Diastereoselective synthesis of new polyhydroxylated indolizidines from (l)-glutamic acid
作者:Katarína Kadlečíková、Vincent Dalla、Štefan Marchalín、Bernard Decroix、Peter Baran
DOI:10.1016/j.tet.2005.03.029
日期:2005.5
tricyclic indolizidine dione 5, readily available in three steps from the cheap l-glutamic acid, as an attractive platform for chemo- and stereodivergent transformations is illustrated. The key steps involved totally diastereoselective ketone reduction of compound 5 and catalytic cis-dihydroxylation of the unsaturated amide 10. The synthetic strategy also allowed for the diastereoselective synthesis of benzoanalogues
非对映选择性合成两个新的swainsonine类似物1a和1b,哌啶环在C6-C7处与苯基核稠合,即(1 R,2 S,10 R,10a R)-(+)-1,2,10-三羟基-1,2,3,5,10,10a-六氢苯并[ f ]吲哚嗪(1a)和(1 S,2 R,10 R,10a R)-(+)-1,2,10-三羟基-1 ,2,3,5,10,10A六氢苯并[ ˚F ]中氮茚(1B),进行说明。在整个工作过程中,三环吲哚并立二酮5的有效性可以从廉价的L-谷氨酸分三步轻松获得,作为化学和立体发散转化的有吸引力的平台。关键步骤涉及化合物5的完全非对映选择性酮还原和不饱和酰胺10的催化顺式-二羟基化反应。合成策略还允许非对映选择性合成1,8a-二-表位-lentiginosine 3a((1 R,2 S,10a R)-(+)-1,2-dihydroxy-1,2,3的苯并类似物,5、10、10a-六氢苯并[ f