Diisopropylethylamine → [(3,5-Bis-benzyloxy-pyridine-2-carbonyl)-amino]-acetic acid tert-butyl ester

HRID 1908303Notes

Reaction equation

HRID 1908303 reaction equation
[CH2:1]([O:8][C:9]1[C:10]([C:23](O)=[O:24])=[N:11][CH:12]=[C:13]([O:15][CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[CH:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl.[C:27]([O:31][C:32](=[O:35])[CH2:33][NH2:34])([CH3:30])([CH3:29])[CH3:28].C(N(C(C)C)CC)(C)C>CN(C=O)C.ON1C2C=CC=CC=2N=N1>[C:27]([O:31][C:32](=[O:35])[CH2:33][NH:34][C:23]([C:10]1[C:9]([O:8][CH2:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)=[CH:14][C:13]([O:15][CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)=[CH:12][N:11]=1)=[O:24])([CH3:30])([CH3:29])[CH3:28]

Participants

6

Reactant 3

HCID 81531DiisopropylethylamineHCID 2725036Glycine tert-butyl ester hydrochlorideHCID 534879953,5-Bis(benzyloxy)picolinic acid

Product 1

HCID 59513083[(3,5-Bis-benzyloxy-pyridine-2-carbonyl)-amino]-acetic acid tert-butyl esterYield 99%

Reagents, catalysts & solvents 2

HCID 757711-HydroxybenzotriazoleCatalystHCID 6228DimethylformamideSolvent

Procedure

To a solution of 3,5-bis-benzyloxy-pyridine-2-carboxylic acid, 2, (2.36 g, 6.36 mmol) in DMF (20 mL) at room temperature under N2 is added 1-(3-dimethyl-aminopropyl)-3-ethylcarbodiimide (EDCI) (1.83 g, 9.54 mmol) and 1-hydroxybenzo-triazole (HOBt) (0.086 g, 0.64 mmol). The mixture is stirred for 15 minutes after which time glycine tert-butyl ester hydrochloride (1.60 g, 9.54 mmol) and diisopropylethylamine (DIPEA) (3.32 ml, 19.08 mmol) are added. The resulting solution is stirred at room temperature for 48 hours then concentrated under reduced pressure. The resulting brown oil is purified over silica (EtOAc) to afford 3.04 g (99% yield) of the desired compound as a yellow solid. 1H NMR (250 MHz, CDCl3) δ ppm 8.19 (1H, t, J=5.2 Hz), 8.01-8.08 (2H, m), 7.27-7.54 (9H, m), 6.97 (1H, d, J=2.4 Hz), 5.24 (2H, s), 5.13 (2H, s), 4.17 (2H, d, J=5.2 Hz), 1.51 (9H, s). HPLC-MS: m/z 449 [M+H]+.

Workup

  1. additionare added
  2. concentrationthen concentrated under reduced pressure
  3. customThe resulting brown oil is purified over silica (EtOAc)

Sources & evidence

ORD record
ord-fdc8f631df9e421aad90383356fa5983
Source dataset
uspto-grants-2013_12
Patent number
US08598210B2

Reaction notes

Loading…