作者:James H. Rigby、Alexandre Cavezza、Mary Jane Heeg
DOI:10.1021/ja974317j
日期:1998.4.1
The total synthesis of (±)-tazettine (1) has been achieved in 16 steps from commercially available piperonyl alcohol in 11% overall yield. The crucial quaternary center was assembled by a novel [4+1] cycloaddition between dimethoxycarbene and β-aryl vinyl isocyanate (4). Samarium diiodide conditions were employed to reduce the enamide unsaturation in the [2]benzopyrano[3,4-c]hydroindole intermediate
(±)-tazettine (1) 的全合成已通过 16 个步骤从市售胡椒醇中实现,总产率为 11%。关键的四元中心是通过二甲氧基卡宾和 β-芳基乙烯基异氰酸酯之间的新型 [4+1] 环加成组装而成的 (4)。使用二碘化钐条件来减少 [2] 苯并吡喃并 [3,4-c] 氢吲哚中间体 19 中的烯酰胺不饱和度,生成显示顺式-AB 环融合的化合物 20。