1,2-Dimethoxyethane → (2S)-ethyl 2-tert-butoxy-2-(2,7-dimethyl-5-(3,5,6,7-tetrahydro-2H-[1,4]oxazino[2,3,4-ij]quinolin-8-yl)quinolin-6-yl)acetate

HRID 931831Notes

Reaction equation

HRID 931831 reaction equation
Br[C:2]1[C:11]([C@H:12]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])[C:13]([O:15][CH2:16][CH3:17])=[O:14])=[C:10]([CH3:23])[CH:9]=[C:8]2[C:3]=1[CH:4]=[CH:5][C:6]([CH3:24])=[N:7]2.CC1(C)C(C)(C)OB([C:33]2[CH:42]=[CH:41][C:40]3[O:43][CH2:44][CH2:45][N:38]4[C:39]=3[C:34]=2[CH2:35][CH2:36][CH2:37]4)O1.C(COC)OC.C([O-])([O-])=O.[K+].[K+]>C(OCC)(=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:19]([O:18][C@@H:12]([C:11]1[C:2]([C:33]2[CH:42]=[CH:41][C:40]3[O:43][CH2:44][CH2:45][N:38]4[C:39]=3[C:34]=2[CH2:35][CH2:36][CH2:37]4)=[C:3]2[C:8](=[CH:9][C:10]=1[CH3:23])[N:7]=[C:6]([CH3:24])[CH:5]=[CH:4]2)[C:13]([O:15][CH2:16][CH3:17])=[O:14])([CH3:22])([CH3:21])[CH3:20]

Participants

7

Reactant 4

HCID 80711,2-DimethoxyethaneHCID 11430Potassium CarbonateHCID 595785348-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,5,6,7-tetrahydro-2H-[1,4]oxazino[2,3,4-ij]quinolineHCID 68586165(S)-ethyl 2-(5-bromo-2,7-dimethylquinolin-6-yl)-2-tert-butoxyacetate

Product 1

HCID 68594976(2S)-ethyl 2-tert-butoxy-2-(2,7-dimethyl-5-(3,5,6,7-tetrahydro-2H-[1,4]oxazino[2,3,4-ij]quinolin-8-yl)quinolin-6-yl)acetate

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
80 °C

Procedure

Preparation of (2S)-ethyl 2-tert-butoxy-2-(2,7-dimethyl-5-(3,5,6,7-tetrahydro-2H-[1,4]oxazino[2,3,4-ij]quinolin-8-yl)quinolin-6-ypacetate: A Smith process vial was charged with (S)-ethyl 2-(5-bromo-2,7-dimethylquinolin-6-yl)-2-tert-butoxyacetate (52 mg, 0.133 mmol, 1 eq.), 8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,5,6,7-tetrahydro-2H-[1,4]oxazino[2,3,4-ij]quinoline (48 mg, 0.159 mmol.), Pd(PPh3)4 (15 mg, 10%) and flushed with nitrogen. Dimethoxyethane (1.6 mL) and 2 M K2CO3 (0.24 mL, 0.48 mmol) was added. The reaction was heated in oil bath at 80° C. for 5 hours. The reaction mixture was diluted with ethyl acetate and washed with brine, dried (MgSO4), filtered, concentrated and purified by flash column chromatography (silica gel, 0 to 20% ethyl acetate/hexanes) to give (2S)-ethyl 2-tert-butoxy-2-(2,7-dimethyl-5-(3,5,6,7-tetrahydro-2H-[1,4]oxazino[2,3,4-ij]quinolin-8-yl)quinolin-6-yl)acetate as atropisomer mixture (39 mg, 60%). LCMS-ESI+: calcd for C30H37N2O4: 489.52 (M+H+). Found: 489.3.

Workup

  1. customflushed with nitrogen
  2. washwashed with brine
  3. dry with materialdried (MgSO4)
  4. filtrationfiltered
  5. concentrationconcentrated
  6. custompurified by flash column chromatography (silica gel, 0 to 20% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-b865f728e6104b0d8ee2d6687083c8a4
Source dataset
uspto-grants-2016_03
Patent number
US09296758B2

Reaction notes

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