Total synthesis of nonpeptidal cholecystokinin antagonists from Aspergillus alliaceus
作者:Mark G. Bock、Robert M. DiPardo、Steven M. Pitzenberger、Carl F. Homnick、James P. Springer、Roger M. Freidinger
DOI:10.1021/jo00384a062
日期:1987.4
Assembly of Asperlicin Peptidyl Alkaloids from Anthranilate and Tryptophan: A Two-Enzyme Pathway Generates Heptacyclic Scaffold Complexity in Asperlicin E
作者:Stuart W. Haynes、Xue Gao、Yi Tang、Christopher T. Walsh
DOI:10.1021/ja308371z
日期:2012.10.24
Members of the asperlicin family of fungal metabolites produced by Aspergillus alliaceus are known potent CCKA antagonists. Herein, we report the identification of the gene cluster responsible for directing their biosynthesis. We validate and probe the pathway by genetic manipulation, and provide the first biochemical characterization of the oxidative cyclization en route to the heptacyclic asperlicin E by reconstituting the activity of the FAD depend monooxygenase AspB. This report provides the first genetic characterization of a NRPS assembly line that efficiently activates two anthranilate building blocks and illustrates the remarkably efficient biosynthesis of the complex heptacyclic asperlicin E.
Procedure—economical enantioselective total syntheses of asperlicins C and E
作者:Pei-Qiang Huang、Yu Wang、Shi-Peng Luo、Hui Geng、Yuan-Ping Ruan、Ai-E Wang
DOI:10.1016/j.tetlet.2015.01.084
日期:2015.3
employment of LVT for the synthesis of asperlicin C, which allowed accessing asperlicin C in >99% enantioselectivity. Asperlicin C was converted, in one-pot, into asperlicin E and 2,3-di-epi-asperlicin E by dimethyl dioxirane (DMDO)-mediated tandem reactions. The use of DMDO as a green, cheap, and easily available oxidant to replace the photochemical method renders the synthesis of asperlicin E experimentally