Tetrahydrofuran → Ethyl 2-amino-3-t-butyldimethylsilyloxy-3-(2-chloropyridin-3-yl)propionate
Reaction equation
[N:1]([CH:4]([CH:10]([O:18][Si:19]([C:22]([CH3:25])([CH3:24])[CH3:23])([CH3:21])[CH3:20])[C:11]1[C:12]([Cl:17])=[N:13][CH:14]=[CH:15][CH:16]=1)[C:5]([O:7][CH2:8][CH3:9])=[O:6])=[N+]=[N-].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.O1CCCC1>O>[NH2:1][CH:4]([CH:10]([O:18][Si:19]([C:22]([CH3:23])([CH3:25])[CH3:24])([CH3:21])[CH3:20])[C:11]1[C:12]([Cl:17])=[N:13][CH:14]=[CH:15][CH:16]=1)[C:5]([O:7][CH2:8][CH3:9])=[O:6]Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Procedure
A mixture of 5.6 g of ethyl 2-azido-3-t-butyl-dimethylsilyloxy-3-(2-chloropyridin-3-yl)propionate (prepared as described in Preparation 77), 7.5 g of triphenylphosphine and 18 ml of a 8:1 by volume mixture of tetrahydrofuran and water was stirred at room temperature for 3 hours. At the end of this time, the reaction mixture was freed from the solvent by distillation. The residue was purified by column chromatography through silica gel, using a 5:1 by volume mixture of hexane and ethyl acetate and subsequently a 50:1 by volume mixture of methylene chloride and methanol as the eluent, to give 5.9 g of the title compound having Rf=0.59 (on silica gel thin layer chromatography using a 15:1 by volume mixture of methylene chloride and methanol as the developing solvent).
Workup
- distillationAt the end of this time, the reaction mixture was freed from the solvent by distillation
- customThe residue was purified by column chromatography through silica gel
- additionby volume mixture of hexane and ethyl acetate
- additionsubsequently a 50:1 by volume mixture of methylene chloride and methanol as the eluent
Sources & evidence
- ORD record
- ord-1e3585ddd22b460382e6d0614df00dc8
- Source dataset
- uspto-grants-2000_09
- Patent number
- US06117893
Reaction notes
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