Increasing Structural Diversity of Natural Products by Michael Addition with <i>ortho</i>-Quinone Methide as the Acceptor
作者:Ge Liao、Jie Fan、Lena Ludwig-Radtke、Katja Backhaus、Shu-Ming Li
DOI:10.1021/acs.joc.9b02971
日期:2020.1.17
form of clavatol, ortho-quinonemethide, can be generated from hydroxyclavatol in an aqueous system and used as a highly reactive intermediate for coupling with diverse natural products under very mild conditions. These include flavonoids, hydroxynaphthalenes, coumarins, xanthones, anthraquinones, phloroglucinols, phenolic acids, indole derivatives, tyrosine analogues, and quinolines. The clavatol moiety
Breaking Cyclic Dipeptide Prenyltransferase Regioselectivity by Unnatural Alkyl Donors
作者:Mike Liebhold、Xiulan Xie、Shu-Ming Li
DOI:10.1021/ol401247s
日期:2013.6.21
The behavior of five cyclic dipeptide prenyltransferases, responsible for C2-regular, C2-reverse, or C3-reverse prenylation, was investigated In the presence of the unnatural alkyl donors monomethylallyl and 2-pentenyl diphosphate. Both substrates were well accepted by the tested enzymes. Interestingly, C2-reverse and C3-reverse monoalkylated derivatives were identified as enzyme products In all of the enzyme assays. These findings indicate their similar reaction characteristics in the presence of unnatural alkyl donors.