Lancilactone C 是一种三环三萜类化合物,可抑制 H9 淋巴细胞中人类免疫缺陷病毒 (HIV) 的复制,且无细胞毒性。其三环骨架由反式-二甲基双环[4.3.0]壬烷和7-异丙烯环庚-1,3,5-三烯组成。后者独特的结构,即所有碳原子都是sp2杂化,是其他三萜类化合物中没有发现的,需要合成验证。在此,我们通过开发一种新的多米诺骨牌[4 + 3]环加成反应,包括氧化、Diels-Alder反应、消除和电环化,首次全合成了lancilactone C(拟定结构)。我们还根据兰西内酯 C 的合理生物合成途径,在其全合成的基础上修改了结构。
Synthesis and biological evaluation of a new triazole–oxotechnetium complex
作者:Olivier Martinage、Loïc Le Clainche、Bertrand Czarny、Christophe Dugave
DOI:10.1039/c2ob25774b
日期:——
A new triazole oxotechnetium chelating agent was synthesized via a âClick-to-Chelateâ strategy. In vivo evaluation of the corresponding 99mTc complex shows that the tracer exhibits very interesting properties for molecular imaging.
Cyclotrimerization Strategy toward Analogues of Amaryllidaceae Constituents. Synthesis of Deoxygenated Pancratistatin Core
作者:Michael Moser、Xuetong Sun、Tomas Hudlicky
DOI:10.1021/ol052372o
日期:2005.12.1
[chemical reaction: see text]. A derivative of pancratistatin having no oxygenation in the aromatic ring was synthesized by a new strategy based on the cobalt-catalyzed cyclotrimerization of acetylenes as a prelude to diversity-oriented synthesis of further analogues.
Cyclotrimerization approach to unnatural structural modifications of pancratistatin and other amaryllidaceae constituents — Synthesis and biological evaluation
作者:Tomas Hudlicky、Michael Moser、Scott C Banfield、Uwe Rinner、Jean-Charles Chapuis、George R Pettit
DOI:10.1139/v06-078
日期:2006.10.1
The phenanthridone core of pancratistatin lacking all aromatic oxygenation was prepared by cyclotrimerization of acetylene-containing scaffolds 30 and 41, reflecting the natural and the C-1 epi configuration, re- spectively, of the amino inositol moiety. The cobalt-catalyzed formation of the aromatic core led to bisTMS derivatives 39 and 48, as well as bisacetyl derivative 51. The effectiveness of
Synthesis, and Cyclization to Aurones and Flavones, of Alkoxy-Substituted Aryl, Arylalkynyl Ketones
作者:Penelope J. Kerr、Simon M. Pyke、A. David Ward
DOI:10.1071/ch07348
日期:——
corresponding aryl alkoxylarylalkynyl ketones in which one of the benzyl groups has been removed. Cyclization of these phenolic ketones using basic reagents (potassium carbonate in acetone is best) provides the corresponding aurone system. When the phenolic group of the alkynyl ketones is protected as the t-butyldimethylsilyl ether followed by cyclization, using 18-crown-6 and potassium fluoride, mixtures