Ethyl Acetate → 7-Benzyloxy-2-(2,4-dimethoxy-benzyl)-4-hydroxy-1,2-dihydro-isoquinoline-3-carboxylic acid ethyl ester

HRID 706259Notes

Reaction equation

C(OC(=O)C[N:6]([CH2:27][C:28]1[CH:33]=[CH:32][C:31]([O:34][CH3:35])=[CH:30][C:29]=1[O:36][CH3:37])[CH2:7][C:8]1[CH:13]=[C:12]([O:14][CH2:15][C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)[CH:11]=[CH:10][C:9]=1[C:22](OCC)=[O:23])C.CC(C)([O-])C.[K+].[C:45]([O:48][CH2:49][CH3:50])(=[O:47])[CH3:46].[Cl-].[NH4+]>C1COCC1>[CH2:49]([O:48][C:45]([C:46]1[N:6]([CH2:27][C:28]2[CH:33]=[CH:32][C:31]([O:34][CH3:35])=[CH:30][C:29]=2[O:36][CH3:37])[CH2:7][C:8]2[C:9]([C:22]=1[OH:23])=[CH:10][CH:11]=[C:12]([O:14][CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[CH:13]=2)=[O:47])[CH3:50]

Participants

Conditions

Temperature: 0 °C

Procedure

A solution of 6.4 g (12.3 mmol) of N-(2,4-dimethoxy-benzyl),N-(5-benzyloxy-2-ethoxycarbonyl-benzyl)glycine ethyl ester in 140 mL of anhydrous THF was cooled in an ice bath. 24.6 mL of 1 N potassium tert-butoxide in THF was added slowly to the stirring cold solution. The reaction mixture was stirred at 0° C. for 1 hour and then allowed to warm to room temperature and stirred for 4 hours. The mixture was poured into a biphasic mixture of ethyl acetate and saturated aqueous ammonium chloride. The organic fraction was washed twice with brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure to give 5.7 g of the title compound; MS (ESI+): 476.3 e/z (M+1)

Workup

temperatureto warm to room temperature
stirringstirred for 4 hours
washThe organic fraction was washed twice with brine
dry with materialdried over anhydrous sodium sulfate
concentrationconcentrated under reduced pressure

Sources & evidence

ORD record: ord-0042d2004b664b919bc7ddbda82ce2b2
Source dataset: uspto-grants-2015_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09174976B2

Reaction notes

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