Investigations on intramolecular 1,3-dipolar cycloadditions for the synthesis of isoxazolo-annulated pyrrolidines, piperidines and azepanes
作者:Martina Würdemann、Jens Christoffers
DOI:10.1016/j.tet.2014.05.042
日期:2014.8
Pyrrolidines, piperidines, and azepanes with annulated isoxazole, isoxazoline or isoxazolidine rings were prepared by intramolecular 1,3-dipolar cycloadditions of nitrones or nitrile oxides. The corresponding 1,3-dipoles were obtained from N-Boc-protected and N-allyl-, N-propargyl- or N-(3-butenyl)-substituted 2-aminoethanal or 3-aminopropanal.
吡咯烷,哌啶和氮杂环戊烷与异恶唑环,异恶唑啉环或异恶唑烷环是通过分子内的1,3-偶极亚硝基环或腈氧化物加成制备的。相应的1,3-偶极是从N -Boc保护的和N-烯丙基-,N-炔丙基-或N-(3-丁烯基)取代的2-氨基乙醛或3-氨基丙醛获得的。