Total Synthesis of Marine Natural Products (+)-Strongylin A and Corallidictyal D by Regio- and Stereoselective Cyclization of Alkenyl Benzenes
作者:Yun-Fei Cheng、Hui-Jing Li、Yan-Chao Wu
DOI:10.1021/acs.joc.2c02440
日期:2022.12.16
selectivity-controlled cyclization in the presence of HCl and BF3·Et2O affords benzofuran III and benzopyran IV, respectively. The applicability of this HCl-induced cyclization is showcased by a regio- and stereoselective synthesis of corallidictyal D, while BF3·Et2O-promoted cyclization posterior to rearrangement of an alkenyl benzene provides a regioselectively different benzopyran, (+)-strongylin A.
描述了一种快速获取海洋天然产物 (+)-strongylin A 和 corallidictyal D 的方法。TFA/Et 3 SiH 诱导的烯醇I还原异构化为烯基苯II,然后在 HCl 和 BF 3 ·Et 2 O存在下进行选择性控制环化,分别得到苯并呋喃III和苯并吡喃IV。这种 HCl 诱导的环化的适用性通过区域选择性和立体选择性合成 corallidictyal D 展示,而 BF 3 ·Et 2 O 促进的环化在烯基苯重排之后提供了区域选择性不同的苯并吡喃,(+)-strongylin A .
Total Synthesis of (+)-Strongylin A, a Rearranged Sesquiterpenoid Hydroquinone from a Marine Sponge
作者:Takaaki Kamishima、Takuya Kikuchi、Tadashi Katoh
DOI:10.1002/ejoc.201300438
日期:2013.7
trans-decalone derivative (19 % overall yield in 11 steps). The synthetic method involved the following key steps: (i) stereocontrolled hydrogenation of an exo-olefinic decalin to install the C8 stereogenic centre present in the required decalin segment; (ii) coupling of the decalin segment with an aromatic moiety to assemble the desired carbon skeleton; and (iii) sequential BF3·Et2O-induced dehydroxylation/re