Construction of the basic skeleton of ophiobolin A and variecolin
作者:Ke Li、Cheng Wang、Gang Yin、Shuanhu Gao
DOI:10.1039/c3ob41693c
日期:——
Ophiobolin and variecolin type sesterterpenoids belong to cyclooctane-containing natural products. Both sesterterpenoids have challenging structures and appealing biological activities. We envisioned that a key tandem ring closing metathesis of dienynes could provide the basic skeleton of ophiobolin A and variecolin. We report herein the detailed reactivities of the dienynes which furnished the 5-8-5
Synthesis and Applications of Hajos-Parrish Ketone Isomers
作者:James M. Eagan、Masahiro Hori、Jianbin Wu、Kyalo Stephen Kanyiva、Scott A. Snyder
DOI:10.1002/anie.201500925
日期:2015.6.26
natural products possess ring systems and functionality for which Hajos–Parrishketoneisomers with a transposed methyl group (termed “iso‐Hajos–Parrishketones”) would be of value. However, such building blocks have not been exploited to the same degree as the more typical Hajos–Parrish hydrindane. An efficient three‐step synthesis of such materials was fueled by a simple method for the rapid preparation