Investigation of an Organomagnesium-Based [3 + 3] Annelation to Pyrans and Its Application in the Synthesis of Rhopaloic Acid A
摘要:
[GRAPHICS]A stepwise [3 + 3] annelation reaction has been developed that allows access to pyrans from epoxides. This process involves the addition of an allylmagnesium reagent, itself readily prepared from methallyl alcohol, and a Pd-catalyzed cyclodehydration reaction. The potential of this process to be employed in natural product synthesis has been exemplified by its use in the preparation of rhopaloic acid A.