Studies Directed Toward the Synthesis of Taxanes: Evaluation of the B-Ring Formation By an Intramolecular Nitrile Oxide Cycloaddition
作者:Alex Nivlet、Luc Dechoux、Jean-Philippe Martel、Gottfried Proess、Dietrich Mannes、Lilian Alcaraz、Jerry J. Harnett、Thierry Le Gall、Charles Mioskowski
DOI:10.1002/(sici)1099-0690(199912)1999:12<3241::aid-ejoc3241>3.0.co;2-9
日期:1999.12
intramolecular nitrile oxide [3+2] cycloaddition were prepared from the monoacetal of 2,2-dimethylcyclohexane-1,3-dione (5). The nitrile oxides were then generated under high-dilution conditions. In most cases only oligomers were obtained. The isoxazoline 19, containing a 9-membered ring, was formed from the nitrile oxide 17, and a bis(isoxazoline) 21was isolated from the reaction of the nitro compound 16c.
由 2,2-二甲基环己烷-1,3-二酮 (5) 的单缩醛制备了通过分子内氧化腈 [3+2] 环加成形成紫杉烷 8 元 B 环的几种模型。然后在高稀释条件下生成腈氧化物。在大多数情况下,仅获得低聚物。含有9元环的异恶唑啉19由腈氧化物17形成,并且双(异恶唑啉)21从硝基化合物16c的反应中分离。