Ethyl ether methylene chloride → n,n,1'-Trimethyl-2'-oxo-1',2,2',3-tetrahydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indole]-4'-carboxamide

HRID 1407925Notes

Reaction equation

[CH:1]1([NH:5][C:6]([C:8]2[C:9]3[C:10]4([C:30]5[C:21](=[CH:22][C:23]6[O:28][CH2:27][CH2:26][O:25][C:24]=6[CH:29]=5)[O:20][CH2:19]4)[C:11](=[O:18])[N:12]([CH3:17])[C:13]=3[CH:14]=[CH:15][CH:16]=2)=[O:7])CCC1.Cl[CH2:32]Cl.C(OCC)C>>[CH3:32][N:5]([CH3:1])[C:6]([C:8]1[C:9]2[C:10]3([C:30]4[C:21](=[CH:22][C:23]5[O:28][CH2:27][CH2:26][O:25][C:24]=5[CH:29]=4)[O:20][CH2:19]3)[C:11](=[O:18])[N:12]([CH3:17])[C:13]=2[CH:14]=[CH:15][CH:16]=1)=[O:7]

Participants

Reactant 2

HCID 21881112Ethyl ether methylene chloride

HCID 59352448n-Cyclobutyl-1'-methyl-2'-oxo-1',2,2',3-tetrahydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indole]-4'-carboxamide

Product 1

HCID 59352233n,n,1'-Trimethyl-2'-oxo-1',2,2',3-tetrahydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indole]-4'-carboxamideYield 37%

Procedure

Phenyl 1′-methyl-2′-oxo-1′,2,2′,3-tetrahydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indole]-4′-carboxylate (0.30 g, 0.70 mmol), cyclobutylamine hydrochloride (0.23 g, 2.1 mmol), potassium carbonate (0.39 g, 2.8 mmol) and N,N-dimethylformamide (3.0 mL) were added to a microwave reaction vessel. The reaction was heated at 110° C. for 1 h in a microwave reactor, allowed to cool to ambient temperature, poured into water (25 mL) and extracted with ethyl acetate (3×50 mL). The combined organic extracts were washed with 1 M hydrochloric acid (50 mL) and brine (50 mL), dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by column chromatography and eluted with a 20% to 100% gradient of ethyl acetate in hexanes followed by recrystallization from dichloromethane/diethyl ether to afford N-cyclobutyl-1′-methyl-2′-oxo-1′,2,2′,3-tetrahydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indole]-4′-carboxamide (0.045 g, 17%) as a colorless solid: mp 128-129° C. (dichloromethane/diethyl ether); 1H NMR (300 MHz, CDCl3) δ 7.41-7.33 (m, 1H), 7.26-7.21 (m, 1H), 6.97-6.93 (m, 1H), 6.51 (s, 1H), 6.20 (s, 1H), 5.46 (d, J=6.65 Hz, 1H), 4.96-4.81 (m, 2H), 4.35-4.01 (m, 5H), 3.25 (s, 3H), 2.27-2.09 (m, 2H), 1.70-1.40 (m, 4H); MS (ES+) m/z 407.0 (M+1). N,N,1′-trimethyl-2′-oxo-1′,2,2′,3-tetrahydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indole]-4′-carboxamide (0.12 g, 37%) was isolated as a byproduct from the synthesis of N-cyclobutyl-1′-methyl-2′-oxo-1′,2,2′,3-tetrahydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indole]-4′-carboxamide, obtained as colorless solid: mp 218-221° C. (dichloromethane/diethyl ether); 1H NMR (300 MHz, CDCl3) δ 7.32 (dd, J=7.8, 7.8 Hz, 1H), 6.91-6.84 (m, 2H), 6.44 (s, 1H), 6.22 (s, 1H), 5.05 (d, J=8.8 Hz, 1H), 4.79 (d, J=8.8 Hz, 1H), 4.20-4.04 (m, 4H), 3.28 (s, 3H), 2.79 (s, 3H), 2.19 (s, 3H); MS (ES+) m/z 381.0 (M+1).

Sources & evidence

ORD record: ord-dc4547f1b38949ba9c8733b6c8a1658a
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08916580B2

Reaction notes

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