5-(4-Fluoro-phenyl)-1-methyl-1,2-dihydropyrazol-3-one synthesis
- Product Name:5-(4-Fluoro-phenyl)-1-methyl-1,2-dihydropyrazol-3-one
- CAS Number:623577-33-3
- Molecular formula:C10H9FN2O
- Molecular Weight:192.19
Yield:623577-33-3 55%
Reaction Conditions:
with water in methanol at 20 - 60;
Steps:
A
To a solution of methyl 4- (fluorophenyl) propynoate (J. Org. Chem. 1987,52 (16), 3662-8) (13g, 73mmol) in methanol (60ML) was added water (60ML) followed by methylhydrazine (4ML, 77mmol), the mixture was stirred for 6hrs at 60°C then left to stand overnight. The solid was filtered and washed with water then a minimum volume of methanol and dried overnight, affording 7.7g OF 5- (4-FLUOROPHENYL)-1- METHYL-1, 2-dihydropyrazol-3-one (55%). 8 (LH, 500MHZ, CDC13) 3.68 (3H, s), 5.68 (1H, s), 7.13-7. 17 (2H, m), 7.37-7. 40 (2H, m).
References:
WO2004/39370,2004,A1 Location in patent:Page/Page column 15
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