Acetic Anhydride → HCID 136109365, compound

HRID 2051554Notes

Reaction equation

HRID 2051554 reaction equation
[CH2:1]([O:3][CH:4]([O:16][CH2:17][CH3:18])[CH2:5][CH2:6][C:7]1[C:12](=[O:13])[NH:11][C:10]([NH2:14])=[N:9][C:8]=1[NH2:15])[CH3:2].C(O[C:23](=[O:25])[CH3:24])(=O)C>N1C=CC=CC=1>[CH2:1]([O:3][CH:4]([O:16][CH2:17][CH3:18])[CH2:5][CH2:6][C:7]1[C:12](=[O:13])[NH:11][C:10]([NH:14][C:1](=[O:3])[CH3:2])=[N:9][C:8]=1[N:15]([C:23](=[O:25])[CH3:24])[C:12](=[O:13])[CH3:7])[CH3:2]

Participants

4

Reactant 2

HCID 7918Acetic AnhydrideHCID 135816675HCID 135816675, compound

Product 1

HCID 136109365HCID 136109365, compound

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

A stirred mixture of 7.20 g (28.1 mmol) of 3-(2,4-diamino-1,6-dihydro-6-oxo-5-pyrimidinyl)propionaldehyde diethyl acetal, 30 ml of dry pyridine and 30 ml of freshly distilled acetic anhydride was heated on an oil bath at 90° for 6 hours and then stirred at ambient temperature overnight. Solution occurred within 15 minutes as a mixture of diacetyl and triacetyl pyrimidinone formed; extended reaction was required to obtain only the title compound. The solution was spin evaporated in vacuo to give an oil. Ethyl acetate was added and spin evaporated several times until a solid was obtained. The solid was dispersed in cyclohexane and collected; yield, 8.88 g (82%), mp 126°-137° (one spot on TLC). Recrystallization of a portion from cyclohexane-ethylacetate gave the analytical sample, mp 138°-139°; TLC (C6H6 :EtOH/5:1); NMR (DMSO-d6) δ 1.08 (t, 6H, 2CH2CH3), 1.63 (m, 2H, CH2CH2CH), 2.13 (s, 3H, Ac), 2.27 (s, 6H, 2Ac), 2.2 (2H, CH2CH2CH, superimposed on the acetyl singlets), 3.2-3.7 (m, 4H, 2×OCH2), 4.42 (t, 1H, CH), 11.87 (br s, 2H, AcNH and HNC(O)).

Workup

  1. temperaturewas heated on an oil bath at 90° for 6 hours
  2. customformed
  3. customextended reaction

Sources & evidence

ORD record
ord-7cd9650246004675871fd9a1ab82169f
Source dataset
uspto-grants-1991_05
Patent number
US05019577

Reaction notes

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