Synthesis of (-)-swainsonine and (-)-8-epi-swainsonine from (S)- and (R)-glutamic acid derivatives.
作者:Nobuo IKOTA、Akira HANAKI
DOI:10.1248/cpb.38.2712
日期:——
(-)-Swainsonine (1) and (-)-8-epi-swainsonine were synthesized from (S)- and (R)-glutamic acid derivatives. (2R, 3S, 4R)-3, 4-Dihydroxy-2-hydroxymethylpyrolidine derivatives (9a and 9b) were prepared by cis-dihydroxylation of α, β-unsaturated compounds 6, 10 and 15 with OsO4 as the key reaction. The diastereoselective allylation of the aldehydes 18 derived from 9a and 9g, followed by cyclization, gave 1 and (-)-8-epi-swainsonine.
(-)-苦马豆素 (1) 和 (-)-8-表-苦马豆素由 (S)- 和 (R)- 谷氨酸衍生物合成。以OsO4为关键反应,通过α,β-不饱和化合物6、10和15的顺式二羟基化反应制备(2R,3S,4R)-3,4-二羟基-2-羟甲基吡咯烷衍生物(9a和9b)。衍生自9a和9g的醛18的非对映选择性烯丙基化,随后环化,得到1和(-)-8-表-苦豆素。