Benzyl chloroformate → 2-[(benzyloxy)carbonyl]-1H,2H,3H,4H,9H-pyrido[3,4-b]indole-1-carboxylic acid

HRID 54084Notes

Reaction equation

HRID 54084 reaction equation
[CH:1]1([C:14]([OH:16])=[O:15])[C:6]2[NH:7][C:8]3[C:13]([C:5]=2[CH2:4][CH2:3][NH:2]1)=[CH:12][CH:11]=[CH:10][CH:9]=3.Cl[C:18]([O:20][CH2:21][C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)=[O:19]>[OH-].[Na+].O.O1CCOCC1>[CH2:21]([O:20][C:18]([N:2]1[CH2:3][CH2:4][C:5]2[C:13]3[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=3)[NH:7][C:6]=2[CH:1]1[C:14]([OH:16])=[O:15])=[O:19])[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1

Participants

6

Reactant 2

HCID 10387Benzyl chloroformateHCID 1458792,3,4,9-Tetrahydro-1H-pyrido(3,4-b)indole-1-carboxylic acid

Product 1

HCID 190319922-[(benzyloxy)carbonyl]-1H,2H,3H,4H,9H-pyrido[3,4-b]indole-1-carboxylic acid

Reagents, catalysts & solvents 3

HCID 962WaterSolvent2×HCID 14798Sodium HydroxideSolvent2×HCID 312751,4-DioxaneSolvent2×

Procedure

To a solution, cooled in ice, of 3.0 g of 1,2,3,4-tetrahydropyrido[3,4-b]indole-1-carboxylic acid in 7 ml of 2M sodium hydroxide solution, 17 ml of water and 17 ml of dioxan were added in alternating portions 12.5 ml of 2M sodium hydroxide solution and a solution of 3.6 ml of benzyl chloroformate in 9 ml of dioxan. After completion of the additions the mixture was stirred at room temperature overnight and the dioxan-was then removed by evaporation under reduced pressure. The solution obtained was diluted with water, washed twice with diethyl ether, acidified with 25 ml of 1M sulphuric acid and extracted three times with ethyl acetate. The organic extracts were combined, washed twice with water, dried over anhydrous magnesium sulphate and evaporated to give 4.54 g of 2-benzyloxycarbonyl-1,2,3,4-tetrahydropyrido[3,4-b]indole-1-carboxylic acid, MS: m/e 351 [M+H]+, which was used without purification.

Workup

  1. additionwere added
  2. customthe dioxan-was then removed by evaporation under reduced pressure
  3. customThe solution obtained
  4. washwashed twice with diethyl ether
  5. extractionextracted three times with ethyl acetate
  6. washwashed twice with water
  7. dry with materialdried over anhydrous magnesium sulphate
  8. customevaporated

Sources & evidence

ORD record
ord-0edde3a643e240ed8791c3430222056f
Source dataset
uspto-grants-1997_04
Patent number
US05620987

Reaction notes

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