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A novel rhodium-catalyzed conjugate addition of indium reagents to electron deficient olefins is reported. The reaction takes place in THF/MeOH at 110 °C using arylindium dichlorides, a rhodium(I)-binap complex as catalyst, and α,β-unsaturated ketones and lactones in good yields (45–94%). The addition of MeOH is crucial for an efficient transformation and NMR studies seem to indicate that promotes...
The synthesis of vitamin D 3 active metabolites [24R,25-(OH) 2 -D 3 , 24S,25-(OH) 2 -D 3 and 1α,24R,25-(OH) 3 -D 3 ] and the first 24-aminovitamin D 3 derivatives [24S-benzoylamino-25-OH-D 3 and 24S-benzoylamino-1α,25-(OH) 2 -D 3 ] are reported. The stereogenic center at C-24 was generated through ultrasonically...
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