2-Mercapto-4-methyl-5-thiazoleacetic acid

white to light yellow crystal powde

Add 100kg of levulinic acid and 1000L of carbon tetrachloride to the reactor.After adding 176 kg of sodium bromide and stirring, slowly add 260 kg of hydrogen peroxide solution.Heat to 60°C for 2.5 hours, add water to wash, and separate organic phase.The aqueous phase treats the wastewater. To the organic phase, 75 kg of ammonium dithiocarbamate, 1000 kg of water, and 22 kg of sodium carbonate were directly added for the cyclization reaction.The aqueous phase is acidified with pH=1.5, obtaining2-mercapto-4-methyl-5-thiazoleacetic acid 132 kg, purity 99.92percent, Yield 80.99percent.The method for synthesizing 2-mercapto-4-methyl-5-thiazole acetic acid of the cefodizime sodium intermediate of the present invention includes the following stepsStep:(1) In a 1000 mL three-vial bottle, Into 660.0 g of ethylenediamine as a solvent, 110.0 g of ammonium dithiocarbamate was added.Control temperature at 25 °C; start to add methyl 3-chlorolevulinate164.0g, The temperature rose to 34.8°C after the addition was completed;When 20min, the addition was completed stirring at 35 °C 24h;(2) Add 19.8g of activated carbon to absorb and decolorize for 0.5h. After filtration and precision filtration, slowly reduce the filtrate at 60°C.Pressure distillation(3) The distilled solid was washed with 1000 ml of water for 0.5 h. After washing, the solid was obtained by filtration at 65°C.After drying under vacuum for 24 h, a total of 169.8 g of product was obtained. The yield was 61.1percent and the purity was 99.8percent.

Molecular Weight:189.3
XLogP3:0.7
Hydrogen Bond Donor Count:2
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:2
Exact Mass:188.99182081
Monoisotopic Mass:188.99182081
Topological Polar Surface Area:107
Heavy Atom Count:11
Complexity:247
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes