Reaktion #1131931

Reaktionsgleichung

Ms-Cl

N2

(2-(2-methyl-[1,3]dioxolan-2-yl)thiazol-5-yl)methanol

Et3N

→

(2-(2-methyl-[1,3]dioxolan-2-yl)thiazol-5-yl)methyl methanesulfonate

Lösungsmittel

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe reaction was quenched with water (10 mL)
2. 2
   Trocknenlayer was dried over MgSO4
3. 3
   Filtrationfiltered
4. 4
   Sonstigethe solvents were removed under reduced pressure
5. 5
   SonstigePurification by FC (1:1->1:2 hept-EA+1% Et3N)

Vorschrift

In a flame dried round-bottomed flask equipped with a magnetic stir bar and under inert atmosphere (N2), a solution of (2-(2-methyl-[1,3]dioxolan-2-yl)thiazol-5-yl)methanol (389 mg, 1.93 mmol) in dry CH2Cl2 (10 mL) was treated at 0° C. with Et3N (0.35 mL, 2.50 mmol) followed by DMAP (24 mg, 0.19 mmol) and Ms-Cl (0.19 mL, 2.40 mmol). After stirring at 0° C. for 1 h, the reaction was quenched with water (10 mL). The org. layer was dried over MgSO4, filtered, and the solvents were removed under reduced pressure. Purification by FC (1:1->1:2 hept-EA+1% Et3N) gave pure (2-(2-methyl-[1,3]dioxolan-2-yl)thiazol-5-yl)methyl methanesulfonate as a pale yellow oil. Part of this material (140 mg, 0.50 mmol) was dissolved in dry DMF (1 mL) and treated with NaN3 (35 mg, 0.53 mmol) at 80° C. for 1 h30. The reaction mixture was then cooled down to rt and partitioned between EA and water. The layers were separated and the org. layer dried over MgSO4, filtered and concentrated under reduced pressure to give crude 5-(azidomethyl)-2-(2-methyl-[1,3]dioxolan-2-yl)thiazole as a brown oil. LC-MS-conditions 01: tR=0.80 min; [M+H]+=226.96.

Quelle