Three-Carbon Ring Expansion by Cyclopropane Insertion: Macrocyclic Musks from Readily Available C-12 Starting Materials
作者:Georg Rüedi、Matthias Nagel、Hans-Jürgen Hansen
DOI:10.1021/ol0487027
日期:2004.8.1
A thermal three-carbon ringexpansion based on side chain ring insertion of a cyclopropane moiety is described. Flashvacuumpyrolysis (FVP) of 1-cyclopropyl-cycloalk-3-enol derivatives leads to the three-carbon ring expanded enones with clean retention of double bond geometry. Substrates bearing methyl groups on the cyclopropane ring undergo regioselective bond cleavage, allowing for the systematic