Pyridine → cis-4-[(3,5-Bis-trifluoromethyl-benzyl)-methoxycarbonyl-amino]-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic Acid Ethyl Ester

HRID 427718Notes

Reaction equation

HRID 427718 reaction equation
[CH2:1]([O:3][C:4]([N:6]1[C:15]2[C:10](=[CH:11][C:12]([C:16]([F:19])([F:18])[F:17])=[CH:13][CH:14]=2)[C@H:9]([NH:20][CH2:21][C:22]2[CH:27]=[C:26]([C:28]([F:31])([F:30])[F:29])[CH:25]=[C:24]([C:32]([F:35])([F:34])[F:33])[CH:23]=2)[CH2:8][C@@H:7]1[CH2:36][CH3:37])=[O:5])[CH3:2].N1C=CC=CC=1>ClCCl>[CH2:1]([O:3][C:4]([N:6]1[C:15]2[C:10](=[CH:11][C:12]([C:16]([F:17])([F:18])[F:19])=[CH:13][CH:14]=2)[C@H:9]([N:20]([CH2:21][C:22]2[CH:27]=[C:26]([C:28]([F:29])([F:30])[F:31])[CH:25]=[C:24]([C:32]([F:35])([F:33])[F:34])[CH:23]=2)[C:4]([O:3][CH3:1])=[O:5])[CH2:8][C@@H:7]1[CH2:36][CH3:37])=[O:5])[CH3:2]

Participants

4

Reactant 2

HCID 1049PyridineHCID 86584715cis-4-(3,5-bis-trifluoromethyl-benzylamino)-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester

Product 1

HCID 86584714cis-4-[(3,5-Bis-trifluoromethyl-benzyl)-methoxycarbonyl-amino]-2-ethyl-6-trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic Acid Ethyl EsterYield 162%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A solution of cis4-(3,5-bis-trifluoromethyl-benzylamino)-2-ethyl-6-trifluoromethy1-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester (2.0 g, 3.7 mmol) and pyridine (0.58 g, 7.4 mmol) in 100 mL of dichloromethane was cooled in an icewater bath as methyl chlorofomate (0.87 g, 9.2 mmol) was added slowly. After stirring overnight at room temperature, the reaction mixture was washed twice with a 2N hydrochloric acid solution, dried over magnesium sulfate, filtered and concentrated in vacuo to afford the crude product, which was purified by silica gel chromatography using 5-10% ethyl acetate/hexanes as eluent to afford 1.8 g of the title product. MS m/z 601 (M++1); 1H NMR (coalescing mixture of conformers, CDCl3) δ0.6-0.8 (bm, 3H), 1.2-1.3 (bm, 3H), 1.3-1.5 (bm, 2H), 1.6-1.75 (bm, 1H), 2.1-2.3 (bm, 1H), 3.7-3.9 (bs, 3H), 4.0-4.4 (bm, 4H), 5.0-5.6 (bm, 2H), 7.1 (s, 1H), 7.4-7.6 (bm, 2H), 7.6-7.8 (bm, 3H). [2R,4S]-4-[(3,5-bis-trifluoromethyl-benzyl)-methoxycarbonyl-amino]-2-ethyl -trifluoromethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid ethyl ester was prepared in optically enriched form by resolution of the corresponding racemate, or an intermediate in its synthesis, using standard methods.

Workup

  1. additionwas added slowly
  2. washthe reaction mixture was washed twice with a 2N hydrochloric acid solution
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. customto afford the crude product, which
  7. customwas purified by silica gel chromatography

Sources & evidence

ORD record
ord-74a6e1b3fd11405fad5f108670a51d4f
Source dataset
uspto-grants-2001_11
Patent number
US06313142B1

Reaction notes

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