Totalsynthesis of HirsutelloneB has been achieved by a convergent synthetic strategy. This synthesis features direct construction of the highly strained 13-membered macrocycle of HirsutelloneB utilizing the Ullmann-type reaction. To the best of our knowledge, this is the first application of macrocyclization utilizing an intramolecular Ullmann-type reaction between an aliphatic alcohol and aryl
The convergent totalsynthesis of two marine natural products, attenols A and B is achieved with excellent stereocontrol. The synthetic route is based on an enantio- and regioselective Sharpless dihydroxylation, palladium(0)-catalyzed reduction to form δ-hydroxy-1-enoates, stereoselective mCPBA-mediated epoxidation, and Julia–Kocienski olefination.
通过出色的立体控制实现了两种海洋天然产物 attenols A 和 B 的收敛全合成。合成路线基于对映选择性和区域选择性 Sharpless 二羟基化、钯 (0) 催化还原形成 δ-羟基-1-烯酸酯、立体选择性 mCPBA 介导的环氧化和 Julia-Kocienski 烯化。
Enantioselective Hydroformylation of 1-Alkenes with Commercial Ph-BPE Ligand
作者:Zhiyong Yu、Meredith S. Eno、Alexandra H. Annis、James P. Morken
DOI:10.1021/acs.orglett.5b01421
日期:2015.7.2
A rhodium complex, in conjunction with commercially available Ph-BPE ligand, catalyzes the branch-selective asymmetric hydroformylation of 1-alkenes and rapidly generates alpha-chiral aldehydes. A wide range of terminal olefins Including 1-dodecene were examined, and all delivered high enantioselectivity (up to 98:2 er) as well as good branch:linear ratios (up to 15:1).