6-amino-3,4-dihydro-2H-1,4-benzoxazin-3-one → 6-[(S)-3-(tert-butyl-dimethyl-silanyloxy)-2-hydroxy-propylamino]-4H-benzo[1,4]oxazin-3-one

HRID 1890432Notes

Reaction equation

[C:1]([Si:5]([CH3:12])([CH3:11])[O:6][CH2:7][C@@H:8]1[CH2:10][O:9]1)([CH3:4])([CH3:3])[CH3:2].[NH2:13][C:14]1[CH:15]=[CH:16][C:17]2[O:22][CH2:21][C:20](=[O:23])[NH:19][C:18]=2[CH:24]=1>CC#N>[C:1]([Si:5]([CH3:12])([CH3:11])[O:6][CH2:7][C@@H:8]([OH:9])[CH2:10][NH:13][C:14]1[CH:15]=[CH:16][C:17]2[O:22][CH2:21][C:20](=[O:23])[NH:19][C:18]=2[CH:24]=1)([CH3:4])([CH3:3])[CH3:2]

Participants

Conditions

Temperature: 50 °C

Procedure

To a solution of tert-butyl-dimethyl-((S)-1-oxiranylmethoxy)-silane (commercial; 4.25 g, 22.6 mmol) in MeCN (70 mL) was added LiClO4 (7.20 g, 3 eq.). 6-amino-4H-benzo[1,4]oxazin-3-one (commercial; 3.70 g, 1 eq.) was then added and the mixture was stirred at 50° C. for 6 h. The solvent was removed under reduced pressure and the residue was purified by CC (DCM/MeOH/NH4OH 1000/25/2) to afford the title intermediate as a pale brown foam (5.25 g, 66% yield).

Workup

customThe solvent was removed under reduced pressure
customthe residue was purified by CC (DCM/MeOH/NH4OH 1000/25/2)

Sources & evidence

ORD record: ord-4787e47679664b1ca8920b0256fdb5e6
Source dataset: uspto-grants-2013_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08507478B2

Reaction notes

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