4-diarylpyrrole-2,5-dicarboxylic acids was used for an efficient synthesis ofpolycitrin A (4). Investigation of the bromine-mediated degradation of acid 2b to maleimide 3b suggested that 2,5-dibromopyrrole (5) and 5,5-dimethoxy-3-pyrroline-2-one (6) are intermediates in this process. The debromo analogue of polycitone A (10) was prepared in two steps from pyrrole dicarboxylic acid diester 7.
Metal Complexes of Biologically Important Ligands, CLXXI [1]. Incorporation of the cis-Dichloroplatinum Group into Amides of 3,4-Diarylpyrrole-2,5-dicarboxylic Acids
5-dicarboxylic acids were coupled with rac-N1,N2-di-Boc-1,2,4-triaminobutane to give the corresponding diamides, which were deprotected and converted into the bis(cis-dichloroplatinum) complexes by treatment with K2PtCl4 Graphical Abstract Metal Complexes of Biologically Important Ligands, CLXXI [1]. Incorporation of the cis-Dichloroplatinum Group into Amides of 3,4-Diarylpyrrole-2,5-dicarboxylic Acids
Total Syntheses of the Structures Assigned to Denigrins A, B, C, F, and G, 3,4-Diaryl-Pyrrole and -Pyrrolidinone Alkaloids, and the Conversion of Congener B into the Co-metabolite Spirodactylone
作者:Liangguang Yi、Shen Tan、Lorenzo V. White、Min-Yi Liang、Martin G. Banwell
DOI:10.1021/acs.jnatprod.3c01177
日期:2024.6.28
The title marine natural products have been prepared by totalsynthesis and in the case of congeners 3, 6, and 7 for the first time. Each of these was obtained by manipulation of readily prepared denigrin B (2). The structure, 3, assigned to denigrin C is shown to be incorrect. Reaction of compound 2 with DDQ has led, in high yield, to the related natural product spirodactylone (16), while treating
标题海洋天然产物是通过全合成方法制备的,同系物3、6和7是首次制备。这些都是通过操作容易制备的 denigrin B ( 2 ) 获得的。分配给 denigrin C 的结构3被证明是不正确的。化合物2与DDQ的反应以高产率产生相关的天然产物螺缩酮( 16 ),同时用PIFA/BF 3 ·Et 2 O处理相应的全甲基醚15 ,得到具有异构骨架的化合物20 。