Diphenyl carbonate → phenyl 6-(((tert-butyldimethylsilyl)oxy)methyl)-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxylate

HRID 1777885Notes

Reaction equation

HRID 1777885 reaction equation
[Si:1]([O:8][CH2:9][C:10]1[CH:11]=[C:12]2[C:17](=[N:18][C:19]=1[CH:20]([O:23][CH3:24])[O:21][CH3:22])[NH:16][CH2:15][CH2:14][CH2:13]2)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[C:25](=O)([O:33]C1C=CC=CC=1)[O:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1.[Li+].C[Si]([N-][Si](C)(C)C)(C)C.[NH4+].[Cl-]>C1COCC1>[Si:1]([O:8][CH2:9][C:10]1[CH:11]=[C:12]2[C:17](=[N:18][C:19]=1[CH:20]([O:23][CH3:24])[O:21][CH3:22])[N:16]([C:25]([O:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1)=[O:33])[CH2:15][CH2:14][CH2:13]2)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

Participants

6

Reactant 4

HCID 7597Diphenyl carbonateHCID 25517Ammonium ChlorideHCID 2733832Lithium HexamethyldisilazideHCID 1317347776-(((Tert-butyldimethylsilyl)oxy)methyl)-7-(dimethoxymethyl)-1,2,3,4-tetrahydro-1,8-naphthyridine2×

Product 1

HCID 131734775phenyl 6-(((tert-butyldimethylsilyl)oxy)methyl)-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxylate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
-78 °C

Procedure

To a solution of 6-(((tert-butyldimethylsilyl)oxy)methyl)-7-(dimethoxymethyl)-1,2,3,4-tetrahydro-1,8-naphthyridine (intermediate 39, 8.49 g, 24.1 mmol) and diphenyl carbonate (5.42 g, 25.3 mmol) in THF (130 ml) at −78° C. was added slowly LHMDS (1 M in THF, 25.3 ml, 25.3 mmol). The reaction mixture was stirred at −78° C. for 30 min, then allowed to warm to room temperature. The reaction mixture was poured into sat. aq. NH4Cl and extracted twice with DCM. The combined organic phases were then dried over Na2SO4, filtered and concentrated. The crude material was purified by normal phase chromatography (330 g silica gel cartridge, heptanes/EtOAc 100:0 to 50:50) to give the title compound as a light yellow oil. 1H NMR (400 MHz, DMSO-d6) δ 7.68 (s, 1H), 7.37-7.45 (m, 2H), 7.19-7.27 (m, 3H), 5.17 (s, 1H), 4.84 (s, 2H), 3.80-3.86 (m, 2H), 3.27 (s, 6H), 2.84 (t, 2H), 1.91-2.02 (m, 2H), 0.91 (s, 9H), 0.08 (s, 6H).

Workup

  1. temperatureto warm to room temperature
  2. extractionextracted twice with DCM
  3. dry with materialThe combined organic phases were then dried over Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe crude material was purified by normal phase chromatography (330 g silica gel cartridge, heptanes/EtOAc 100:0 to 50:50)

Sources & evidence

ORD record
ord-15eeca0fb821434292a943dc6d9bf64f
Source dataset
uspto-grants-2016_02
Patent number
US09266883B2

Reaction notes

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