Reaktion #622326

Reaktionsgleichung

ethyl N-(diphenylmethylidene)glycinate

cesium hydroxide monohydrate

4-(2-bromoethylidene)tetrahydro-2H-pyran

→

title compound

ethyl 2-[(diphenylmethylidene)amino]-4-(tetrahydro-4H-pyran-4-ylidene)butanoate

Lösungsmittel

dichloromethane

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction was partitioned between dichloromethane and water
2. 2
   Extraktionthe aqueous layer was extracted with dichloromethane
3. 3
   TrocknenThe organic layer was dried over sodium sulfate
4. 4
   Einengenconcentrated in vacuo
5. 5
   SonstigeThe residue was purified by silica gel chromatography
6. 6
   Wascheneluting with 5-40% hexanes/EtOAc

Vorschrift

To a solution of ethyl N-(diphenylmethylidene)glycinate (5.29 g, 19.8 mmol), benzyltriethylammonium chloride (0.41 g, 1.8 mmol) and cesium hydroxide monohydrate (4.54 g, 27.0 mmol) in anhydrous dichloromethane (50 mL) was added 4-(2-bromoethylidene)tetrahydro-2H-pyran (3.44 g, 18.0 mmol) as a solution in anhydrous dichloromethane (40 mL) and the reaction stirred at room temperature for 72 h under nitrogen. The reaction was partitioned between dichloromethane and water and the aqueous layer was extracted with dichloromethane. The organic layer was dried over sodium sulfate and concentrated in vacuo. The residue was purified by silica gel chromatography eluting with 5-40% hexanes/EtOAc to afford the title compound as a clear oil in quantitative yield.

Quelle