An Enantioselective Biomimetic Total Synthesis of (−)-Siccanin
作者:Barry M. Trost、Hong C. Shen、Jean-Philippe Surivet
DOI:10.1002/anie.200351868
日期:2003.8.25
Biomimetic Enantioselective Total Synthesis of (−)-Siccanin via the Pd-Catalyzed Asymmetric Allylic Alkylation (AAA) and Sequential Radical Cyclizations
作者:Barry M. Trost、Hong C. Shen、Jean-Philippe Surivet
DOI:10.1021/ja048084p
日期:2004.10.1
enantioselectively via a biomimetic route. This synthetic route features two sequential radical cyclizations: a Ti(III)-mediated radical cyclization of epoxyolefin 48 to construct the B-ring, and a Suarez reaction to establish the tetrahyrofuran ring. Chiral chroman moiety of siccanin was prepared based on our recent development of the Pd-catalyzed asymmetric allylic alkylation (AAA) of phenol trisubstituted
(-)-Siccanin (1) 是一种具有显着抗真菌特性的天然产物,通过仿生途径对映选择性合成。该合成路线具有两个连续的自由基环化:Ti(III) 介导的环氧烯烃 48 自由基环化以构建 B 环,以及苏亚雷斯反应以建立四氢呋喃环。基于我们最近开发的苯酚三取代烯丙基碳酸酯的 Pd 催化不对称烯丙基烷基化 (AAA),制备了 siccanin 的手性色满部分。还合成了 siccanochromene 家族的其他几个成员,包括 siccanochromenes A (2)、B (3)、E (6)、F (7) 和 siccanochromene C (55) 的甲基醚。这些研究可能会阐明这一新型化合物家族的生物合成。