Rhodium-Catalyzed, Enantioselective Hydroacylation of ortho-Allylbenzaldehydes
The development of a rhodium catalyst for endo- and enantioselective hydroacylation ofortho-allylbenzaldehydes is reported. A catalyst generated in situ from [Rh(COD)Cl]2, (R)-DTBM-SEGPHOS, and NaBARF promotes the desired hydroacylation reactions and minimizes the formation of byproducts from competitive alkene isomerization and ene/dehydration pathways. These rhodium-catalyzed processes generate the 3,4-dihydronaphthalen-1(2H)-one products in moderate-to-high yields (49–91%) with excellent enantioselectivities (96–99% ee).
Reprinted (adapted) with permission from Organic Letters 17 (2015): 4654, doi:10.1021/acs.orglett.5b02559. Copyright 2015 American Chemical Society.