tert-Butyl methyl ether → (S)-3-(5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy)-pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 242304Notes

Reaction equation

HRID 242304 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][C@H:10]([O:13][C:14]2[C:15]3[CH2:23][N:22](CC4C=CC=CC=4)[CH2:21][CH2:20][C:16]=3[N:17]=[CH:18][N:19]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH:31]([O-])=[O:32].[NH4+].CC([O:39]C)(C)C.CC(OC)(C)C.CO>CO.[OH-].[OH-].[Pd+2]>[CH3:2][C:1]([O:5][CH3:6])([CH3:4])[CH3:3].[CH3:31][OH:32].[NH4+:8].[OH-:39].[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][C@H:10]([O:13][C:14]2[C:15]3[CH2:23][NH:22][CH2:21][CH2:20][C:16]=3[N:17]=[CH:18][N:19]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

8

Reactant 4

HCID 15413tert-Butyl methyl etherHCID 2723923Ammonium formateHCID 22277986MTBE methanolHCID 57495302(S)-3-(6-Benzyl-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy)-pyrrolidine-1-carboxylic acid tert-butyl ester

Product 2

HCID 57495303(S)-3-(5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy)-pyrrolidine-1-carboxylic acid tert-butyl esterYield 87%HCID 86663119TBME MeOH NH4OH

Reagents, catalysts & solvents 2

HCID 9942167Palladium hydroxideCatalystHCID 887MethanolSolvent

Procedure

Pd(OH)2/C (1.2 g, 1.71 mmol) was flushed with argon, (S)-3-(6-Benzyl-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy)-pyrrolidine-1-carboxylic acid tert-butyl ester (10.95 g, 26.7 mmol) dissolved in methanol (25 mL) was added followed by the addition of ammonium formate (1.68 g, 26.7 mmol). The reaction mixture was refluxed for 1 h, cooled down to room temperature, filtered through a celite pad and concentrated under vacuum. Purification by flash chromatography on silica gel (CH2Cl2 then TBME then TBME/MeOH 100/0 to 90/10 then TBME/MeOH/NH4OH 85/15/5) gave (S)-3-(5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidin-4-yloxy)-pyrrolidine-1-carboxylic acid tert-butyl ester (7.39 g, 87% yield) as a yellow sticky oil. 1H NMR (400 MHz, methanol-d4, 298K) δ ppm 1.46-1.46 (m, 9 H) 2.10-2.30 (m, 2 H) 2.78-2.83 (m, 2 H) 3.11-3.14 (m, 2 H) 3.41-3.60 (m, 3 H) 3.65-3.72 (m, 1 H) 3.78 (s, 2 H) 5.68 (m, 1 H) 8.52 (s, 1 H). LCMS: [M+H]+=321.2, Rt(2)=0.87 min

Workup

  1. additionwas added
  2. temperatureThe reaction mixture was refluxed for 1 h
  3. filtrationfiltered through a celite pad
  4. concentrationconcentrated under vacuum
  5. customPurification by flash chromatography on silica gel (CH2Cl2

Sources & evidence

ORD record
ord-ff84bfecdc724508a3ac035751ebbb4b
Source dataset
uspto-grants-2014_02
Patent number
US08653092B2

Reaction notes

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