Enantioselective
Insertion of a Carbenoid Carbon into
a C–C Bond To Expand Cyclobutanols to Cyclopentanols
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Abstract
When
a carbenoid species generated from a tosylhydrazone is reacted
with a cyclobutanol in the presence of a chiral rhodium catalyst,
a C–C single bond of the cyclobutanol is cleaved, and the carbenoid
carbon is inserted therein to furnish a ring-expanded cyclopentanol
in an enantioselective manner