Controlling Factors for C−H Functionalization versus Cyclopropanation of Dihydronaphthalenes
Etienne Nadeau
Dominic L. Ventura
Jonathan A. Brekan
Huw M. L. Davies
10.1021/jo902644f.s001
https://acs.figshare.com/articles/journal_contribution/Controlling_Factors_for_C_H_Functionalization_versus_Cyclopropanation_of_Dihydronaphthalenes/2783113
Rhodium(II)-catalyzed reactions of vinyldiazoacetates with dihydronaphthalenes were systematically studied. These substrates underwent cyclopropanantion and/or the combined C−H activation/Cope rearrangement in good overall yield and with good diastereo- and enantiocontrol. The selectivity of these reactions was profoundly influenced by the nature of the chiral catalyst, the vinyldiazoacetate, and the dihydronaphthalene. The best combinations for achieving the highest selectivity in the cyclopropanation and the combined C−H activation/Cope rearrangement of 1,2-dihydronaphthalenes are methyl 2-diazopent-3-enoate (<b>2a</b>)/Rh<sub>2</sub>(<i>S</i>-DOSP)<sub>4</sub> and methyl 3-(<i>tert</i>-butyldimethylsilyloxy)-2-diazopent-3-enoate (<b>2b</b>)/Rh<sub>2</sub>(<i>S</i>-PTAD)<sub>4</sub>. These combinations are very effective at enantiodivergent reactions of 1-methyl-1,2-dihydronaphthalenes.
2010-03-19 00:00:00
selectivity
methyl
Controlling Factors
chiral catalyst
dihydronaphthalene
combination
activation
vinyldiazoacetate
enantiodivergent reactions
rearrangement