Insertion reactions of donor/donor carbenes have emerged from obscurity to become
a versatile method for the synthesis of a variety of cyclic structures with excellent
control of diastereo- and enantioselectivity. This Account describes the origin of
this project as part of a natural product synthesis and the ensuing decade of reaction
development that has resulted in new asymmetric methods as well as intriguing tangential
observations.
Key words
C–H insertion - carbenes - rhodium - asymmetric catalysis