A generalstrategy for the synthesis of 3,4-dioxygenated quinolin-2-one naturalproducts is reported. The key step is a regioselective insertion of arynes into unsymmetric imides. When performed in continuousflow, the reaction proceeds within minutes, while lower yields and longer reaction times are observed in batch. The resulting N-acylated 2-aminobenzophenones were transformed to (±)-peniprequinolone
Tandem Prenyltransferases Catalyze Isoprenoid Elongation and Complexity Generation in Biosynthesis of Quinolone Alkaloids
作者:Yi Zou、Zhajun Zhan、Dehai Li、Mancheng Tang、Ralph A. Cacho、Kenji Watanabe、Yi Tang
DOI:10.1021/jacs.5b03022
日期:2015.4.22
alkaloids that contain a highly modified 10-carbon prenyl group. Here we reveal an iterative prenylation mechanism for installing the 10-carbon unit using two aromatic prenyltransferases (PenI and PenG) present in the gene cluster of 1 from Penicillium thymicola. The initial Friedel-Crafts alkylation is catalyzed by PenI to yield dimethylallyl quinolone 6. The five-carbon side chain is then dehydrogenated