Intermolecular C-H insertion with rhodium carbenoid intermediates is a very
promising method for C-H activation. By using carbenoids derived from viny
l and phenyl diazoacetates, highly selective C-H insertions can be achieved
. High asymmetric induction is obtained when dirhodium tetraprolinates (24-
27) are used as catalysts. Remarkably, with certain substrates, excellent d
iastereocontrol is also possible. (C) 2001 Elsevier Science B.V. All rights
reserved.