N-Heterocyclic Carbene Catalyzed Oxidative Macrolactonization: Total Synthesis of (+)-Dactylolide
作者:Kiyoun Lee、Hyoungsu Kim、Jiyong Hong
DOI:10.1002/anie.201201653
日期:2012.6.4
steps constitute the total synthesis of (+)‐dactylolide: the 1,6‐oxa conjugate addition reaction of a 2,4‐dienal for the facile synthesis of the 2,6‐cis‐2‐(4‐oxo‐2‐butenyl)tetrahydropyran subunit, the umpolung alkylation reaction of a cyanohydrin, and the NHC‐catalyzed oxidative macrolactonization reaction for the synthesis of the 20‐membered macrocyle. NHC=N‐heterocyclic carbene.
三个关键步骤构成了(+)-Dactylolide的总合成:2,4-二烯的1,6-Oxa共轭加成反应可轻松合成2,6-顺式-2-(4-氧代-2) -丁烯基)四氢吡喃亚基,氰醇的umpolung烷基化反应,以及NHC催化的氧化大内酯化反应,以合成20元大环。NHC = N-杂环卡宾。