Synthesis of 5-alkylidene-2,5-dihydropyrrol-2-ones based on cyclizations of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with oxalyl chloride
作者:Christian Haase、Peter Langer
DOI:10.1016/j.tet.2009.03.102
日期:2009.6
The acid-mediated reaction of amines with γ-alkylidenebutenolides, readily available by cyclization of 1,3-bis(silyloxy)-1,3-butadienes with oxalylchloride, allows a convenient synthesis of a variety of 5-alkylidene-2,5-dihydropyrrol-2-ones. The configuration of the exocyclic double bond of the products depends on the substitution pattern of the products.
Convenient Preparation of 5-Alkylidene-2,5-dihydropyrrol-2-ones by Ring-Transformations of γ-Alkylidenebutenolides: Formal Synthesis of Pukeleimide A
作者:Peter Langer、Christian Haase
DOI:10.1055/s-2005-862368
日期:——
The reaction of γ-alkylidenebutenolides, readily available by cyclization of 1,3-bis-silylenolethers with oxalyl chloride, with amines in glacial acetic acid allows a convenient synthesis of 5-alkylidene-2,5-dihydropyrrol-2-ones. This method was applied to a formal total synthesis of the natural product pukeleimide A.
γ-亚烷基丁烯内酯(可通过 1,3-双-甲硅烷基烯醇醚与草酰氯的环化容易获得)与胺在冰醋酸中的反应可以方便地合成 5-亚烷基-2,5-二氢吡咯-2-酮。将该方法应用于天然产物普克来亚胺 A 的正式全合成。
Defunctionalization of γ-Alkylidene-α-hydroxybutenolides by Palladium(0)-Catalyzed Reaction of Enol Triflates with Hexylboronic Acid