2,3,4,9-tetrahydro-1H-carbazole-7-carboxylic acid(SALTDATA: FREE) synthesis
- Product Name:2,3,4,9-tetrahydro-1H-carbazole-7-carboxylic acid(SALTDATA: FREE)
- CAS Number:729613-71-2
- Molecular formula:C13H13NO2
- Molecular Weight:215.25
108-94-1
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38235-71-1
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729613-71-2
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Yield:729613-71-2 39%
Reaction Conditions:
with hydrogenchloride in water;acetic acid; for 3 h;Reflux;
Steps:
2 Step 2: Preparation of 2,3,4,9-tetrahydro-1 H-carbazole-7-carboxylic acid
To a stirred suspension of 3-hydrazinylbenzoic acid (200 mg, 1 .32 mmol) in acetic acid was added cyclohexanone (129 mg, 1 .32 mmol) and cone. HCI. The mixture was heated at reflux for 3 hours and cooled to room temperature. The resultant was concentrated directly in vacuum to remove acetic acid, the residue was washed with water and extracted with ethyl acetate, and the organic layer was extracted with 2 N NaOH solution. The alkaline layers were made acidic by the addition of 2 N HCI, extracted with diethyl ether, dried and concentrated to give a crude product, which was purified by column chromatography on silica gel to give 2,3,4,9-tetrahydro-1 - - carbazole-7-carboxylic acid as a pale solid (1 10 mg, 39%). 1 H NMR (400 MHz, DMSO-d6): δ 12.36 (s, 1 H), 1 1.04 (s, 1 H), 7.88 (s, 1 H), 7.55 (d, J = 9.2 Hz, 1 H), 7.38 (d, J = 8.4 Hz, 1 H), 2.73 (t, J = 4.8 Hz, 2H), 2.64 (t, J = 4.8 Hz, 2H), 1 .84-1 .81 (m, 4H).
References:
WO2016/8010,2016,A1 Location in patent:Page/Page column 38; 39
108-94-1
528 suppliers
$12.00/50g
38235-71-1
139 suppliers
$41.00/5g
729613-71-2
20 suppliers
$45.00/10mg
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99-05-8
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822-87-7
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729613-71-2
20 suppliers
$45.00/10mg