Month: September 2021

Electric Literature of 6164-79-0, The chemical industry reduces the impact on the environment during synthesis 6164-79-0, name is Methyl 2-pyrazinecarboxylate, I believe this compound will play a more active role in future production and life.

(1) Pyrazine-2-carboxylic acid is fully dissolved in anhydrous methanol,Then add an appropriate amount of concentrated sulfuric acid and heat to reflux for 5 h.After the reaction is cooled, adjust the pH to neutral with saturated NaHCO3,Extract with dichloromethane and keep the dichloromethane layer,The solvent was removed by rotary evaporation to obtain an oily pyrazine-2-carboxylic acid methyl ester;After dissolving it in anhydrous methanol, hydrazine hydrate was added dropwise, and after heating under reflux for 21 h,Cool to room temperature, remove methanol by rotary evaporation to obtain pyrazine-2-hydrazide as a red solid product;The ratio of the amount of pyrazine-2-carboxylic acid methyl ester to the amount of hydrazine hydrate is 1: 2.

In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, Methyl 2-pyrazinecarboxylate, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Tianjin Medical University; Xu Jingyuan; Wang Zhigang; Xie Chengzhi; (13 pag.)CN110372681; (2019); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Electric Literature of 16298-03-6,Some common heterocyclic compound, 16298-03-6, name is Methyl 2-aminopyrazine-3-carboxylate, molecular formula is C6H7N3O2, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.

Methyl 2-amino-3-pyrazine carboxylate (2. 2 g) was dissolved in dry DCM (20 ml) to give a cloudy pale yellow solution, and pyridine (2 ml) in dry DCM (12 ml) was added. The stirred suspension was cooled in an ice bath, and 2,4, 6-trifluorophenylacetyl chloride (3.0 g) in dry DCM (13 ml) was added dropwise. The reaction gradually became a deep orange, and then went clear. It was stirred for 6 hours and stood overnight. The reaction mixture was washed with water, brine, and then dilute hydrochloric acid, and the DCM layer was dried over magnesium sulphate. The solvent was evaporated to yield an orange solid which was triturated with ether, to give methyl 2- [2, 4, 6-TRIFLUOROPHENYLACETYLAMINO]-3-PYRAZINE carboxylate as a yellow solid (1.5 g). LH NM : R (CDC13) 8 ppm: 4.03 (s, 5H), 6.74 (t, 2H), 8.43 (d, LH), 8.61 (d, LH) 10.9 (s, LH).

The synthetic route of 16298-03-6 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; SYNGENTA LIMITED; SYNGENTA PARTICIPATIONS AG; WO2004/56825; (2004); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem