Total synthesis of the beta-catenin inhibitor, (-)-agelastatin A: a second-generation approach based on radical aminobromination.

The second-generation approach to (-)-agelastatin A has been established. The present strategy features the FeBr(2)-mediated radical cyclization of 2-cyclopentenyloxycarbonyl azide that allows for the stereoselective installation of a cis-vicinal aminobromo functionality suitable for producing the BCD-ring system of agelastatin A. The aminobromination method streamlines access to oxazolidinone, a key intermediate in the previously reported synthesis, thereby culminating in the new total synthesis of (-)-agelastatin A.