Stannous chloride dihydrate → 2-[(2-Aminobenzyl)-(4-methoxybenzenesulfonyl)amino]-3-hydroxypropionic acid, tert-butyl ester

HRID 1264575Notes

Reaction equation

[OH:1][CH2:2][CH:3]([N:11]([S:22]([C:25]1[CH:30]=[CH:29][C:28]([O:31][CH3:32])=[CH:27][CH:26]=1)(=[O:24])=[O:23])[CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][C:14]=1[N+:19]([O-])=O)[C:4]([O:6][C:7]([CH3:10])([CH3:9])[CH3:8])=[O:5].O.O.Cl[Sn]Cl>CO>[NH2:19][C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][C:13]=1[CH2:12][N:11]([S:22]([C:25]1[CH:26]=[CH:27][C:28]([O:31][CH3:32])=[CH:29][CH:30]=1)(=[O:24])=[O:23])[CH:3]([CH2:2][OH:1])[C:4]([O:6][C:7]([CH3:9])([CH3:8])[CH3:10])=[O:5]

Participants

Conditions

Temperature: 90 °C

Procedure

A mixture of 0.60 g (1.28 mmol) of 3-hydroxy-2-[(4-methoxybenzenesulfonyl)-(2-nitrobenzyl)amino]propionic acid, tert-butyl ester and 1.45 g (6.45 mmol) of SnCl2.2H2O in 20 ml of methanol was heated in an oil bath at 90° C. for 2 hours. The solvent was removed under vacuum and ethyl acetate added to the residue. The mixture was neutralized with saturated sodium bicarbonate solution and filtered through diatomaceous earth. The ethyl acetate layer was separated and washed with H2O, brine and dried with Na2SO4. The solvent was removed under vacuum to give 0.30 g (53%) of a gum. Anal. for C21H28N2O6S: Calc'd: C, 57.8; H, 6.5; N, 6.4; Found: C, 57.8; H, 7.0; N, 6.2.

Workup

customThe solvent was removed under vacuum and ethyl acetate
additionadded to the residue
filtrationfiltered through diatomaceous earth
customThe ethyl acetate layer was separated
washwashed with H2O, brine
dry with materialdried with Na2SO4
customThe solvent was removed under vacuum

Sources & evidence

ORD record: ord-fce14ac73dd24197b5837052c6e6f027
Source dataset: uspto-grants-2003_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06544984B1

Reaction notes

Loading…