反应详情

We found that both the yield and the enantioselectivity of the arylation of 2-methyl-α-tetralone could be brought to good levels by running the arylation using 10-20 mol % Pd(0)/12-24 mol % BINAP in toluene at 100° C.8,9 It was found that an excess of aryl bromide was necessary to ensure complete conversion of the ketone; 2-methyl-1-naphthol, biaryls, and compounds resulting from aldol condensation were formed as side-products. In some reactions, the α-phenylated ketone was also observed as a side product. Subsequent experiments demonstrated that the latter side product was a result of aryl transfer from the phosphine ligand.10 Using the conditions described above, the arylations of 2-methyl-α-tetralone proceeded with enantioselectivities up to 88% (Table 1).11 We have also briefly examined the reactions of 2-methyl-1-indanone, 1. Using 5 mol % Pd(OAc)2/12 mol % BINAP the reaction with

1. customyield
2. customat 100° C