Summary: A [3+ 31-type annelation between a, d-dimethoxylated amides 4 and allyltrimethylsilane (5) gave piperidine derivatives 6. It was applied to the synthesis of piperidine, indolizidine, quinolizidine, l-azabicyclo-[5.4. 0] undecane, l-aza-8-oxabicyclo [4.3. 0] nonane, 8-azabicyclo [3.2. 11 octane, and 9-azabicyclo [3.3. llnonane derivatives.