Cyclopropanation method

A cyclopropanation method, comprising:

• reacting an alcohol, an ester, or an aldehyde with a phenyl sulfone in an organic solvent containing a base providing a counter cation to form a cyclopropane;
• and,
• isolating the cyclopropane;
• wherein,
• the aldehyde is paraformaldehyde or R3CHO, in which R3 is hydrogen, alkyl, or cycloalkyl, and the alkyl is optionally intervened by oxygen, sulfur, or nitrogen;
• R3 is saturated or unsaturated, provided that a double bond does not exist between a β carbon and a γ carbon of the aldehyde;
• R3 is unsubstituted or substituted with at least one substituent selected from the group consisting of alkyl, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl, provided that the α carbon of the alcohol is unsubstituted;
• the substituent is further substituted or unsubstituted when the aldehyde is reacted;
• and,
• the organic solvent further contains a catalyst having an alcohol dehydrogenation activity when the alcohol or the ester is reacted.