Octahydro cyclopenteno [c] pyrroletetrazole derivative and preparation thereof
A technology of octahydrocyclopentene and pyrrole carboxylic acid, applied in the production of bulk chemicals, organic chemistry, etc., can solve problems such as unsatisfactory, and achieve the effect of easy industrial operation and simple process
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Embodiment 1
[0031] Preparation of (1S, 3aR, 6aS)-2-benzyloxycarbonyl-5-oxoctahydrocyclopenta[c]pyrrole-1-carboxylic acid methyl ester
[0032]
[0033] Step 1: Preparation of (S)-4-methylmercapto-2-(prop-2-ynylamino)butanoic acid methyl ester
[0034] Reaction formula:
[0035]
[0036] Steps:
[0037]Add No. 4 molecular sieves (240g) and lithium hydroxide monohydrate (41.7g, 993mmol) into N,N-dimethylformamide (460mL), stir at 0°C for 20 minutes; add (S)-4-form Mercapto-butyric acid methyl ester hydrochloride (92 g, 460 mmol), continued stirring at 0° C. for 45 minutes; 3-bromopropyne was added dropwise. The reaction mixture was stirred at room temperature for 28 hours, then filtered, the filtrate was washed with saturated brine, dried over anhydrous sodium sulfate, concentrated, and the residue was purified by column chromatography to obtain the product with a yield of 60%.
[0038] 1 H NMR (400MHz, CDCl 3 )δ: 1.85-2.03(m, 2H), 2.10(s, 3H), 2.23(dd, J=2.4, 2.4Hz, 1H), 2.36(br...
Embodiment 2
[0068] Preparation of (1S, 3aS, 6aR)-2-benzyloxycarbonyl-5-oxoctahydrocyclopenta[c]pyrrole-1-carboxylic acid methyl ester
[0069] The first step reaction: the preparation of (S)-2-benzyloxycarbonyl-5-oxoctahydrocyclopenta[c]pyrrole-1-carboxylic acid methyl ester
[0070] Reaction formula:
[0071]
[0072] (S)-methyl 2-((benzyloxycarbonyl)(propargyl)-amine)butene-3-carboxylate (1 g, 3.48 mmol) and cobalt carbonyl (0.16 g, 0.47 mmol) were dissolved in tetrahydrofuran ( 20 mL), carbon monoxide was introduced to maintain a pressure of 0.7 MPa, and the mixture was stirred at 135°C for 24 hours. After filtration, the filtrate was washed with saturated brine, dried over anhydrous sodium sulfate, concentrated, and the residue was purified by column chromatography to obtain the product with a yield of 30%.
[0073] 1 H NMR (400MHz, CDCl 3 )δ: 2.24(br, 1H), 3.60(br, 2H), 3.75(br, 3H), 4.20(br, 1H), 5.20(br, 2H), 5.38(m, 2H), 6.14(ddd, J = 6.2, 10.3, 17.0 Hz, 1H), 7.34-7.36 (m,...
Embodiment 3
[0083] Preparation of (1S, 3aR, 5S, 6aS)-2-benzyloxycarbonyl-5-hydroxyoctahydrocyclopenta[c]pyrrole-1-carboxylic acid methyl ester
[0084] Reaction formula:
[0085]
[0086] Steps:
[0087]Dissolve methyl (1S,3aR,6aS)-2-benzyloxycarbonyl-5-oxoctahydrocyclopenta[c]pyrrole-1-carboxylate (0.111 g, 0.35 mmol) in anhydrous methanol (5 mL) , added sodium borohydride (0.013 g, 0.35 mmol), under nitrogen protection, and stirred at 0° C. for 30 minutes. Add saturated ammonium chloride aqueous solution (10 mL) to stop the reaction, extract with ethyl acetate three times, combine the organic phases, wash with saturated brine, dry over anhydrous sodium sulfate, and concentrate to obtain the product with a yield of 95%.
[0088] 1 H NMR (400MHz, CDCl 3 )δ: 7.36-7.28 (m, 5H), 5.14-5.01 (m, 2H), 4.36-4.34 (m, 1H), 4.23 (m, 1H), 3.91-3.89 (m, 1H), 3.71-3.59 ( m, 7H), 2.69(br, 2H), 2.28-2.15(m, 2H), 1.68-1.62(m, 1H), 1.42-1.49(m, 1H), 1.30-1.28(m, 1H)
[0089] MS(ESI)m / e(M+H + ): 3...
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