of Ellard filed Nov. 17, 1976, entitled "Improved Synthesis of Methotrexate", U.S. Pat. No. 4,080,825.