tert-Butyl 2-(3-(4-fluorobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate → 2-(3-(4-fluorobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylic acid

HRID 1616707Notes

Reaction equation

HRID 1616707 reaction equation
[F:1][C:2]1[CH:31]=[CH:30][C:5]([C:6]([NH:8][C:9](=[S:29])[NH:10][C:11]2[S:21][C:14]3[CH2:15][O:16][C:17]([CH3:20])([CH3:19])[CH2:18][C:13]=3[C:12]=2[C:22]([O:24]C(C)(C)C)=[O:23])=[O:7])=[CH:4][CH:3]=1>C(O)(C(F)(F)F)=O.C(Cl)Cl>[F:1][C:2]1[CH:3]=[CH:4][C:5]([C:6]([NH:8][C:9](=[S:29])[NH:10][C:11]2[S:21][C:14]3[CH2:15][O:16][C:17]([CH3:20])([CH3:19])[CH2:18][C:13]=3[C:12]=2[C:22]([OH:24])=[O:23])=[O:7])=[CH:30][CH:31]=1

Participants

3

Reactant 1

HCID 86731955tert-Butyl 2-(3-(4-fluorobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate

Product 1

HCID 533774052-(3-(4-fluorobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylic acidYield 72%

Reagents, catalysts & solvents 1

HCID 21863450Trifluoroacetic acid methylene chlorideSolvent

Procedure

A solution of 40% v/v TFA/DCM (20 mL) was added to tert-butyl 2-(3-(4-fluorobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate (0.33 g, 0.71 mmol) and the mixture was stirred at RT for 1 hour. The volatiles were removed at 30° C. and the material was purified by reverse-phase chromatography (10-100% MeCN/water). 2-(3-(4-Fluorobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylic acid (0.21 g, 0.51 mmol, 72% yield) was isolated as a pale, yellow solid. 1H NMR (400 MHz, DMSO) δ 14.81 (s, 1H), 13.36 (s, 1H), 11.83 (s, 1H), 8.11-8.00 (m, 2H), 7.38 (apparent t, J=8.9 Hz, 2H), 4.66 (s, 2H), 2.74 (s, 2H), 1.23 (s, 6H). 13C NMR (101 MHz, DMSO) δ 174.33, 166.13, 165.72, 165.35, 163.63, 146.76, 131.80, 131.70, 129.08, 128.60, 128.57, 124.06, 116.48, 115.54, 115.32, 70.12, 58.80, 37.25, 26.16. LCMS retention time: 3.206 min; LCMS purity at 214 nm=98%. HRMS m/z calculated for C18H18FN2O4S2 [M++1]: 409.0687. found 409.0687. Melting point 205.3° C., decomposition.

Workup

  1. customThe volatiles were removed at 30° C.
  2. customthe material was purified by reverse-phase chromatography (10-100% MeCN/water)

Sources & evidence

ORD record
ord-1fd1e2e329ee4541a4aa654add0ca0e5
Source dataset
uspto-grants-2014_07
Patent number
US08765803B1

Reaction notes

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