Synthesis of Substituted Phenols by Using the Ring-Closing Metathesis/Isoaromatization Approach
作者:Kazuhiro Yoshida、Rintaro Narui、Tsuneo Imamoto
DOI:10.1002/chem.200800943
日期:2008.10.29
Ring-closing olefin metathesis (RCM) of 4-methylene-1,7-octadien-3-ones 2, followed by isomerization of the carbon--carbon double bond of 6-methylene-2-cyclohexenones 3 from exo to endo, produced various phenols 4. As an application of the method, the RCM/Mizoroki-Heck reaction of 2 was proven to be also effective for the synthesis of phenols having an additional substituent at ortho-benzylic position
An electroreductive cross-electrophile coupling protocol was developed for the construction of valuable 1,3-dienes from vinyl bromides. Furthermore, this scalable method can also be used to forge complex [4 + 2] cycloadducts in a one-pot manner. One of the most important advantages of this green and sustainable protocol is the in situ release of nickel catalyst from the inexpensive electrodes without