title: One-pot multiple reactions: asymmetric synthesis of 2,6-cis-disubstituted piperidine alkaloids from chiral aziridine.
abstract: A divergent, new, and highly stereoselective synthesis of cis-2,6-disubstituted piperidine natural products including isosolenopsins, deoxocassine, and spectaline was achieved from chiral aziridine decorated with appropriate alkyl chains for isosolenopsins or alkynyl groups for deoxocassine and spectaline at C2. The characteristic feature of this synthesis is one-pot sequential reactions under atmospheric hydrogen including the reduction of alkyne (for deoxocassine and spectaline), reductive ring-opening of aziridine, debenzylation, and intramolecular reductive amination in high yields. The prerequisite aziridines were elaborated from commercially available (2S)-hydroxymethylaziridine through oxidation, Wittig olefination, and the Grignard reaction for isosolenopsins or substrate-controlled lithium alkynylate addition for deoxocassine and spectaline.
authors.affiliation: Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 17035, Korea. hjha@hufs.ac.kr.
authors.forename: Nagendra Nath
authors.initials: NN
authors.lastname: Yadav
authors.affiliation: Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 17035, Korea. hjha@hufs.ac.kr.
authors.forename: Jihye
authors.initials: J
authors.lastname: Choi
authors.affiliation: Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 17035, Korea. hjha@hufs.ac.kr.
authors.forename: Hyun-Joon
authors.initials: HJ
authors.lastname: Ha
mesh_terms: D000470:Alkaloids / Q000138:chemical synthesis* / Q000737:chemistry*; D001388:Aziridines / Q000737:chemistry*; D060326:Chemistry Techniques, Synthetic; D007659:Ketones / Q000737:chemistry; D010880:Piperidines / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000470:Alkaloids; D001388:Aziridines; D007659:Ketones; D010880:Piperidines; C033132:aziridine; C032727:piperidine