Method for preparing 5-(alpha-cyclopropyl carbonyl-2-fluorobenzyl)-2-oxo-2,4,5,6,7,7a-hexahydrothiophene [3,2-c] pyridine
A technology of cyclopropylcarbonyl and fluorobenzyl, applied in 5-(α-cyclopropylcarbonyl-2-fluorobenzyl)-2-oxo-2,4,5,6,7,7a-hexahydro In the field of preparation of thieno[3,2-c]pyridine, it can solve the problems of large-scale production danger, harsh reaction conditions, flammability and explosion of n-butyllithium, etc. mild effect
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Embodiment 1~2
[0039] Preparation of 5-benzyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridine (formula III):
[0040] 4,5,6,7-tetrahydrothieno[3,2-c]pyridine (7.0g), potassium carbonate (7.2g) and acetonitrile (50ml) were mixed, benzyl chloride (6.1g) was added, stirred for 0.5 After 3 hours it was refluxed for 3 hours. Cool, filter, concentrate the filtrate to dryness, add ethyl acetate (30ml) and water (50ml), separate the layers, extract the aqueous layer with ethyl acetate (30ml×2), combine the organic layers, wash with water, dry, and concentrate to dryness to obtain 8.3 g of the title compound 5-benzyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridine, yield 90.8%.
[0041] 4,5,6,7-tetrahydrothieno[3,2-c]pyridine (18.0g), potassium carbonate (18.6g), benzyl chloride (15.0g), sodium iodide (0.8g) in DMF ( 100ml) was stirred for 0.5 hours, then reacted at 80°C for 3 hours, cooled, added water (150ml) and ethyl acetate (100ml), separated, and the aqueous layer was extracted with ethyl acetate (50ml×2). ...
Embodiment 3
[0043] Preparation of 2-bromo-5-benzyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridine (formula IV):
[0044]The compound (23.2g) obtained in Example 2 was dissolved in acetic acid (100.0ml), 40% hydrobromic acid (75.0ml), methanol (100ml), and the methanol of 30% hydrogen peroxide (33.0ml) was added dropwise under ice-water bath cooling (100ml) solution, stirred at room temperature for 3 hours. Sodium thiosulfate solution (150ml) was added dropwise, then saturated sodium carbonate solution was added dropwise until the pH was 9, extracted with dichloromethane (100ml×3), the organic layers were combined, washed with water, dried, and concentrated to dryness to obtain 30.5g of light yellow solid , yield 97.8%.
Embodiment 4~6
[0046] Preparation of 2-methoxy-5-benzyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridine (Formula V):
[0047] Dissolve sodium (0.43g) in methanol (20ml), add 2-bromo-5-benzyl-4,5,6,7-tetrahydrothieno[3,2-c]pyridine (3.88g), bromide Cuprous (0.17g), stirred and refluxed for 12 hours. Cool, filter, concentrate the filtrate to dryness, add ethyl acetate (30ml) and water (50ml), separate the layers, extract the aqueous layer with ethyl acetate (30ml×2), combine the organic layers, wash with water, dry, and concentrate to dryness to obtain 3.3 g of oily matter was separated by column to obtain 1.3 g of the title compound, with a yield of 39.8%.
[0048] Dissolve sodium (5.6g) in methanol (120ml), concentrate to dryness, add tetrahydrofuran (100ml), 2-bromo-5-benzyl-4,5,6,7-tetrahydrothieno[3,2-c ] Pyridine (7.5g), cuprous bromide (0.34g) and sodium iodide (0.15g), stirred and refluxed for 24 hours. Cool, filter and wash with ethyl acetate, concentrate the filtrate to dryness, add ethyl...
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