Diisopropylethylamine → (2S,5S)-1-tert-butyl 2-(3-chloro-8-oxo-8,9,10,11-tetrahydro-5H-dibenzo[c,g]chromen-9-yl) 5-methylpyrrolidine-1,2-dicarboxylate

HRID 1509754Notes

Reaction equation

HRID 1509754 reaction equation
Br[CH:2]1[CH2:20][CH2:19][C:5]2=[CH:6][C:7]3[C:8]4[CH:17]=[CH:16][C:15]([Cl:18])=[CH:14][C:9]=4[CH2:10][O:11][C:12]=3[CH:13]=[C:4]2[C:3]1=[O:21].[C:22]([O:26][C:27]([N:29]1[C@@H:33]([CH3:34])[CH2:32][CH2:31][C@H:30]1[C:35]([OH:37])=[O:36])=[O:28])([CH3:25])([CH3:24])[CH3:23].CCN(C(C)C)C(C)C>CC#N.CCOC(C)=O>[CH3:34][C@@H:33]1[N:29]([C:27]([O:26][C:22]([CH3:23])([CH3:25])[CH3:24])=[O:28])[C@H:30]([C:35]([O:37][CH:2]2[CH2:20][CH2:19][C:5]3=[CH:6][C:7]4[C:8]5[CH:17]=[CH:16][C:15]([Cl:18])=[CH:14][C:9]=5[CH2:10][O:11][C:12]=4[CH:13]=[C:4]3[C:3]2=[O:21])=[O:36])[CH2:31][CH2:32]1

Participants

6

Reactant 3

HCID 81531DiisopropylethylamineHCID 15516206(5S)-1-(tert-Butoxycarbonyl)-5-methyl-L-prolineHCID 696732929-bromo-3-chloro-10,11-dihydro-5H-dibenzo[c,g]chromen-8(9H)-one

Product 1

HCID 69675575(2S,5S)-1-tert-butyl 2-(3-chloro-8-oxo-8,9,10,11-tetrahydro-5H-dibenzo[c,g]chromen-9-yl) 5-methylpyrrolidine-1,2-dicarboxylateYield 82.1%

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
50 °C

Procedure

To a solution of 9-bromo-3-chloro-10,11-dihydro-5H-dibenzo[c,g]chromen-8(9H)-one (1.41 g, 3.88 mmol) in MeCN (17 mL) was added (2S,5S)-1-(tert-butoxycarbonyl)-5-methylpyrrolidine-2-carboxylic acid (980 mg, 4.27 mmol) and DIPEA (1.49 mL, 8.54 mmol). After stirring for 18 h at 50° C., the solution was diluted with EtOAc and washed successively with 1N HCl, saturated aqueous NaHCO3 and brine. The organics were dried over Na2SO4, filtered and concentrated under reduced pressure. The crude residue was purified by silica column chromatography (10% to 30% EtOAc/hexanes) to afford (2S,5S)-1-tert-butyl 2-(3-chloro-8-oxo-8,9,10,11-tetrahydro-5H-dibenzo[c,g]chromen-9-yl) 5-methylpyrrolidine-1,2-dicarboxylate (1.63 g, 81%).

Workup

  1. washwashed successively with 1N HCl, saturated aqueous NaHCO3 and brine
  2. dry with materialThe organics were dried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated under reduced pressure
  5. customThe crude residue was purified by silica column chromatography (10% to 30% EtOAc/hexanes)

Sources & evidence

ORD record
ord-6e00e6a1eab84563aae72cae9eeada84
Source dataset
uspto-grants-2015_12
Patent number
US09221833B2

Reaction notes

Loading…