One-Pot Formation of Piperidine- and Pyrrolidine-Substituted Pyridinium Salts via Addition of 5-Alkylaminopenta-2,4-dienals to <i>N</i>-Acyliminium Ions: Application to the Synthesis of (±)-Nicotine and Analogs
作者:Sabrina Peixoto、Tuan Minh Nguyen、David Crich、Bernard Delpech、Christian Marazano
DOI:10.1021/ol101783c
日期:2010.11.5
triflate, followed by dehydrative cyclization, allowed the formation of pyridinium salts substituted at their 3-position by a five- or six-membered nitrogen heterocycle. Subsequent N-dealkylation of the pyridinium moiety and deprotection of the secondary amine or reduction of the carbamate function led to (±)-nicotine and analogs.
在三氟甲磺酸锌存在下,将由吡咯烷或哌啶衍生的α-羟基氨基甲酸酯原位生成的5-烷基氨基戊-2,4-二烯丙基加到N-酰基亚胺离子上,然后进行脱水环化,形成吡啶鎓取代的盐它们的3位是由五元或六元氮杂环形成的。吡啶部分的随后N-脱烷基化和仲胺的脱保护或氨基甲酸酯功能的降低导致(±)-烟碱和类似物。