Trifluoroacetic acid → 2-[(1-Methylethyl)oxy]-5-[3-(5-methyl-1,2,3,4-tetrahydro-6-isoquinolinyl)-1,2,4-oxadiazol-5-yl]benzonitrile trifluoroacetate

HRID 2059953Notes

Reaction equation

[F:1][C:2]([F:7])([F:6])[C:3]([OH:5])=[O:4].[C:8]([C:10]1[CH:11]=[C:12]([C:20]2[O:24][N:23]=[C:22]([C:25]3[C:26]([CH3:42])=[C:27]4[C:32](=[CH:33][CH:34]=3)[CH2:31][N:30](C(OC(C)(C)C)=O)[CH2:29][CH2:28]4)[N:21]=2)[CH:13]=[CH:14][C:15]=1[O:16][CH:17]([CH3:19])[CH3:18])#[N:9]>ClCCl>[F:1][C:2]([F:7])([F:6])[C:3]([OH:5])=[O:4].[CH3:19][CH:17]([O:16][C:15]1[CH:14]=[CH:13][C:12]([C:20]2[O:24][N:23]=[C:22]([C:25]3[C:26]([CH3:42])=[C:27]4[C:32](=[CH:33][CH:34]=3)[CH2:31][NH:30][CH2:29][CH2:28]4)[N:21]=2)=[CH:11][C:10]=1[C:8]#[N:9])[CH3:18]

Participants

Conditions

Temperature: 0 °C

Procedure

Trifluoroacetic acid (3 ml) was added to an ice cooled solution of 1,1-dimethylethyl 6-(5-{3-cyano-4-[(1-methylethyl)oxy]phenyl}-1,2,4-oxadiazol-3-yl)-5-methyl-3,4-dihydro-2(1H)-isoquinolinecarboxylate (Preparation 22; 486 mg, 1.02 mmol) in dichloromethane (3 ml). The reaction mixture was stirred at 0° C. for 30 minutes. The solvent was evaporated and the residue co-evaporated from toluene (×2). Trituration of the residue with diethyl ether gave the title compound as a colourless solid which was filtered off and dried (485 mg). 1H NMR (400 MHz, CDCl3) δ: 1.48 (6H, d), 2.54 (3H, s), 3.09 (2H, m), 3.5 (2H, obscured by residual solvent), 4.36 (2H, s), 4.80 (1H, m), 7.08-7.15 (2H, m), 7.85 (1H, d), 8.33 (1H, d), 8.42 (1H, s), 10.20 (2H, br s). MS m/z 375 [MH]+.

Workup

customThe solvent was evaporated

Sources & evidence

ORD record: ord-20f0faae31044263b80142e6bba1a910
Source dataset: uspto-grants-2012_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08278324B2

Reaction notes

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