Reaktion #1244275

Reaktionsgleichung

water

EtOAc

EtOAc

triethylorthoacetate

2-Azidopropane-1,3-diol

→

24

Ausbeute 57.3%

2-Azido-3-hydroxypropyl acetate

Ausbeute 57.3%

Lösungsmittel

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   Einengenconcentrated in vacuo
2. 2
   SonstigePurification of the residue on a silica gel cartridge

Vorschrift

2-Azidopropane-1,3-diol 23 (10.46 g, 89.3 mmol) was dissolved in CH2Cl2 (450 mL) and treated with a catalytic amount of p-toluene sulfonic acid monohydrate (340 mg, 1.8 mmol) and triethylorthoacetate (24.4 mL, 134 mmol) at room temperature for 1 hr. After the formation of the orthoester was complete, a stoichiometric amount of water (2.4 mL, 134 mmol) was added to the mixture. The mixture was then stirred for 40 min and then concentrated in vacuo. Purification of the residue on a silica gel cartridge using EtOAc:Hex as the eluent (5% EtOAc to 100% EtOAc) afforded 8.14 g (57% yield) of 24 as a clear, colorless oil. 1H NMR (CDCl3, 400 MHz), δ: 2.45 (1H, br s), 2.12 (3H, s), 3.63-3.78 (3H, m), 4.20-4.30 (2H, m).

Quelle