Formamidine acetate → tert-Butyl 4-oxo-3,5,6,8-tetrahydropyrido[4',3':4,5]thieno[2,3-d]pyrimidine-7(4H)-carboxylate
Reaction equation
C([O:3][C:4]([C:6]1[C:14]2[CH2:13][CH2:12][N:11]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:10][C:9]=2[S:8][C:7]=1[NH2:22])=O)C.C(O)(=O)C.[CH:27](N)=[NH:28]>CN(C=O)C>[C:18]([O:17][C:15]([N:11]1[CH2:10][C:9]2[S:8][C:7]3[N:22]=[CH:27][NH:28][C:4](=[O:3])[C:6]=3[C:14]=2[CH2:13][CH2:12]1)=[O:16])([CH3:21])([CH3:20])[CH3:19]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 100 °C
Procedure
A mixture of 2-amino-4,7-dihydro-5H-thieno[2,3-c]pyridine-3,6-dicarboxylic acid 6-tert-butyl ester 3-ethyl ester (18.5 g) and formamidine acetate (8.85 g) in DMF (100 mL) were heated at 100° C. for 16 h. The reaction mixture was cooled and concentrated. The residues was partitioned between water and ethyl acetate. The organic layer was washed with water 3 times and concentrated to give the title compound (15.8 g, 90%). 1H NMR (400 MHz, CDCl3): δ 7.88 (s, 1H), 4.56-4.62 (brs, 2H), 3.62-3.70 (brs, 2H), 3.02-3.08 (brs, 2H), 1.42 (s, 9H). LC-MS (ESI) m/z 308.1 (M+H).
Workup
- temperatureThe reaction mixture was cooled
- concentrationconcentrated
- customThe residues was partitioned between water and ethyl acetate
- washThe organic layer was washed with water 3 times
- concentrationconcentrated
Sources & evidence
- ORD record
- ord-9e7d501f36714c719a3a53dfd0b1df44
- Source dataset
- uspto-grants-2013_08
- Patent number
- US08507502B2
Reaction notes
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