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Diisopropylethylamine → 3-methyl-6-[4-(tetrahydropyran-2-yloxy)butyl]-5,6,7,8-tetrahydro-1H-pyrido[4,3-d]pyrimidine-2,4-dione

HRID 742971
Notes
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Reaction equation

HRID 742971 reaction equation
C(N(C(C)C)C(C)C)C.[Br-].[Li+].Cl[CH2:13][CH2:14][CH2:15][CH2:16][O:17][CH:18]1[CH2:23][CH2:22][CH2:21][CH2:20][O:19]1.[CH3:24][N:25]1[C:30](=[O:31])[C:29]2[CH2:32][NH:33][CH2:34][CH2:35][C:28]=2[NH:27][C:26]1=[O:36]>CN(C)C=O>[CH3:24][N:25]1[C:30](=[O:31])[C:29]2[CH2:32][N:33]([CH2:13][CH2:14][CH2:15][CH2:16][O:17][CH:18]3[CH2:23][CH2:22][CH2:21][CH2:20][O:19]3)[CH2:34][CH2:35][C:28]=2[NH:27][C:26]1=[O:36]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 82050Lithium BromideHCID 1704882H-Pyran, 2-(4-chlorobutoxy)tetrahydro-HCID 102414233-methyl-5,6,7,8-tetrahydro-1H-pyrido[4,3-d]pyrimidine-2,4-dione

Product 1

HCID 194233293-methyl-6-[4-(tetrahydropyran-2-yloxy)butyl]-5,6,7,8-tetrahydro-1H-pyrido[4,3-d]pyrimidine-2,4-dioneYield 51%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

27 g of ethyldiisopropylamine, 18 g of lithium bromide and 46 g of 2-(4-chlorobutoxy) tetrahydropyran (86.3% pure according to GC) were added to 36.3 g of 3-methyl-5,6,7,8-tetrahydro-1H-pyrido[4,3-d]pyrimidine-2,4-dione in 1 l of dimethylformamide, with stirring, and the mixture was stirred for 5 h at 70° C. It was concentrated under reduced pressure and 34.5 g of crude 3-methyl-6-[4-(tetrahydropyran-2-yloxy)butyl]-5,6,7,8-tetrahydro-1H-pyrido[4,3-d]pyrimidine-2,4-dione were obtained after working-up of the residue by extraction with dichloromethane and water and after drying and concentration of the combined dichloromethane phases, and this crude product was purified by column chromatography on aluminum oxide (actiVity grade III) and elution with dichloromethane/ethanol (volume ratio 90:10).

Workup

  1. stirringthe mixture was stirred for 5 h at 70° C
  2. concentrationIt was concentrated under reduced pressure

Sources & evidence

ORD record
ord-7b2a6b2f8d0b47d7a07af6a44b1a050d
Source dataset
uspto-grants-1996_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US05556854

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes