Reactions of ketene acetals-14 The use of simple mixed vinylketene acetals in the annulation of quinones
作者:Jacques Savard、Paul Brassard
DOI:10.1016/s0040-4020(01)91496-6
日期:1984.1
α,β- β, γ-unsaturated esters can be converted by strong base and chlorotrimethylsilane to the corresponding mixed vinylketene acetals which are shown to be particularly useful and generally applicable reagents for the regiospecific annulation of halogenoquinones. The reaction proceeds readily with a variety of substrates including benzoquinones.
λ3-Iodane-mediated arenol dearomatization. Synthesis of five-membered ring-containing analogues of the aquayamycin ABC tricyclic unit and novel access to the apoptosis inducer menadione
作者:Nathalie Lebrasseur、Gao-Jun Fan、Mayalen Oxoby、Matthew A. Looney、Stéphane Quideau
DOI:10.1016/j.tet.2004.11.072
日期:2005.2
rapid access to highly functionalized naphthoid cyclohexa-2,4-dienones. These synthons can serve as valuable intermediates in the construction of the angularly-oxygenated benz[a]naphthalene ABC ring system of aquayamycin- and SS-228Y-type antibiotic angucyclinones, and analogues thereof. This methodology led to the elaboration of five-membered A ring-containing analogues of this ABC tricyclic unit. In
的λ 3 -iodane [双(三氟乙酰氧基)]碘苯(BTI) -介导的氧化的2- alkoxyarenols与外部软碳系亲核试剂脱芳构化构成对高度功能化naphthoid环己-2,4-二烯酮一个快速访问。这些合成子可以用作水霉素和SS-228Y型抗生素环环素酮的角加氧苯并[ a ]萘ABC环体系及其类似物的构建中的有价值的中间体。这种方法学导致了该ABC三环单元的五元含A环类似物的阐述。此外,可以利用BTI介导的2-甲基萘酚的氧化活化来制备甲萘醌(即维生素K 3),已知可诱导细胞凋亡和自动分裂,这是一种新型的癌细胞死亡。
SAVARD, J.;BRASSARD, P., TETRAHEDRON, 1984, 40, N 18, 3455-3464