Benzyl Alcohol → N-(tert-butoxycarbonyl)-3-cyclopentyl-L-alanine benzyl ester

HRID 362145Notes

Reaction equation

HRID 362145 reaction equation
[C:1]([O:5][C:6]([NH:8][C@H:9]([C:16]([OH:18])=[O:17])[CH2:10][CH:11]1[CH2:15][CH2:14][CH2:13][CH2:12]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH2:19](O)[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1.ON1C2C=CC=CC=2N=N1.Cl.CN(C)CCCN=C=NCC>CN(C)C1C=CN=CC=1.ClCCl>[CH2:19]([O:17][C:16](=[O:18])[C@H:9]([CH2:10][CH:11]1[CH2:12][CH2:13][CH2:14][CH2:15]1)[NH:8][C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:7])[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1

Participants

7

Reactant 4

HCID 244Benzyl AlcoholHCID 757711-HydroxybenzotriazoleHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 40418614N-(tert-Butoxycarbonyl)-3-cyclopentyl-L-alanine

Product 1

HCID 54072905N-(tert-butoxycarbonyl)-3-cyclopentyl-L-alanine benzyl esterYield 95.5%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalyst2×HCID 6344DichloromethaneSolvent

Procedure

A mixture of 1.2 g (4.67 mmol) of N-(tert-butoxycarbonyl)-3-cyclopentyl-L-alanine, 540 mg (5 mmol) of benzylalcohol, 675 mg (5 mmol) of 1-hydroxybenzotriazole, 1.152 g (6 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.031 g (0.25 mmol) of 4-dimethylaminopyridine was stirred in 20 ml of dichloromethane for 1 hour and then a further 610 mg (5 mmol) of 4-dimethylaminopyridine were added. After 4 hours the solution was extracted with 2M hydrochloric acid and saturated sodium bicarbonate solution, dried over anhydrous magnesium sulphate and evaporated. The oil obtained was chromatographed on silica gel using ethyl acetate/ petrol (1:6) for the elution to give 1.55 g of N-(tert-butoxycarbonyl)-3-cyclopentyl-L-alanine benzyl ester as a colourless oil; MS: m/e 348 [M+H].

Workup

  1. extractionAfter 4 hours the solution was extracted with 2M hydrochloric acid and saturated sodium bicarbonate solution
  2. dry with materialdried over anhydrous magnesium sulphate
  3. customevaporated
  4. customThe oil obtained
  5. customwas chromatographed on silica gel
  6. washfor the elution

Sources & evidence

ORD record
ord-ebf3903d40f34f2684c4c67c97b1d580
Source dataset
uspto-grants-1999_02
Patent number
US05866684

Reaction notes

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