(5S)-3-methyl-5-phenyl-5,6-dihydro-2H-1,4-oxazin-2-one → HCID 59843754, compound

HRID 1948812Notes

Reaction equation

HRID 1948812 reaction equation
[CH3:1][C:2]1[C:3](=[O:14])[O:4][CH2:5][C@H:6]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[N:7]=1>ClCCl.O=[Pt]=O>[CH3:1][C@H:2]1[NH:7][C@@H:6]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[CH2:5][O:4][C:3]1=[O:14]

Participants

4

Reactant 1

HCID 57467834(5S)-3-methyl-5-phenyl-5,6-dihydro-2H-1,4-oxazin-2-one

Product 1

HCID 59843754HCID 59843754, compoundYield 74%

Reagents, catalysts & solvents 2

HCID 345198Adams' catalystCatalystHCID 6344DichloromethaneSolvent

Procedure

To a solution of (5S)-3-methyl-5-phenyl-5,6-dihydro-2H-1,4-oxazin-2-one (1.70 g, 9.0 mmol, 1.0 equiv.) in anhydrous dichloromethane (60 mL) under an atmosphere of nitrogen was added PtO2 (170 mg, 0.1 equiv.). The mixture was consecutively degassed and purged three times with hydrogen and then stirred for 5 hours under an atmosphere of hydrogen. Filtration through a short pad of CELITE® diatomaceous earth and removal of solvent from the filtrate in vacuo yielded the crude product which was purified by recrystallisation in dichloromethane, diethyl ether and hexane to furnish the title compound as white needles (1.26 g, 74%); m.p. 81.0-82.0° C. (lit. m.p. 81.0-82.0° C.); v(max)(KBr) 3314 (N—H), 2981 (C—H), 1736 (C═O), cm−1; δH (250 MHz, CDCl3) 7.43-7.26 (5H, m, Ph); 4.42-4.23 (3H, m, CHCl2), 3.88 (1H, q, /6.76 Hz, CHCH3), 1.80 (1H, br, NH), 1.50 (3H, d, J 6.76 Hz, CH3); δc (62.5 MHz, CDCl3) 170.7, 138.1, 129.3, 129.1, 127.5, 75.4, 58.2, 55.4, 19.0; m/z (CL, NH3), 192 (MH+, 30%), 147 (68%), 132 (64%), 104 (100%), and 91 (10%); HRMS for C11H13NO2 requires 192.1025 found 192.1019. [α]D20 +88.8 (c 0.96 CHCl3) (lit. [α]D20 +92.3 (c 0.84 CHCl3)).

Workup

  1. customThe mixture was consecutively degassed
  2. custompurged three times with hydrogen
  3. filtrationFiltration
  4. customthrough a short pad of CELITE® diatomaceous earth and removal of solvent from the filtrate in vacuo
  5. customyielded the crude product which
  6. customwas purified by recrystallisation in dichloromethane

Sources & evidence

ORD record
ord-238b5f549cf24eccbbd8dbb51ad2e4ea
Source dataset
uspto-grants-2013_03
Patent number
US08399612B2

Reaction notes

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