[C:1]([C:3]1([O:10][CH3:11])[CH2:8][CH2:7]N(C)[CH2:5][CH2:4]1)#[CH:2].[CH:12]1(N2CCC(C#C)(OC)CC2)CCCC1>>[C:1]([C:3]1([O:10][CH3:11])[CH2:8][CH2:7][CH2:12][CH2:5][CH2:4]1)#[CH:2]4-Ethynyl-4-methoxy-1-methyl-piperidine and 1-cyclopentyl-4-ethynyl-4-methoxy-piperidine may be prepared analogously.
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