manner (trans) and in a stereospecific manner (inversion of configuration at the chiral center). Various functionalities could be introduced at the α-position of the newly formed cyclopropane ring by treating the cyclization mixture with hetero as well as carbon nucleophiles. Alternatively, treatment of the reaction mixture with triethylamine effects the clean elimination of a triflic acid to give
A Systematic Study of the Hydride Reduction of Cyclopropyl Ketones with Structurally Simplified Substrates. Highly Stereoselective Reductions of <i>Trans</i>-Substituted Cyclopropyl Ketones via the Bisected <i>s</i>-<i>Cis</i> Conformation
stereoselective hydride reduction of the cis- and trans-substituted cyclopropylketones was systematically investigated using a series of structurally simplified substrates, trans-[tert-butyldiphenylsilyloxymethyl]cyclopropylketones 1a-e and trans-(benzyloxymethyl)cyclopropylmethylketone (2), and the corresponding cis congeners 3a,b,e and 4. The results showed that, not only in the reduction of the cis-substituted