分子内电芳族取代(S Ë在异恶唑的5位上的Ar)反应来实现。异恶唑4位上的供电子杂原子(N和O)可以根据我们最初开发的合成方法轻松制备,阳离子金(I)催化剂对于分子内S E Ar反应的合成至关重要含异恶唑的稠合杂环。结构良好的高收率合成了结构多样的异恶唑烷吡啶6和异恶唑并吡喃9,包括对碱不稳定的3-未取代的衍生物。N的加法-苯基苯扎二胺作为氢受体可提高异恶唑烷吡啶的合成产率。此外,四环稠环系统12的合成是通过串联二环化从相应的二炔11实现的。
Iodocyclization of Hydroxylamine Derivatives Based on the Control of Oxidative Aromatization Leading to 2,5-Dihydroisoxazoles and Isoxazoles
作者:Takashi Okitsu、Kana Sato、Taterao M. Potewar、Akimori Wada
DOI:10.1021/jo200407b
日期:2011.5.6
An efficient method for the synthesis of 2,5-dihydroisoxazoles and isoxazoles using iodocyclization of N-alkoxycarbonyl O-propargylic hydroxylamines has been developed. 2,5-Dihydro-4-iodoisoxazole underwent the cross-coupling reactions without aromatization to afford polyfunctionalized 2,5-dihydroisoxazoles. This process was applied to the preparation of valdecoxib and its 2,5-dihydro-derivative.
WO2024054832A1
申请人:——
公开号:——
公开(公告)日:——
Gold(I)-Catalyzed Intramolecular S<sub>E</sub>Ar Reaction: Efficient Synthesis of Isoxazole-Containing Fused Heterocycles
heterocycles. Structurally diverse isoxazolopyridines 6 and isoxazolopyrans 9, including base-labile 3-unsubstituted derivatives, were synthesized in good to high yields. The addition of N-phenylbenzaldimine as a hydrogen acceptor improved yields in the synthesis of isoxazolopyridines. Furthermore, synthesis of the tetracyclic fused ring system 12 was achieved by tandem cyclization from the corresponding
分子内电芳族取代(S Ë在异恶唑的5位上的Ar)反应来实现。异恶唑4位上的供电子杂原子(N和O)可以根据我们最初开发的合成方法轻松制备,阳离子金(I)催化剂对于分子内S E Ar反应的合成至关重要含异恶唑的稠合杂环。结构良好的高收率合成了结构多样的异恶唑烷吡啶6和异恶唑并吡喃9,包括对碱不稳定的3-未取代的衍生物。N的加法-苯基苯扎二胺作为氢受体可提高异恶唑烷吡啶的合成产率。此外,四环稠环系统12的合成是通过串联二环化从相应的二炔11实现的。
Generation of an 4-Isoxazolyl Anion Species: Facile Access to Multifunctionalized Isoxazoles
作者:Taiki Morita、Shinichiro Fuse、Hiroyuki Nakamura
DOI:10.1002/anie.201608039
日期:2016.10.17
A direct functionalization of unsubstituted isoxazole (1) was achieved by generation of 4‐isoxazolyl anion species (3). An efficient 4‐iodination of isoxazole and halogen–metal exchange reaction using a turbo Grignard reagent (iPrMgCl⋅ LiCl) were essential for the generation of 3, which reacted with various electrophiles to give 4‐functionalized isoxazoles in good to high yields. Isoxazolyl boronate