Thioglycolic Acid → 4-(4-Bromo-2-chloro-phenyl)-1-methyl-3-(2-pyridyl)-4,8-dihydropyrazolo[3,4-e][1,4]thiazepin-7-one

HRID 1748790Notes

Reaction equation

[CH3:1][N:2]1[C:6]([NH2:7])=[CH:5][C:4]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][N:9]=2)=[N:3]1.[Br:14][C:15]1[CH:22]=[CH:21][C:18]([CH:19]=O)=[C:17]([Cl:23])[CH:16]=1.[C:24](O)(=[O:27])[CH2:25][SH:26]>C(#N)C>[Br:14][C:15]1[CH:22]=[CH:21][C:18]([CH:19]2[S:26][CH2:25][C:24](=[O:27])[NH:7][C:6]3[N:2]([CH3:1])[N:3]=[C:4]([C:8]4[CH:13]=[CH:12][CH:11]=[CH:10][N:9]=4)[C:5]2=3)=[C:17]([Cl:23])[CH:16]=1

Participants

Conditions

Temperature: 150 °C

Procedure

A mixture of 1-methyl-3-(2-pyridyl)pyrazol-5-amine (1.6 g, 9.2 mmol), 4-bromo-2-chloro-benzaldehyde (2.0 g, 9.1 mmol, Apollo Scientific), and thioglycolic acid (3.4 g, 37 mmol) in acetonitrile (20 mL) was heated, in a sealed microwave vessel, for about 20 min, at about 150° C., in a microwave. After cooling to rt the precipitated solid was collected by filtration and washed with acetonitrile (4 mL) to afford 4-(4-bromo-2-chloro-phenyl)-1-methyl-3-(2-pyridyl)-4,8-dihydropyrazolo[3,4-e][1,4]thiazepin-7-one (2.86 g, 6.4 mmol, 70%), which was used as such. 1H-NMR (CDCl3, Bruker 400 MHz) δ 3.10 (1H, d, J=12 Hz); 3.43 (1H, d, J=12 Hz); 3.86 (3H, s); 6.68 (1H, s); 6.93 (1H, d, J=8 Hz); 7.15 (1H, m); 7.28 (1H, dd, J=2 Hz, 8 Hz); 7.65 (1H, d, J=2 Hz); 7.70 (1H, dd, J=2 Hz, 8 Hz), 7.78 (1H, d, J=8 Hz); 8.34 (1H, d, J=4 Hz); 10.2 (1H, s).

Workup

temperatureAfter cooling to rt the precipitated solid
filtrationwas collected by filtration
washwashed with acetonitrile (4 mL)

Sources & evidence

ORD record: ord-e52f2a0f93c2452a8dbfc289a43dbf70
Source dataset: uspto-grants-2015_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09150592B2

Reaction notes

Loading…