Cyclopropanecarboxaldehyde → trans-N-methyl-N-methoxy-3-cyclopropylpropenamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of N-methoxy-N-methyl diethylphosphonoacetamide (34.56 g, 144.5 mmol) in THF (200 mls) at -78° C., was added n-butyllithium (57.8 mls of a 2.5M solution in hexanes, 144.5 mmol) dropwise. Upon completion of addition, the mixture was stirred for 30 mins at -78° C. A solution of cyclopropanecarboxaldehyde (6.75 g, 96.3 mmol) in THF (50 mls) was then added dropwise. Upon completion of addition, the cooling bath was withdrawn and the reaction allowed to warm to r.t. It was then diluted with aqueous sat'd NH4Cl (200 mls) and the THF was stripped off in vacuo. The aqueous residue was extracted with ethylacetate (3×200 mls). The organics were combined, dried with MgSO4 and concentrated. The resulting residue was chromatographed (silica gel, ether:hexanes, 3:2) to afford 14.09 g (94%) of trans-N-methyl-N-methoxy-3-cyclopropylpropenamide as a colorless oil.

Herkunft & Nachweise