2-Bromobenzoyl isothiocyanate → tert-Butyl 2-(3-(2-bromobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate

HRID 1616703Notes

Reaction equation

[NH2:1][C:2]1[S:12][C:5]2[CH2:6][O:7][C:8]([CH3:11])([CH3:10])[CH2:9][C:4]=2[C:3]=1[C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14].[Br:20][C:21]1[CH:31]=[CH:30][CH:29]=[CH:28][C:22]=1[C:23]([N:25]=[C:26]=[S:27])=[O:24]>C1COCC1>[Br:20][C:21]1[CH:31]=[CH:30][CH:29]=[CH:28][C:22]=1[C:23]([NH:25][C:26](=[S:27])[NH:1][C:2]1[S:12][C:5]2[CH2:6][O:7][C:8]([CH3:11])([CH3:10])[CH2:9][C:4]=2[C:3]=1[C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])=[O:24]

Participants

Conditions

Temperature: 50 °C

Procedure

tert-Butyl 2-amino-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate (0.28 g, 1.00 mmol) and 2-bromobenzoyl isothiocyanate (0.24 g, 1.00 mmol) were dissolved in THF (5 mL) and heated at 50° C. for 22 hours. The solvent was removed and EtOH (10 mL) was added. The product was filtered and rinsed with EtOH (2×10 mL). tert-Butyl 2-(3-(2-bromobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate (0.26 g, 0.49 mmol, 49% yield) was isolated as a white solid. 1H NMR (400 MHz, CDCl3) δ 14.64 (s, 1H), 9.04 (s, 1H), 7.75 (apparent dd, J=7.6, 1.8 Hz, 1H), 7.67 (apparent dd, J=7.9, 1.1 Hz, 1H), 7.45 (apparent td, J=7.5, 1.3 Hz, 1H), 7.40 (apparent td, J=7.7, 1.9 Hz, 1H), 4.74 (apparent t, J=1.5 Hz, 2H), 2.77 (t, J=1.5 Hz, 2H), 1.63 (s, 9H), 1.31 (s, 6H).

Workup

customThe solvent was removed
additionEtOH (10 mL) was added
filtrationThe product was filtered
washrinsed with EtOH (2×10 mL)

Sources & evidence

ORD record: ord-a25f826d321242e3b8efcf974cef99ef
Source dataset: uspto-grants-2014_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08765803B1

Reaction notes

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