Triphenylphosphine → Tert-butyl 4-(6-(1-(4-(trifluoromethyl)phenyl)piperidin-4-yloxy)benzo[d]oxazole-2-carboxamido)piperidine-1-carboxylate

HRID 1773449Notes

Reaction equation

HRID 1773449 reaction equation
[OH:1][C:2]1[CH:26]=[CH:25][C:5]2[N:6]=[C:7]([C:9]([NH:11][CH:12]3[CH2:17][CH2:16][N:15]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[CH2:14][CH2:13]3)=[O:10])[O:8][C:4]=2[CH:3]=1.N(C(OC(C)C)=O)=NC(OC(C)C)=O.[F:41][C:42]([F:57])([F:56])[C:43]1[CH:48]=[CH:47][C:46]([N:49]2[CH2:54][CH2:53][CH:52](O)[CH2:51][CH2:50]2)=[CH:45][CH:44]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>C1(C)C=CC=CC=1>[F:57][C:42]([F:41])([F:56])[C:43]1[CH:44]=[CH:45][C:46]([N:49]2[CH2:54][CH2:53][CH:52]([O:1][C:2]3[CH:26]=[CH:25][C:5]4[N:6]=[C:7]([C:9]([NH:11][CH:12]5[CH2:13][CH2:14][N:15]([C:18]([O:20][C:21]([CH3:22])([CH3:23])[CH3:24])=[O:19])[CH2:16][CH2:17]5)=[O:10])[O:8][C:4]=4[CH:3]=3)[CH2:51][CH2:50]2)=[CH:47][CH:48]=1

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 75555Diisopropyl diazene-1,2-dicarboxylateHCID 220976741-[4-(Trifluoromethyl)phenyl]piperidin-4-olHCID 57951081Tert-butyl 4-(6-hydroxybenzo[d]oxazole-2-carboxamido)piperidine-1-carboxylate

Product 1

HCID 57951056Tert-butyl 4-(6-(1-(4-(trifluoromethyl)phenyl)piperidin-4-yloxy)benzo[d]oxazole-2-carboxamido)piperidine-1-carboxylateYield 66.3%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

To a stirred solution of tert-butyl 4-(6-hydroxybenzo[d]oxazole-2-carboxamido)piperidine-1-carboxylate (0.15 g, 0.41 mmol) in toluene (4 mL) at room temperature was added diisopropyl azodicarboxylate (0.1 g, 0.49 mmol), 1-(4-(trifluoromethyl)phenyl) piperidin-4-ol (0.1 g, 0.41 mmol), and triphenylphosphine (0.13 g, 0.49 mmol). The mixture was stirred at room temperature overnight and then concentrated under reduced pressure. The residue obtained was purified by flash chromatography (silica gel, ethyl acetate/hexanes=2/3) to afford tert-butyl 4-(6-(1-(4-(trifluoromethyl)phenyl)piperidin-4-yloxy)benzo[d]oxazole-2-carboxamido)piperidine-1-carboxylate (compound 1) as a off-white solid (0.16 g, 66%). 1H-NMR (CDCl3, 300 MHz): δ 7.65 (m, 1H), 7.48 (m, 2H), 7.15 (m, 1H), 7.05 (m, 2H), 6.96 (m, 2H), 4.56 (m, 1H), 4.12 (m, 3H), 3.60 (m, 2H), 3.28 (m, 2H), 2.93 (m, 2H), 2.04 (m, 8H), 1.47 (s, 9H) ppm; MS (ESI): 589.6 (M+1).

Workup

  1. concentrationconcentrated under reduced pressure
  2. customThe residue obtained
  3. customwas purified by flash chromatography (silica gel, ethyl acetate/hexanes=2/3)

Sources & evidence

ORD record
ord-0c5b4b6b1f404a4996cdba02bd7e8e23
Source dataset
uspto-grants-2016_02
Patent number
US09255085B2

Reaction notes

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