Sodium Bicarbonate → 6-{[(2-{4-[6-(methyloxy)-1,5-naphthyridin-4-yl]-2-oxo-1-piperazinyl}ethyl)amino]methyl}-2H-pyrido[3,2-b][1,4]thiazin-3(4H)-one

HRID 1787695Notes

Reaction equation

HRID 1787695 reaction equation
[NH2:1][CH2:2][CH2:3][N:4]1[CH2:9][CH2:8][N:7]([C:10]2[C:19]3[C:14](=[CH:15][CH:16]=[C:17]([O:20][CH3:21])[N:18]=3)[N:13]=[CH:12][CH:11]=2)[CH2:6][C:5]1=[O:22].C([O-])(O)=O.[Na+].[O:28]=[C:29]1[CH2:34][S:33][C:32]2[CH:35]=[CH:36][C:37]([CH:39]=O)=[N:38][C:31]=2[NH:30]1.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>C(Cl)Cl.CCO>[CH3:21][O:20][C:17]1[N:18]=[C:19]2[C:14](=[CH:15][CH:16]=1)[N:13]=[CH:12][CH:11]=[C:10]2[N:7]1[CH2:8][CH2:9][N:4]([CH2:3][CH2:2][NH:1][CH2:39][C:37]2[CH:36]=[CH:35][C:32]3[S:33][CH2:34][C:29](=[O:28])[NH:30][C:31]=3[N:38]=2)[C:5](=[O:22])[CH2:6]1

Participants

6

Reactant 4

HCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 115935913-Oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine-6-carbaldehydeHCID 575995921-(2-Aminoethyl)-4-[6-(methyloxy)-1,5-naphthyridin-4-yl]-2-piperazinone

Product 1

HCID 116986476-{[(2-{4-[6-(methyloxy)-1,5-naphthyridin-4-yl]-2-oxo-1-piperazinyl}ethyl)amino]methyl}-2H-pyrido[3,2-b][1,4]thiazin-3(4H)-oneYield 67%

Reagents, catalysts & solvents 1

HCID 21584144Dichloromethane ethanolSolvent

Procedure

To a solution of 1-(2-aminoethyl)-4-[6-(methyloxy)-1,5-naphthyridin-4-yl]-2-piperazinone (46 mg, 0.15 mmol) in DCM-EtOH (2 mL, 1:1) were added NaHCO3 (32 mg, 0.38 mmol) and 3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]thiazine-6-carbaldehyde (29 mg, 0.15 mmol). After 12 h, NaBH(OAc)3 (38 mg, 0.15 mmol) was added. After an additional 2 h the solution was partitioned between NaHCO3 (sat)-DCM. The aqueous phase was extracted several times with DCM and the combined organic fractions were dried (Na2SO4), concentrated and purified via column chromatography (silica, 0-7% MeOH in DCM (1% NH4OH)) yielding the title compound (48 mg, 67%) as a yellow solid: LCMS (ES) m/e 480 (M+H)+; 1H NMR (CD3OD, 400 MHz) δ 8.44 (d, J=5.3 Hz, 1H), 8.12 (d, J=9.0 Hz, 1H), 7.63 (d, J=7.8 Hz, 1H), 7.17 (d, J=9.0 Hz, 1H), 7.00 (d, J=7.8 Hz, 1H), 6.96 (d, J=5.2 Hz, 1H), 4.21 (s, 2H), 4.19-4.22 (m, 2H), 4.03 (s, 3H), 3.82 (s, 2H), 3.69-3.74 (m, 4H), 3.67 (s, 2H), 2.90-2.93 (m, 2H).

Workup

  1. customAfter an additional 2 h the solution was partitioned between NaHCO3 (sat)-DCM
  2. extractionThe aqueous phase was extracted several times with DCM
  3. dry with materialthe combined organic fractions were dried (Na2SO4)
  4. concentrationconcentrated
  5. custompurified via column chromatography (silica, 0-7% MeOH in DCM (1% NH4OH))

Sources & evidence

ORD record
ord-2ae3b251d7e34edebd37796d5fde55d4
Source dataset
uspto-grants-2009_03
Patent number
US07511035B2

Reaction notes

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