Trifluoroacetic acid → HCID 58550931, compound

HRID 1908057Notes

Reaction equation

HRID 1908057 reaction equation
[CH3:1][C:2]1[CH:3]=[CH:4][C:5]([N:9]2[CH:13]=[CH:12][CH:11]=[CH:10]2)=[C:6]([OH:8])[CH:7]=1.O=[C:15]1[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]1.FC(F)(F)C(O)=O>ClCCl>[CH3:1][C:2]1[CH:3]=[CH:4][C:5]2[N:9]3[CH:13]=[CH:12][CH:11]=[C:10]3[C:15]3([CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]3)[O:8][C:6]=2[CH:7]=1

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 714438HCID 714438, compoundHCID 735900tert-Butyl 4-oxopiperidine-1-carboxylate

Product 1

HCID 58550931HCID 58550931, compoundYield 59.6%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To 5-methyl-2-pyrrol-1-yl-phenol (6.0 g, 33.6 mmol) in dichloromethane (75 mL) was added tert-butyl 4-oxopiperidine-1-carboxylate (6.61 g, 33.6 mmol) then trifluoroacetic acid (3.1 mL, 40.3 mmol) and the mixture was stirred at room temperature for 5.5 hours. The solvent was evaporated and the crude residue was purified by column chromatography utilizing a gradient of 0-100% dichloromethane in hexanes to yield tert-butyl 7′-methylspiro[piperidine-4,4′-pyrrolo[2,1-c][1,4]benzoxazine]-1-carboxylate (7.1 g, 59%). 1H NMR (400 MHz, CDCl3) δ 7.22 (d, J=8.1 Hz, 1H), 7.12-7.09 (m, 1H), 6.88 (s, 1H), 6.82 (d, J=8.0 Hz, 1H), 6.29 (t, J=3.2 Hz, 1H), 6.00-5.98 (m, 1H), 5.30 (s, 1H), 3.97 (s, 2H), 3.26 (t, J=12.2 Hz, 2H), 2.32 (s, 3H), 2.09-2.01 (m, 2H), 1.87 (dt, J=13.3, 4.9 Hz, 2H), 1.48 (s, 9H). ESI-MS m/z calc. 354.4. found 355.5 (M+1)+; Retention time 2.28 minutes (3 min run).

Workup

  1. customThe solvent was evaporated
  2. customthe crude residue was purified by column chromatography

Sources & evidence

ORD record
ord-be086e90ec064d959a2e23d9d32163d1
Source dataset
uspto-grants-2013_12
Patent number
US08598164B2

Reaction notes

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