Reaktion #637123

Reaktionsgleichung

ammonium chloride

potassium tert.-butoxide

(1-naphthylmethyl)triphenylphosphonium chloride

tert-butyl 4-(4-formyl-1,3-thiazol-2-yl)piperidine-1-carboxylate

→

tert-Butyl 4-{4-[(Z)-2-(naphthalen-1-yl)ethenyl]-1,3-thiazol-2-yl}piperidine-1-carboxylate

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe mixture is stirred at 0° C. for another 30 min
2. 2
   Temperaturslowly warmed to room temperature
3. 3
   workup.WAITAfter a further 20 min
4. 4
   Sonstigethe aqueous phase is separated off
5. 5
   ExtraktionAfter extraction of the aqueous phase with ethyl acetate
6. 6
   Trocknenthe combined organic phases are dried over sodium sulphate
7. 7
   Einengenconcentrated under reduced pressure
8. 8
   SonstigeAfter chromatographic purification

Vorschrift

Under argon, (1-naphthylmethyl)triphenylphosphonium chloride (2.96 g) is dissolved in 20 ml of tetrahydrofuran and cooled to 0° C., and potassium tert.-butoxide (757 mg) is added, whereupon the colour of the solution changes to dark-red. After 10 min of stirring, tert-butyl 4-(4-formyl-1,3-thiazol-2-yl)piperidine-1-carboxylate (1.00 g) is added. The mixture is stirred at 0° C. for another 30 min and then slowly warmed to room temperature. After a further 20 min, saturated ammonium chloride solution is added, and the aqueous phase is separated off. After extraction of the aqueous phase with ethyl acetate, the combined organic phases are dried over sodium sulphate and concentrated under reduced pressure. After chromatographic purification, this gives tert-butyl 4-{4-[(Z)-2-(naphthalen-1-yl)ethenyl]-1,3-thiazol-2-yl}piperidine-1-carboxylate (1.2 g, Z isomer).

Quelle