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

HRID 12119Notes

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-68992909e6e54c8bb9f71e7686ac5303
Source dataset: uspto-grants-2010_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07727984B2

Reaction notes

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