Trifluoroacetic acid methylene chloride → (R)-(1-(4-fluorophenyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(thiazol-2-yl)methanone trifluoroacetate

HRID 537248Notes

Reaction equation

HRID 537248 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:12]3[CH:13]=[C:14]4[C@:19]([C:21]([C:23]5[S:24][CH:25]=[CH:26][N:27]=5)=[O:22])([CH2:20][C:11]=3[CH:10]=[N:9]2)[CH2:18][N:17](C(OC(C)(C)C)=O)[CH2:16][CH2:15]4)=[CH:4][CH:3]=1.[F:35][C:36]([F:41])([F:40])[C:37]([OH:39])=[O:38].ClCCl>>[F:35][C:36]([F:41])([F:40])[C:37]([OH:39])=[O:38].[F:1][C:2]1[CH:3]=[CH:4][C:5]([N:8]2[C:12]3[CH:13]=[C:14]4[C@:19]([C:21]([C:23]5[S:24][CH:25]=[CH:26][N:27]=5)=[O:22])([CH2:20][C:11]=3[CH:10]=[N:9]2)[CH2:18][NH:17][CH2:16][CH2:15]4)=[CH:6][CH:7]=1

Participants

3

Reactant 2

HCID 21863450Trifluoroacetic acid methylene chlorideHCID 86709981(R)-tert-butyl 1-(4-fluorophenyl)-4a-(thiazole-2-carbonyl)-4a,5,7,8-tetrahydro-1H-pyrazolo[3,4-g]isoquinoline-6(4H)-carboxylate

Product 1

HCID 86709982(R)-(1-(4-fluorophenyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(thiazol-2-yl)methanone trifluoroacetate

Procedure

A solution of (R)-tert-butyl 1-(4-fluorophenyl)-4a-(thiazole-2-carbonyl)-4a,5,7,8-tetrahydro-1H-pyrazolo[3,4-g]isoquinoline-6(4H)-carboxylate (1.0 g, 1.561 mmol) in 20% trifluoroacetic acid/dichloromethane (100 mL) was stirred at room temperature for 30 minutes. The solvent was removed in vacuo then the crude residue azeotroped twice with toluene to give (R)-(1-(4-fluorophenyl)-4,4a,5,6,7,8-hexahydro-1H-pyrazolo[3,4-g]isoquinolin-4a-yl)(thiazol-2-yl)methanone trifluoroacetate as an orange solid (0.584 g). LCMS (Method F, ES-API): RT 1.30 min, m+H=381.0; 1H NMR (400 MHz, CDCl3): δ 8.02 (1H, d, J=2.7 Hz), 7.78 (1H, d, J=2.7 Hz), 7.48 (1H, s), 7.46-7.41 (2H, m), 7.24-7.16 (2H, m), 6.57 (1H, s), 4.45 (1H, d, J=12.5 Hz), 3.86 (1H, d, J=16.2 Hz), 3.74-3.65 (2H, m), 3.34 (1H, d, J=13.2 Hz), 3.12 (1H, br t, J=10.6 Hz), 2.89 (1H, d, J=16.2 Hz), 2.82 (1H, d, J=13.1 Hz), 2.62 (1H, d, J=15.4 Hz).

Workup

  1. customThe solvent was removed in vacuo
  2. customthe crude residue azeotroped twice with toluene

Sources & evidence

ORD record
ord-2f336c5d30874328b3d93eadafe09108
Source dataset
uspto-grants-2014_10
Patent number
US08859774B2

Reaction notes

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