Application of 4928-88-5, New Advances in Chemical Research in 2021. The prevalence of solvent effects in heterogeneous catalysis in condensed media has motivated developing quantitative kinetic,A common heterocyclic compound, 4928-88-5, name is Methyl 1H-1,2,4-triazole-3-carboxylate, molecular formula is C4H5N3O2, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, below Introduce a new synthetic route.
EXAMPLE 5 Preparation of Methyl 1-(2,3,5-tri-O-Acetyl-beta-L-ribofuranosyl)-1,2,4-triazole-3-carboxylate From Alpha-1,2,3,5-tetra-O-acetyl-L-ribofuranose [0047] A 250 mL flask was charged with [0048] 1.92 g of triazolemethylester and a solution of [0049] 4.8 g of the pure alpha-1,2,3,5-tetra-O-acetyl-L-ribofuranose, prepared in Example 4 in [0050] 50 mL of methyl acetate. The mixture was concentrated at atmospheric pressure to almost dryness (bath temperature: 90° C.). To this mixture was added a solution of [0051] 22.7 mg of triflic acid in 1 mL of methyl acetate. The mixture was stirred at 115+/-5° C. (pot temperature) under vacuum (30 mbar) for 4 h. Upon the completion of the reaction the mixture was cooled to 70° C. and to it was added [0052] 23 mL of 2B alcohol (ethyl alcohol). When a homogeneous solution was formed the mixture was cooled to 50° C. and held until heavy precipitation formed. The mixture was then slowly cooled to -5° C. (bath temperature) in 2 h and held for 13 h. The solid was filtered, washed with [0053] 20 mL of cold 2B Alcohol (ethyl alcohol), and dried under vacuum at 50° C. for 17 h to give 4.1 g (70percent yield) of methyl 1-(2,3,5-tri-O-acetyl-beta-L-ribofuranosyl)-1,2,4-triazole-3-carboxylate as an off-white solid.
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Reference:
Patent; Dong, Zhiming; Zhang, Pingsheng; US2004/34213; (2004); A1;,
1,2,3-Triazole – Wikipedia,
Triazoles – an overview | ScienceDirect Topics