Reaction of secondary amines with acetylenic γ-hydroxyaldehydes and γ-ketoacetals

1.	The reaction of acetylenic -hydroxyaldehydes with secondary amines in a methanolic medium leads to the formation of 2-methoxy-4-dialkylamino-5,5-dialkyldihydrofurans.
2.	Protection of the hydroxyl group in the acetylenic -hydroxyketones allows one to add diethylamine and obtain previously unknown enamines.