Diethyl Ether → beta-Ethenylidene-2-thiopeneethanamine

Participants

Reaction Steps

NiCl2 (dppp) catalyst (170 mg; 3M %) was added to dry ether (30 ml) in a 100 ml 3-necked flask with mechanical stirrer, thermometer and nitrogen bubbler. III (2.47 g, 10.2 mM) was added via syringe with stirring and immediately thereafter 3M thienylmagnesium bromide (7 ml, 21 mM) was added via syringe. After stirring at room temperature for 20 hours the reaction was complete as shown by G C analysis. The silylated product was isolated by shaking with dilute NH4OH and extraction into ethylacetate (three times, each into 100 ml). After drying over K2CO3 and concentration, 2.68 g crude product was obtained. Purification and desilylation by flash chromatography (300 g silica gel, eluted with CHCl3, then CHCl3 :MeOH:conc. NH4OH 100:10:1) gave 1.22 g (87%) of the desired product as a light tan oil after drying under high vacuum.

Provenance & Evidence