Triisopropylsilyl enol ethers reaet with (TsN) 2Se to give α-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.
