Trifluoroacetic acid → Trifluoroacetic acid

HRID 1951947Notes

Reaction equation

HRID 1951947 reaction equation
[CH:1]([C:4]1[C:5]([C:15]2[O:19][N:18]=[C:17]([C:20]3[CH:37]=[CH:36][C:23]([CH2:24][N:25]4[CH2:28][CH:27]([C:29]([O:31]C(C)(C)C)=[O:30])[CH2:26]4)=[CH:22][CH:21]=3)[N:16]=2)=[N:6][O:7][C:8]=1[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][N:10]=1)([CH3:3])[CH3:2].[F:38][C:39]([F:44])([F:43])[C:40]([OH:42])=[O:41]>ClCCl>[CH:1]([C:4]1[C:5]([C:15]2[O:19][N:18]=[C:17]([C:20]3[CH:37]=[CH:36][C:23]([CH2:24][N:25]4[CH2:28][CH:27]([C:29]([O-:31])=[O:30])[CH2:26]4)=[CH:22][CH:21]=3)[N:16]=2)=[N:6][O:7][C:8]=1[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][N:10]=1)([CH3:3])[CH3:2].[F:38][C:39]([F:44])([F:43])[C:40]([OH:42])=[O:41]

Participants

5

Reactant 2

HCID 6422Trifluoroacetic acidHCID 66678392Tert-butyl 1-(4-(5-(4-isopropyl-5-(pyridin-2-yl)isoxazol-3-yl)-1,2,4-oxadiazol-3-yl)benzyl)azetidine-3-carboxylate

Product 2

HCID 6422Trifluoroacetic acidYield 7.8%HCID 866614841-(4-(5-(4-Isopropyl-5-(pyridin-2-yl)isoxazol-3-yl)-1,2,4-oxadiazol-3-yl)benzyl)azetidine-3-carboxylate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of the tert-butyl 1-(4-(5-(4-isopropyl-5-(pyridin-2-yl)isoxazol-3-yl)-1,2,4-oxadiazol-3-yl)benzyl)azetidine-3-carboxylate in dichloromethane (0.5 mL) was added trifluoroacetic acid (0.5 mL), and the reaction mixture was stirred at room temperature for 30 minutes. The reaction mixture was concentrated and purified by preparative HPLC [Prep HPLC: Column: PHENOMENEX® S10 30×100 mm; Gradient time: 10 min; Flow rate=40 ml/min; Solvent A=10% MeOH—90% Water—0.1% TFA; Solvent B=90% MeOH—10% water—0.1% TFA; Start % B=20; Final % B=100.] to yield 1-(4-(5-(4-isopropyl-5-(pyridin-2-yl)isoxazol-3-yl)-1,2,4-oxadiazol-3-yl)benzyl)azetidine-3-carboxylate, trifluoroacetic acid salt (2.03 mg, 3.47 mmol, 7.8%). The compound had an HPLC retention time=7.58 min.—Column: Xbridge Ph 3.5 u 4.6×150 mm; Gradient time: 12 min, hold for 3 minutes; Flow rate=2 ml/min; Solvent A=5% MeCN—95% Water—0.05% TFA; Solvent B=95% MeCN—5% water—0.05% TFA; Start % B=10; Final % B=100. LC-MS: M+1=446.3. 1H NMR (500 MHz, MeOD) δ ppm 1.44 (s, 3H), 1.46 (s, 3H), 3.68-3.76 (m, 1H), 4.19 (quin, J=7.15 Hz, 1H), 4.37-4.42 (m, 4H), 4.54 (s, 2H), 7.53 (ddd, J=7.49, 4.74, 1.24 Hz, 1H), 7.70 (d, J=8.25 Hz, 2H), 7.96-8.00 (m, 1H), 8.00-8.05 (m, 1H), 8.30 (d, J=8.25 Hz, 2H), and 8.79 (d, J=4.67 Hz, 1H).

Workup

  1. concentrationThe reaction mixture was concentrated
  2. custompurified by preparative HPLC [Prep HPLC
  3. custom10 min

Sources & evidence

ORD record
ord-66e64eb84e7045a1a1e57183f70f243b
Source dataset
uspto-grants-2013_03
Patent number
US08404672B2

Reaction notes

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