Diisopropylethylamine → 4-(3,3''-dimethyl-3',4',5',6'-tetrahydro-2'H-[2,2'; 6',2'']terpyridin-1'-ylmethyl)-3-nitro-benzoic acid methyl ester

HRID 1784200Notes

Reaction equation

HRID 1784200 reaction equation
[CH3:1][C:2]1[C:3]([CH:8]2[CH2:13][CH2:12][CH2:11][CH:10]([C:14]3[C:19]([CH3:20])=[CH:18][CH:17]=[CH:16][N:15]=3)[NH:9]2)=[N:4][CH:5]=[CH:6][CH:7]=1.[CH3:21][O:22][C:23](=[O:35])[C:24]1[CH:29]=[CH:28][C:27]([CH2:30]Br)=[C:26]([N+:32]([O-:34])=[O:33])[CH:25]=1.CCN(C(C)C)C(C)C>CN(C=O)C>[CH3:21][O:22][C:23](=[O:35])[C:24]1[CH:29]=[CH:28][C:27]([CH2:30][N:9]2[CH:8]([C:3]3[C:2]([CH3:1])=[CH:7][CH:6]=[CH:5][N:4]=3)[CH2:13][CH2:12][CH2:11][CH:10]2[C:14]2[C:19]([CH3:20])=[CH:18][CH:17]=[CH:16][N:15]=2)=[C:26]([N+:32]([O-:34])=[O:33])[CH:25]=1

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 13399987Methyl 4-(bromomethyl)-3-nitrobenzoateHCID 674211653,3''-Dimethyl-1',2',3',4',5',6'-hexahydro-[2,2'; 6',2'']terpyridine

Product 1

HCID 674219694-(3,3''-dimethyl-3',4',5',6'-tetrahydro-2'H-[2,2'; 6',2'']terpyridin-1'-ylmethyl)-3-nitro-benzoic acid methyl esterYield 98.1%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Using General Procedure A: A solution of 3,3″-dimethyl-1′,2′,3′,4′,5′,6′-hexahydro-[2,2′;6′,2″]terpyridine (0.829 g, 3.10 mmol), 4-bromomethyl-3-nitrobenzoic acid methyl ester (1.26 g, 4.61 mmol), KI (115 mg, 0.69 mmol), and DIPEA (1.20 mL, 6.89 mmol) in DMF (16 mL) was heated at 60° C. for 18 hours. Purification of the crude material by column chromatography on silica gel (40:1:1 CH2Cl2—CH3OH—NH4OH) provided 1.40 g (98%) of 4-(3,3″-dimethyl-3′,4′,5′,6′-tetrahydro-2′H-[2,2′;6′,2″]terpyridin-1′-ylmethyl)-3-nitro-benzoic acid methyl ester as a tan solid. To a solution of 4-(3,3″-dimethyl-3′,4′,5′,6′-tetrahydro-2′H-[2,2′;6′,2″]terpyridin-1′-ylmethyl)-3-nitro-benzoic acid methyl ester (1.40 g, 3.03 mmol) in MeOH (15 mL) and EtOAc (15 mL) was added palladium (50% wet with water), 10 wt. % on activated carbon (0.30 g). The resultant mixture was hydrogenated at 30 psi on a Parr shaker for 3 hours. The mixture was vacuum filtered through celite and the cake was washed with MeOH and EtOAc. The solvent was removed from the filtrate under reduced pressure and the thus obtained oil was purified by column chromatography on silica gel (40:1:1 CH2Cl2—CH3OH—NH4OH) and provided 0.90 g (69%) of 3-amino-4-(3,3″-dimethyl-3′,4′,5′,6′-tetrahydro-2′H-[2,2′;6′,2″]terpyridin-1′-ylmethyl)-benzoic acid methyl ester.

Workup

  1. customPurification of the crude material by column chromatography on silica gel (40:1:1 CH2Cl2—CH3OH—NH4OH)

Sources & evidence

ORD record
ord-9689d5366eb44f93b0738e4b5c2d797b
Source dataset
uspto-grants-2009_03
Patent number
US07501518B2

Reaction notes

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