{"id":5226,"date":"2021-07-08T03:19:33","date_gmt":"2021-07-07T19:19:33","guid":{"rendered":"https:\/\/www.pyrazoles-derivatives.com\/?p=5226"},"modified":"2021-07-08T03:19:33","modified_gmt":"2021-07-07T19:19:33","slug":"analyzing-the-synthesis-route-of-c4h5n3o2-2","status":"publish","type":"post","link":"https:\/\/www.pyrazoles-derivatives.com\/?p=5226","title":{"rendered":"Analyzing the synthesis route of C4H5N3O2"},"content":{"rendered":"

Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 3994-50-1, name is 1-Methyl-4-nitro-1H-pyrazole, A new synthetic method of this compound is introduced below., Quality Control of 1-Methyl-4-nitro-1H-pyrazole<\/a><\/p>\n

Example 1 5-chloro-1-methyl-4-nitro-1H-pyrazole [0177] 4-nitro-1-H-pyrazole (5 g, 44.2 mmol) was added sodium hydroxide (1M, 200 mL) and dimethyl sulfate (31 mL, 330 mmol). The mixture was stirred at room temperature for 72 h and the mixture was extracted with CH2Cl2 (2\u00d7150 mL). The organic layer was separated and the solvent was distilled off to yield 1-methyl-4-nitro-1H-pyrazole as a white solid (4.30 g, 76%). [0179] Following WO 2007\/99326, to a 500 mL 3-neck-round bottom flask was added 1-methyl-4-nitro-1H-pyrazole (4.30 g, 33.8 mmol) and THF (12 mL). The mixture was cooled to -78 C. and lithium hexamethyldisilazide in THF (1M, 88.4 mL, 90 mmol) was added dropwise via an addition funnel over 20 min. The brown mixture was stirred for 30 min and warmed to -45 C. over 30 min. The mixture was cooled back down to -78 C. and hexachloroethane (10.5 g, 44.2 mmol) dissolved in THF (20 mL) was added via an addition funnel over 15 min. The mixture was stirred for 2.5 h, warmed from -78 C. to -40 C. and the reaction was monitored by LCMS. Upon completion of the reaction, the reaction was quenched with a solution of saturated NH4Cl (150 mL), and ethyl acetate (100 mL) was added. The organic layer was separated and the aqueous layer was extracted with ethyl acetate (100 mL). The combined organic layer was washed with water (150 mL), dried over Na2SO4 and the organic solvent was distilled off. The crude product was purified via flash chromatography (CH2Cl2\/7% MeOH) to yield 5-chloro-1-methyl-4-nitro-1H-pyrazole as a white solid (1.40 g, 20%). 1H NMR (400 MHz, CDCl3) delta 8.13 (s, 1H), 3.92 (s, 3H); ESIMS m\/z=162.0 (M+1)<\/p>\n

The synthetic route of 3994-50-1 has been constantly updated, and we look forward to future research findings.<\/p>\n

Reference:
Patent; GENENTECH, INC.; Hodges, Alastair James; Matteucci, Mizio; Sharpe, Andrew; Sun, Minghua; Wang, Xiaojing; Tsui, Vickie H.; US2013\/79321; (2013); A1;<\/a>,
Pyrazole – Wikipedia<\/a>,
Pyrazoles – an overview | ScienceDirect Topics<\/p>\n","protected":false},"excerpt":{"rendered":"

The synthetic route of 3994-50-1 has been constantly updated, and we look forward to future research findings.<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[261,131],"tags":[126],"class_list":["post-5226","post","type-post","status-publish","format-standard","hentry","category-3994-50-1","category-pyrazoles-derivatives","tag-m-w100-200"],"yoast_head":"\nAnalyzing the synthesis route of<\/title>\n<meta name=\"description\" content=\"Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. 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