1-Isopropylhydrazine hydrochloride → 8-bromo-2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene

HRID 886195Notes

Reaction equation

C[N:2](C)/[CH:3]=[N:4]\[C:5]([C:7]1[N:16]=[C:15]2[N:9]([CH2:10][CH2:11][O:12][C:13]3[CH:20]=[C:19]([Br:21])[CH:18]=[CH:17][C:14]=32)[CH:8]=1)=O.Cl.[CH:24]([NH:27]N)([CH3:26])[CH3:25]>C(O)(=O)C>[Br:21][C:19]1[CH:18]=[CH:17][C:14]2[C:15]3[N:9]([CH:8]=[C:7]([C:5]4[N:27]([CH:24]([CH3:26])[CH3:25])[N:2]=[CH:3][N:4]=4)[N:16]=3)[CH2:10][CH2:11][O:12][C:13]=2[CH:20]=1

Participants

Conditions

Temperature: 100 °C

Procedure

Alternatively, to a suspension of 8-bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carboxylic acid 1-dimethylamino-meth-(Z)-ylideneamide (8.52 g, 23.5 mmol) in acetic acid (50 mL) was added isopropylhydrazine hydrochloride (3.37 g, 30.5 mmol) and the reaction mixture heated at 100° C. for 1 h. The reaction mixture was allowed to cool to RT and was poured onto water (500 mL) causing the product to precipitate as an off-white solid. The product was collected by filtration, washed with water (˜200 mL) and dried in vacuo at 45° C. for 16 h to yield 194 as an off-white solid (7.88 g, 86%). 1H NMR (400 MHz, d6-DMSO) 8.43 (1H, d, J=8.6 Hz), 7.97 (1H, s), 7.92 (1H, d, J=0.6 Hz), 7.36 (1H, dd, J=8.6, 2.0 Hz), 7.30 (1H, d, J=2.0 Hz), 5.86 (1H, sept, J=6.6 Hz), 4.56-4.52 (4H, m), 1.48 (6H, d, J=6.6 Hz). LCMS: RT=4.69 min, M+H+=374/376. 1H NMR showed product to contain ˜5% 8-iodo-2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene.

Workup

temperatureto cool to RT
additionwas poured onto water (500 mL)
customto precipitate as an off-white solid
filtrationThe product was collected by filtration
washwashed with water (˜200 mL)
customdried in vacuo at 45° C. for 16 h

Sources & evidence

ORD record: ord-43c5140eea7b441da36c562915bd00ee
Source dataset: uspto-grants-2012_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08242104B2

Reaction notes

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