Dimethylformamide dimethyl acetal → methyl 2-(1-isopropyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine-9-carboxylate

HRID 1800010Notes

Reaction equation

HRID 1800010 reaction equation
[C:1]([C:4]1[N:5]=[C:6]2[C:12]3[CH:13]=[CH:14][C:15]([C:17]([O:19][CH3:20])=[O:18])=[CH:16][C:11]=3[O:10][CH2:9][CH2:8][N:7]2[CH:21]=1)(=O)[NH2:2].COC(OC)[N:25]([CH3:27])C>C(COC)OC>[CH:4]([N:5]1[C:1]([C:4]2[N:5]=[C:6]3[C:12]4[CH:13]=[CH:14][C:15]([C:17]([O:19][CH3:20])=[O:18])=[CH:16][C:11]=4[O:10][CH2:9][CH2:8][N:7]3[CH:21]=2)=[N:2][CH:27]=[N:25]1)([CH3:21])[CH3:1]

Participants

4

Reactant 2

HCID 78373Dimethylformamide dimethyl acetalHCID 67050624HCID 67050624, compound

Product 1

HCID 58204510methyl 2-(1-isopropyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine-9-carboxylate

Reagents, catalysts & solvents 1

HCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
90 °C

Procedure

Alternatively, methyl 2-carbamoyl-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepine-9-carboxylate (370 mg, 1.3 mmol) in dimethoxyethane (3 mL) was treated with 1,1-dimethoxy-N,N-dimethylmethanamine (1 mL, 7.5 mmol) and heated to 90° C. for 0.5 h. LC/MS indicated major desired product. After cooling, the reaction was concentrated to give the crude acylamidine and then suspended in acetic acid (2.3 mL), treated with isopropylhydrazine hydrochloride (0.29 g, 2.5 mmol). The mixture was heated at 75° C. for 30 min., cooled to room temperature and concentrated. Purification by ISCO using 100% EtOAc gave 184 (0.32 g, 70% yield). 1H NMR (400 MHz, DMSO) δ 8.54 (d, J=8.4, 1H), 8.02 (s, 1H), 7.93 (s, 1H), 7.70 (dd, J=8.4, 1.7, 1H), 7.57 (d, J=1.7, 1H), 5.85 (dq, J=13.3, 6.6, 1H), 4.57 (q, J=6.0, 4H), 3.87 (s, 3H), 1.49 (d, J=6.6, 6H).

Sources & evidence

ORD record
ord-db79976c9f404de7a22074090c7fa394
Source dataset
uspto-grants-2013_01
Patent number
US08343955B2

Reaction notes

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