Triethylamine → tert-Butyl ((4aS,5S,7aS)-7a-(5-bromo-2,4-difluorophenyl)-5-(fluoromethyl)-4a,5,7,7a-tetrahydro-4H-furo[3,4-d][1,3]thiazin-2-yl)carbamate

HRID 68379Notes

Reaction equation

[Br:1][C:2]1[C:3]([F:21])=[CH:4][C:5]([F:20])=[C:6]([C@:8]23[CH2:16][O:15][C@H:14]([CH2:17][F:18])[C@H:13]2[CH2:12][S:11][C:10]([NH2:19])=[N:9]3)[CH:7]=1.[O:22](C(OC(C)(C)C)=O)[C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=O.CCN(CC)CC>C1COCC1>[Br:1][C:2]1[C:3]([F:21])=[CH:4][C:5]([F:20])=[C:6]([C@:8]23[CH2:16][O:15][C@H:14]([CH2:17][F:18])[C@H:13]2[CH2:12][S:11][C:10]([NH:19][C:23](=[O:22])[O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[N:9]3)[CH:7]=1

Participants

Conditions

Temperature: 100 °C

Procedure

(4aS,5S,7aS)-7a-(5-Bromo-2,4-difluorophenyl)-5-(fluoromethyl)-4a,5,7,7a-tetrahydro-4H-furo[3,4-d][1,3]thiazin-2-amine (620 mg, 1.63 mmol) was dissolved in THF (10 mL). (BOC)2O (0.45 mL, 1.95 mmol) and Et3N (0.27 mL, 1.95 mmol) were added and the reaction was stirred at 100° C. After 1 hour, the solvents were removed in vacuo. The residue was purified using column chromatography (Biotage SNAP 25 g, 20 mL/min eluting with 20-80% EtOAc in n-hexane) to leave the title compound as a foam. (704 mg). 1H NMR (400 MHz, CDCl3) δ ppm: 7.54 (t, J=1.00 Hz, 1H), 6.86-7.01 (m, 1H), 4.49-4.71 (m, 3H), 4.45 (dd, J=1.22, 8.56 Hz, 1H), 3.68-3.92 (m, 1H), 2.95-3.20 (m, 2H), 2.73 (t, J=1.00 Hz, 1H), 1.46-1.64 (m, 9H)

Workup

customthe solvents were removed in vacuo
customThe residue was purified
washcolumn chromatography (Biotage SNAP 25 g, 20 mL/min eluting with 20-80% EtOAc in n-hexane)

Sources & evidence

ORD record: ord-3eba5390d71a4500af497243a052647f
Source dataset: uspto-grants-2014_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08822455B2

Reaction notes

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