Convenient access to bis-indole alkaloids. Application to the synthesis of topsentins
作者:Sajal K. Mal、Luis Bohé、Saïd Achab
DOI:10.1016/j.tet.2008.04.045
日期:2008.6
Topsentins and related bis-indole alkaloids may be efficiently synthesized through an addition/oxidation sequence leading to 2-(3-indolylcarbonyl)-imidazole derivatives followed by a Pd-catalyzed heteroarylation with the appropriate 3-stannylindoles.
A three-component coupling approach to the marine bis-indole alkaloids: Topsentin, deoxytopsentin and bromotopsentin
作者:Saïd Achab
DOI:10.1016/0040-4039(96)01148-3
日期:1996.7
The total syntheses of three marinebis-indolealkaloids (1, 2, 4) of the topsentin family together with the synthesis of the unnatural deoxybromotopsentin (33) are described. Key elements include, a 1,2-addition-oxidation sequence to construct the bis-heteroarylketones (18, 19, 29, 30) and a Pd-catalyzed heteroarylation involving the 3-stannylindoles (12, 26)
The usefulness of 3-iodoindoles available for introduction of an indole unit is presented. The reaction of various halo-3-iodoindoles with 1,4-naphthoquinone gave the corresponding 2-(3-indolyl)-1-4,naphthoquinones in moderate yields. The 3-iodoindole was used for synthesis of a compound containing both naph-thazarin and indole skeletons.
Synthesis and biological evaluation of the ascidian blood-pigment halocyamine A
作者:Hugo K. H. Fong、Jean Michel Brunel、Arlette Longeon、Marie-Lise Bourguet-Kondracki、David Barker、Brent R. Copp
DOI:10.1039/c7ob01122a
日期:——
The first synthesis of the (Z)-indolic enamide-containing antibacterial marine natural product halocyamine A is reported.
报道了含有(Z)-吲哚烯酰胺的抗菌海洋天然产物halocyamine A的第一次合成。
Total Synthesis of Nortopsentin D via a Late-Stage Pinacol-like Rearrangement
作者:Katarina L. Keel、Jetze J. Tepe
DOI:10.1021/acs.orglett.1c01681
日期:2021.7.16
activity. Herein we describe the first totalsynthesis of nortopsentin D, in which amidine and dione undergo a pivotal condensation and subsequent cyclization via a pinacol-like rearrangement. This synthesis represents a unique strategy for the formation of 5,5-disubstituted (4H)-imidazol-4-one containing natural products, many of which have yet to succumb to totalsynthesis.
Nortopsentin D 是一类双(吲哚)生物碱的一部分,其生物活性包括对肿瘤细胞的抑制活性和抗真菌活性。在此,我们描述了nortopsentin D 的首次全合成,其中脒和二酮通过频哪醇样重排进行关键的缩合和随后的环化。这种合成代表了形成含有 5,5-二取代 (4 H )-咪唑-4-one 的天然产物的独特策略,其中许多尚未完全合成。