Tert-butyl 4-(4-fluorophenyl)-4-(hydroxymethyl)piperidine-1-carboxylate → (+/-)-tert-Butyl 4-((1-(5-chloro-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-7-yl)ethoxy)methyl)-4-(4-fluorophenyl)piperidine-1-carboxylate

HRID 913887Notes

Reaction equation

HRID 913887 reaction equation
ClC(Cl)(Cl)C(=N)O[CH:5]([C:7]1[C:15]2[C:11](=[CH:12][N:13]([CH2:16][O:17][CH2:18][CH2:19][Si:20]([CH3:23])([CH3:22])[CH3:21])[N:14]=2)[CH:10]=[C:9]([Cl:24])[CH:8]=1)[CH3:6].[F:28][C:29]1[CH:34]=[CH:33][C:32]([C:35]2([CH2:48][OH:49])[CH2:40][CH2:39][N:38]([C:41]([O:43][C:44]([CH3:47])([CH3:46])[CH3:45])=[O:42])[CH2:37][CH2:36]2)=[CH:31][CH:30]=1>ClCCl.C1CCCCC1>[Cl:24][C:9]1[CH:8]=[C:7]([CH:5]([O:49][CH2:48][C:35]2([C:32]3[CH:31]=[CH:30][C:29]([F:28])=[CH:34][CH:33]=3)[CH2:36][CH2:37][N:38]([C:41]([O:43][C:44]([CH3:45])([CH3:46])[CH3:47])=[O:42])[CH2:39][CH2:40]2)[CH3:6])[C:15]2[C:11](=[CH:12][N:13]([CH2:16][O:17][CH2:18][CH2:19][Si:20]([CH3:22])([CH3:21])[CH3:23])[N:14]=2)[CH:10]=1

Participants

4

Reactant 2

HCID 19084679Tert-butyl 4-(4-fluorophenyl)-4-(hydroxymethyl)piperidine-1-carboxylateHCID 57546188(+/-)-1-(5-Chloro-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-7-yl)ethyl 2,2,2-trichloroacetimidate

Product 1

HCID 57546145(+/-)-tert-Butyl 4-((1-(5-chloro-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-7-yl)ethoxy)methyl)-4-(4-fluorophenyl)piperidine-1-carboxylate

Reagents, catalysts & solvents 1

HCID 21916607Dichloromethane cyclohexaneSolvent

Conditions

Temperature
0 °C

Procedure

(±)-1-(5-Chloro-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-7-yl)ethyl 2,2,2-trichloroacetimidate (1.1 g, 2.33 mmol) and tert-butyl 4-(4-fluorophenyl)-4-(hydroxymethyl)piperidine-1-carboxylate (0.79 g, 2.57 mmol) were combined in a dichloromethane/cyclohexane mixture (1:1, 10 mL) and cooled to 0° C. The reaction was treated with tetrafluoroboric acid-diethyl ether complex (64 μL, 0.47 mmol), stirred at 0° C. for 1 h, quenched by addition of saturated sodium bicarbonate, and diluted with diethyl ether. The layers were separated. The ethereal was washed with water (2×), brine (2×), dried over sodium sulfate, and concentrated. Column chromatography on silica gel (20% ethyl acetate/hexanes) gave 0.81 g (56%) as a clear film. 1H-NMR (CDCl3, 500 MHz) δ 8.00 (s, 1H), 7.49 (d, J=1.8 Hz, 1H), 7.30-7.33 (m, 2H), 7.01-7.05 (m, 2H), 6.77 (m, 1H), 5.62-5.68 (s, 2H), 4.93 (q, J=6.4 Hz, 1H), 3.72 (m, 2H), 3.58-3.61 (m, 2H), 3.33-3.39 (m, 2H), 3.03-3.08 (m, 2H), 2.08-2.22 (m, 2H), 1.87-1.97 (m, 2H), 1.44 (s, 9H), 1.43 (d, J=6.4 Hz, 3H), 0.91-0.92 (m, 2H), 0.05 (s, 9H). Mass spec.: 618.86 (MH)+.

Workup

  1. additionThe reaction was treated with tetrafluoroboric acid-diethyl ether complex (64 μL, 0.47 mmol)
  2. customquenched by addition of saturated sodium bicarbonate
  3. additiondiluted with diethyl ether
  4. customThe layers were separated
  5. washThe ethereal was washed with water (2×), brine (2×)
  6. dry with materialdried over sodium sulfate
  7. concentrationconcentrated
  8. customColumn chromatography on silica gel (20% ethyl acetate/hexanes) gave 0.81 g (56%) as a clear film

Sources & evidence

ORD record
ord-5360ac0f9fc54674812126238aca631f
Source dataset
uspto-grants-2011_09
Patent number
US08026257B2

Reaction notes

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