Diisopropylethylamine → tert-Butyl [1-(3-nitro-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl)-5-(trifluoromethyl)piperidin-3-yl]carbamate

HRID 1499619Notes

Reaction equation

HRID 1499619 reaction equation
Cl[C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[CH:6][N:5]=[C:4]2[CH2:11][CH2:12][CH2:13][C:3]=12.[F:14][C:15]([F:31])([F:30])[C@H:16]1[CH2:21][NH:20][CH2:19][C@@H:18]([NH:22][C:23](=[O:29])[O:24][C:25]([CH3:28])([CH3:27])[CH3:26])[CH2:17]1.CCN(C(C)C)C(C)C>C(O)(C)C>[N+:8]([C:7]1[C:2]([N:20]2[CH2:21][CH:16]([C:15]([F:31])([F:30])[F:14])[CH2:17][CH:18]([NH:22][C:23](=[O:29])[O:24][C:25]([CH3:27])([CH3:26])[CH3:28])[CH2:19]2)=[C:3]2[CH2:13][CH2:12][CH2:11][C:4]2=[N:5][CH:6]=1)([O-:10])=[O:9]

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 73977851tert-butyl N-[(3S,5R)-5-(trifluoromethyl)piperidin-3-yl]carbamateHCID 867266864-Chloro-3-nitro-6,7-dihydro-5H-cyclopenta[b]pyridine

Product 1

HCID 86726837tert-Butyl [1-(3-nitro-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl)-5-(trifluoromethyl)piperidin-3-yl]carbamateYield 50.6%

Reagents, catalysts & solvents 1

HCID 3776IsopropanolSolvent

Conditions

Temperature
110 °C

Procedure

A mixture of 4-chloro-3-nitro-6,7-dihydro-5H-cyclopenta[b]pyridine (0.34 g, 1.7 mmol), cis-tert-butyl [5-(trifluoromethyl)piperidin-3-yl]carbamate (0.50 g, 1.9 mmol) in isopropyl alcohol (1.0 g) and DIPEA (1.0 mL, 5.7 mmol) was stirred at 110° C. for 2 h. The solution was allowed to cool to room temperature, then the mixture was concentrated under reduced pressure. The residue was purified by purified by column chromatography on silica gel using CombiFlash® apparatus (40 g column, eluting with 0 to 70% EtOAc in hexanes) to give the sub-title compound as a pale yellow powder (0.37 g, 50%). LCMS calc. for C19H26F3N4O4 (M+H)+ m/z=431.2. found: 431.0. The material was subjected to chiral HPLC (Phenomenex Lux® Cellulose 4 column, 21, 2×250 mm, 5 micron particle size; Mobile phase: 7% EtOH in hexanes; Flow rate: 18 mL/min. isocratic; Column loading: 10 mg/injection; Run time: 24 minutes) to give two separated enantiomers of the sub-title compound.

Workup

  1. temperatureto cool to room temperature
  2. concentrationthe mixture was concentrated under reduced pressure
  3. customThe residue was purified
  4. customby purified by column chromatography on silica gel using CombiFlash® apparatus (40 g column, eluting with 0 to 70% EtOAc in hexanes)

Sources & evidence

ORD record
ord-dc6027473065473692bf10570d67633d
Source dataset
uspto-grants-2015_12
Patent number
US09200004B2

Reaction notes

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