Generation of a Lewis acid activated formaldimine and its reaction with enol silyl ethers. N-Unsubstituted aminomethylation
摘要:
N-(Trimethylsilyl)formaldimine-AlCl3 complex 2b was generated by treating (trimethylsilyl)methyl azide with AlCl3. The reaction of 2b with various kinds of enol triisopropylsilyl ethers afforded alpha'-aminomethylated enol silyl ethers in good yields.
N-(Trimethylsilyl)formaldimine-AlCl3 complex 2b was generated by treating (trimethylsilyl)methyl azide with AlCl3. The reaction of 2b with various kinds of enol triisopropylsilyl ethers afforded alpha'-aminomethylated enol silyl ethers in good yields.
Construction of N-Acylated 4-Piperidones via Selective Carbon-Nitrogen and Carbon-Carbon Bond Formation
作者:Mitsumasa Takahashi、Keiji Tanino、Isao Kuwajima
DOI:10.1246/cl.1993.1655
日期:1993.10
N-Acylated 4-piperidone was prepared in good overall yield through an initial formation of the imine from the reaction of α′-aminomethylated enol silyl ether with an aldehyde followed by cyclization effected with an acid anhydride. The latter cyclization reaction seems to proceed preferentially through a boat-like transition state to give the piperidone having exo substituent.