4-chloropyridine N-oxide → (3R)-3-[(2-Chloro-benzoyl)amino]-N-methyl-N-[1-(1-oxido-pyridin-1-ium-4-yl)-piperidin-4-yl]-2,3-dihydro-1H-indene-5-carboxylic acid amide

HRID 1193421Notes

Reaction equation

[Cl:1][C:2]1[CH:29]=[CH:28][CH:27]=[CH:26][C:3]=1[C:4]([NH:6][C@H:7]1[C:15]2[C:10](=[CH:11][CH:12]=[C:13]([C:16]([N:18]([CH3:25])[CH:19]3[CH2:24][CH2:23][NH:22][CH2:21][CH2:20]3)=[O:17])[CH:14]=2)[CH2:9][CH2:8]1)=[O:5].Cl[C:31]1[CH:36]=[CH:35][N+:34]([O-:37])=[CH:33][CH:32]=1.CCN(C(C)C)C(C)C>C(O)C>[Cl:1][C:2]1[CH:29]=[CH:28][CH:27]=[CH:26][C:3]=1[C:4]([NH:6][C@H:7]1[C:15]2[C:10](=[CH:11][CH:12]=[C:13]([C:16]([N:18]([CH3:25])[CH:19]3[CH2:20][CH2:21][N:22]([C:31]4[CH:36]=[CH:35][N+:34]([O-:37])=[CH:33][CH:32]=4)[CH2:23][CH2:24]3)=[O:17])[CH:14]=2)[CH2:9][CH2:8]1)=[O:5]

Participants

Conditions

Temperature: 130 °C

Procedure

A mixture of (R)-3-(2-chlorobenzamido)-N-methyl-N-(piperidin-4-yl)-2,3-dihydro-1H-indene-5-carboxamide (see stage 2 illustrative compound H-214) (200 mg, 0.486 mmol, 1 eq), 4-chloropyridine N-oxide (63 mg, 0.486 mmol, 1 eq) and DIPEA (0.210 ml, 1.215 mmol, 2.5 eq) in ethanol (10 ml) was heated for 72 h at 130° C. in a pressure vessel. The reaction mixture was concentrated under reduced pressure and the crude product was then prepurified by column chromatography (Alox, 1% methanol/dichloromethane). It was then further purified by means of preparative TLC. The desired product was in the form of a white solid. Yield: 18% (90 mg, 0.178 mmol) The indicated yield is based on 2 combined batches of size 200 mg

Workup

concentrationThe reaction mixture was concentrated under reduced pressure
customIt was then further purified by means of preparative TLC
customYield: 18% (90 mg, 0.178 mmol) The indicated yield

Sources & evidence

ORD record: ord-13a0cbb562144cefaae4b06fde210c40
Source dataset: uspto-grants-2014_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08680159B2

Reaction notes

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