Ethanolamine → 8-{2-[2-(2-chloro-4-fluorophenyl)-1,1-dimethylethylamino]-1-hydroxyethyl}-6-hydroxy-4H-benzo[1,4]oxazin-3-one

HRID 506575Notes

Reaction equation

C([O:8][C:9]1[CH:10]=[C:11]([C:20](=[O:26])[CH:21](OCC)O)[C:12]2[O:17][CH2:16][C:15](=[O:18])[NH:14][C:13]=2[CH:19]=1)C1C=CC=CC=1.[Cl:27][C:28]1[CH:33]=[C:32]([F:34])[CH:31]=[CH:30][C:29]=1[CH2:35][C:36]([NH2:39])([CH3:38])[CH3:37].[BH4-].[Li+].C(CN)O.B(Br)(Br)Br>ClCCl.O>[Cl:27][C:28]1[CH:33]=[C:32]([F:34])[CH:31]=[CH:30][C:29]=1[CH2:35][C:36]([NH:39][CH2:21][CH:20]([C:11]1[C:12]2[O:17][CH2:16][C:15](=[O:18])[NH:14][C:13]=2[CH:19]=[C:9]([OH:8])[CH:10]=1)[OH:26])([CH3:37])[CH3:38]

Participants

Conditions

Temperature: -78 °C

Procedure

357 mg (1 mmol) of 6-benzyloxy-8-(2-ethoxy-2-hydroxyacetyl)-4H-benzo[1,4]oxazin-3-one and 202 mg (1 mmol) of 2-(2-chloro-4-fluorophenyl)-1,1-dimethylethylamine are reacted with lithium borohydride analogously to the method for Example 10(d). To debenzylate the ethanolamine thus obtained, it is dissolved in 3 mL of dichloromethane and cooled to −78° C. At this temperature, 2 mL of a 1 molar solution of boron tribromide in dichloromethane is added and the mixture is slowly allowed to come up to ambient temperature. The reaction mixture is combined with 10 mL dichloromethane and 3 mL water and filtered through an EXTRELUT® column. The eluate is freed from solvent and the residue is purified by chromatography. White solid. Yield: 70 mg (13%, trifluoroethyl acetate); mass spectroscopy: [M+H]+=409/11.

Workup

customthus obtained
customto come up to ambient temperature
filtrationfiltered through an EXTRELUT® column
customthe residue is purified by chromatography

Sources & evidence

ORD record: ord-1bf257615f614462b7dcbe73945330b5
Source dataset: uspto-grants-2010_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07786111B2

Reaction notes

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