Nitromethane → N-(4-Fluoro-2-(3-methylisoxazol-5-yl)benzyl)-3-(benzyloxy)-9,9-dimethyl-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxamide

HRID 348205Notes

Reaction equation

HRID 348205 reaction equation
[C:1]([C:3]1[CH:33]=[C:32]([F:34])[CH:31]=[CH:30][C:4]=1[CH2:5][NH:6][C:7]([C:9]1[N:10]=[C:11]2[N:16]([C:17](=[O:27])[C:18]=1[O:19][CH2:20][C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1)[CH2:15][CH2:14][O:13][C:12]2([CH3:29])[CH3:28])=[O:8])#[CH:2].[N+:35]([CH3:38])([O-])=[O:36].[Cl-].[CH3:40]OC1N=C(OC)N=C([N+]2(C)CCOCC2)N=1>CS(C)=O.CN(C)C1C=CN=CC=1.C(OCC)(=O)C>[F:34][C:32]1[CH:31]=[CH:30][C:4]([CH2:5][NH:6][C:7]([C:9]2[N:10]=[C:11]3[N:16]([C:17](=[O:27])[C:18]=2[O:19][CH2:20][C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[CH2:15][CH2:14][O:13][C:12]3([CH3:29])[CH3:28])=[O:8])=[C:3]([C:1]2[O:36][N:35]=[C:38]([CH3:40])[CH:2]=2)[CH:33]=1

Participants

7

Reactant 3

HCID 6375Nitromethane2×HCID 27340594-(4,6-Dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride2×HCID 21069992N-(2-Ethynyl-4-fluorobenzyl)-3-(benzyloxy)-9,9-dimethyl-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxamide

Product 1

HCID 21070011N-(4-Fluoro-2-(3-methylisoxazol-5-yl)benzyl)-3-(benzyloxy)-9,9-dimethyl-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxamideYield 73.5%

Reagents, catalysts & solvents 3

HCID 142844-(Dimethylamino)pyridineCatalyst2×HCID 679Dimethyl SulfoxideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
22 °C

Procedure

A solution of intermediate 179, N-(2-ethynyl-4-fluorobenzyl)-3-(benzyloxy)-9,9-dimethyl-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxamide (0.150 g, 0.32 mmol) in dimethyl sulfoxide (5 ml) was treated with nitromethane (0.14 ml, 1.92 mmol), 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMTMM) (0.241 g, 1.0 mmol) (M. Kunishima et al., Tetrahedron, 55, 1999, 13159–13170) and 4-(dimethylamino)pyridine (DMAP) (0.010 g) and the resulting mixture stirred at 22° C. for 16 h. Identical quantities of nitromethane, DMTMM and DMAP were then added and the mixture was stirred for another 24 h. The reaction mixture was diluted with ethyl acetate, washed with saturated sodium bicarbonate and brine, then dried over anhydrous magnesium sulfate and concentrated under reduced pressure. Chromatography of the residue on silica gel (elution gradient of ethyl acetate in dichloromethane) gave 0.122 g (73% yield) of the title material as a white solid. 1HNMR 400 MHz (CDCl3) δ ppm: 1.62 (6H, s, 2×CH3), 2.39 (3H, s, CH3), 4.04 (4H, m, 2×CH2), 4.69 (2H, d, J=6.1 Hz, NCH2), 5.31 (2H, s, OCH2), 6.36 (1H, m, CH), 7.13 (1H, m, aromatic), 7.30–7.35 (4H, m, aromatics), 7.50–7.53 (2H, m, aromatics), 7.58 (1H, dd, J=5.5 Hz and J=8.6 Hz, aromatic), 8.06 (1H, broad t, NH). HRMS (ESI+) calculated for C28H28FN4O5 [M+H+]: 519.2044. Found: 519.2059.

Workup

  1. stirringthe mixture was stirred for another 24 h
  2. washwashed with saturated sodium bicarbonate and brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-8eab146c418a459cbf0f3f9c7348b447
Source dataset
uspto-grants-2007_02
Patent number
US07176196B2

Reaction notes

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