Intramolecular Cyclization with Nitrenium Ions Generated by Treatment of <i>N</i>-Acylaminophthalimides with Hypervalent Iodine Compounds: Formation of Lactams and Spiro-Fused Lactams
作者:Yasuo Kikugawa、Akira Nagashima、Takeshi Sakamoto、Etsuko Miyazawa、Megumi Shiiya
DOI:10.1021/jo0347009
日期:2003.8.1
N-Phthalimido-N-acylnitrenium ions are generated from N-acylaminophthalimides, a new class of precursors, by treatment with hypervalent iodine compounds (PIFA and HTIB). In HFIP, the nitrenium ions undergo intramolecular electrophilic substitution reactions to afford N-aminonitrogen heterocycles in high yields. In TFEA, spirodienones bearing the 1-azaspiro[4.5]decane skeleton are obtained by treatment
N-邻苯二甲酰亚胺基-N-酰基氮化re离子是通过用高价碘化合物(PIFA和HTIB)处理从新型的前体N-酰基氨基邻苯二甲酰亚胺生成的。在HFIP中,,离子经历分子内亲电取代反应,以高收率提供N-氨基氮杂环。在TFEA中,由于中间nitr离子的ipso攻击,通过用HTIB处理N-邻苯二甲酰亚胺-3-(4-卤代苯基)丙酰胺获得了带有1-azaspiro [4.5]癸烷骨架的螺二烯酮。同样,在TFEA中使用PIFA,会发生未活化的苯类化合物化合物的ipso环化反应,得到螺二烯衍生物。尽管在苯基上没有其他活化取代基,但是这涉及芳香性的损失。