A Direct Route to Fluostatin C by a Fascinating Diels−Alder Reaction
作者:Maolin Yu、Samuel J. Danishefsky
DOI:10.1021/ja7113757
日期:2008.3.1
The Diels-Alderreactions between vinylindenes (5 or 6) as the dienes with quinoneketals (7 or 8) or with methacrolein as the dienophiles were investigated. The remarkable regioselectivities of these Diels-Alder adducts suggested that the regiopreferences of these dienes and dienophiles in these cases are not a fixed property of each component of the cycloaddition but are mutually contigent. This paper
研究了作为二烯的乙烯基茚(5 或 6)与醌缩酮(7 或 8)或甲基丙烯醛作为亲二烯体之间的 Diels-Alder 反应。这些 Diels-Alder 加合物的显着区域选择性表明,在这些情况下,这些二烯和亲二烯体的区域偏好不是环加成的每个组分的固定特性,而是相互并存的。本文展示了如何将 6 和 8 之间的 Diels-Alder 反应应用于氟他汀 C 和 E 的首次全合成。
Photochemical rearrangements of quinone monoketals. Synthesis of substituted cyclopentenones
作者:Michael C. Pirrung、David S. Nunn
DOI:10.1016/s0040-4039(00)80042-8
日期:1988.1
The irradiation of quinone ethylene monoketals in acetic acid leads in high yield to substituted 4-(alkoxycarbonyl) cyclopentenones.
苯醌乙烯单缩酮在乙酸中的照射导致高产率生成取代的4-(烷氧羰基)环戊烯酮。
Synthesis of isoxazoles en route to semi-aromatized polyketides: dehydrogenation of benzonitrile oxide–para-quinone acetal cycloadducts
A variety of highly functionalized polycyclic isoxazoles are prepared by a two-step protocol: (1) 1,3-dipolar cycloaddition of o,oâ²-disubstituted benzonitrile oxides to para-quinone mono-acetals, then (2) dehydrogenation. The cycloaddition proceeds in a regioselective manner, favouring the formation of the 4-acyl cycloadducts, which are suitable intermediates for the synthesis of semi-aromatized polycyclic targets derived from polyketide type-II biosynthesis.
我们采用两步法制备了多种高度官能化的多环异噁唑:(1) o,oâ²-二取代苯腈氧化物与对苯醌单乙醛的 1,3-二极环化反应,然后 (2) 脱氢反应。该环化反应以区域选择性的方式进行,有利于形成 4-酰基环化产物,这些环化产物是合成来自多酮 II 型生物合成的半芳香化多环目标物的合适中间体。
Catalytic Enantioselective Diels−Alder Reactions of 1,4-Quinone Monoketals
作者:Matthias Breuning、E. J. Corey
DOI:10.1021/ol015852y
日期:2001.5.1
Achiral 1,4-quinone monoketals function well as dienophiles in enantioselectiveDiels−Alderreactions catalyzed by a chiral Ti(IV) Lewis acid.
在由手性 Ti(IV) Lewis 酸催化的对映选择性 Diels-Alder 反应中,非手性 1,4-醌单缩酮的作用很好。
PIRRUNG, MICHAEL C.;NUNN, DAVID S., TETRAHEDRON LETT., 29,(1988) N 2, 163-166