π-Allyl palladium approach toward the diazabicyclo[3.2.1]octane core of the naphthyridinomycin alkaloids
作者:Grace H.C. Woo、Se-Ho Kim、Peter Wipf
DOI:10.1016/j.tet.2006.06.114
日期:2006.11
A novel and efficient protocol for the synthesis of the 3,8-diazabicyclo[3.2.1]octane system found in the naphthyridinomycin, dnacin, and tetrazomine families of alkaloids is described. The key transformation involves an intramolecular palladium-catalyzed allylic alkylation. The cyclization proceeds smoothly under mild conditions (20 mol % Pd2dba3, 1.5 equiv DBU, 65 °C, THF, 20 min) to afford 3,8-diazabicyclo[3
描述了一种新颖有效的合成方案,用于合成在生物碱的萘啶霉素,藤黄素和四唑胺家族中发现的3,8-二氮杂双环[3.2.1]辛烷系统。关键的转化涉及分子内钯催化的烯丙基烷基化。环化顺利进行在温和条件下(20摩尔%的Pd 2 DBA 3,1.5当量DBU,65℃,THF,20 min),得到3,8-二氮杂双环[3.2.1]以优良产率辛烷(94-98% )。