1. 2-(2-Methylcyclopropyl)furan and 2-(2-cyclopropylcyclopropyl)furan add to acrolein, crotonaldehyde, and mosityl oxide in an acid medium without cleavage of the cyclopropane ring with formation of the corresponding cyclopropylfuran aldehydes and ketones. 2. Aldehydes and ketones obtained in this way were subjected to Kizhner reduction with formation of 2-alkyl-5-(2-methylcyclopropyl)furans and 2-alkyl-5-(2-cyclopropylcyclopropyl)furans.