3-(Boc-amino)-L-alanine → N-[(4-{(2S)-3-(Allyloxy)-2-[(tert-butoxycarbonyl)amino]-3-oxopropyl}phenoxy)carbonyl]-3-[(tert-butoxycarbonyl)amino]-L-alanine

HRID 630669Notes

Reaction equation

[CH2:1]([O:4][C:5](=[O:35])[C@H:6]([CH2:15][C:16]1[CH:21]=[CH:20][C:19]([O:22][C:23](OC2C=CC([N+]([O-])=O)=CC=2)=[O:24])=[CH:18][CH:17]=1)[NH:7][C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH:2]=[CH2:3].[C:36]([O:40][C:41]([NH:43][CH2:44][C@@H:45]([C:47]([OH:49])=[O:48])[NH2:46])=[O:42])([CH3:39])([CH3:38])[CH3:37]>ClC(Cl)C>[CH2:1]([O:4][C:5](=[O:35])[C@@H:6]([NH:7][C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:15][C:16]1[CH:21]=[CH:20][C:19]([O:22][C:23]([NH:46][C@H:45]([C:47]([OH:49])=[O:48])[CH2:44][NH:43][C:41]([O:40][C:36]([CH3:39])([CH3:37])[CH3:38])=[O:42])=[O:24])=[CH:18][CH:17]=1)[CH:2]=[CH2:3]

Participants

Conditions

Temperature: 85 °C

Procedure

2.45 g (5.0 mmol) of the compound from example 1A was dissolved in 40 ml dichloroethane. 1.03 g, (5.0 mmol) 3-[(tert-Butoxycarbonyl)amino]-L-alanine was added. The reaction mixture was heated to 85° C. for 2 h. The solvent was removed under reduced pressure. The raw product was dissolved in dichloromethane and chromatographed over approx. 150 ml silica gel. Solvents used were dicloromethane/methanol 20/1 to dichloromethane/methanol 1/1. The product-containing fractions were combined and concentrated to dryness under reduced pressure. This gave 1.23 g (2.2 mmol, 44% of theory) of the desired product.

Workup

customThe solvent was removed under reduced pressure
dissolutionThe raw product was dissolved in dichloromethane
customchromatographed over approx. 150 ml silica gel
concentrationconcentrated to dryness under reduced pressure

Sources & evidence

ORD record: ord-9ec7729c2bf64559bfa316e99d8bb6c2
Source dataset: uspto-grants-2016_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09315543B2

Reaction notes

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