Triisopropylsilyl enol ethers reaet with (TsN)2Se to give a-N-tosylamino derivatives in modest to good yields. In the absence of 1,3-diaxial interactions the N-tosylamino group prefers an axial conformation. The axial N-tosylamino derivatives can be readily transformed into the azabicyclo[3.3.1]nonane skeleton, the core structure of a number of alkaloids.