N- to C-sulfonyl photoisomerisation of dihydropyridinones: a synthetic and mechanistic study
作者:Pei-Pei Yeh、James E. Taylor、Daniel G. Stark、David S. B. Daniels、Charlene Fallan、John C. Walton、Andrew D. Smith
DOI:10.1039/c7ob01699a
日期:——
The scope and limitations of a photoinitiated N- to C-sulfonyl migration process within a range of dihydropyridinones is assessed. This sulfonyl transfer proceeds without erosion of either diastereo- or enantiocontrol, and is general across a range of N-sulfonyl substituents (SO2R; R = Ph, 4-MeC6H4, 4-MeOC6H4, 4-NO2C6H4, Me, Et) as well as C(3)-(aryl, heteroaryl, alkyl and alkenyl) and C(4)-(aryl and
评估了在二氢吡啶酮类化合物中光引发的N-到C-磺酰基迁移过程的范围和局限性。此磺酰转让收益而无需任diastereo-或enantiocontrol的侵蚀,并在一系列的是一般ñ -磺酰基的取代基(SO 2 R等R = PH,4-MEC 6 ħ 4,4-MeOC 6 H ^ 4,4-NO 2 C 6 H 4,Me,Et)以及C(3)-(芳基,杂芳基,烷基和烯基)和C(4)-(芳基和酯)取代。交叉反应表明分子间步骤在正式的迁移过程中是可操作的,尽管未观察到与C-磺酰基产物的交叉。EPR研究表明,磺酰基的中间体,并基于这些观察结果提出了一种机理。
Thermal Ring Expansion of 2-Sulfonylimidoyl-1-phthalimidoaziridines into <i>N</i>
-Sulfonylimidazoles
作者:Aleksandr Stukalov、Vitalii V. Suslonov、Mikhail A. Kuznetsov
DOI:10.1002/ejoc.201701806
日期:2018.4.17
Di‐, tri‐substituted, and spiro‐fused 2‐sulfonylimidoyl‐1‐phthalimidoaziridines are transformed to di‐, tri‐substituted, and condensed N‐sulfonylimidazoles upon thermolysis. This ringexpansion is accompanied by an intramolecular 1,3‐sulfonyl shift.
[4+2] Annulation of Vinyl Ketones Initiated by a Phosphine-Catalyzed Aza-Rauhut-Currier Reaction: A Practical Access to Densely Functionalized Tetrahydropyridines
作者:Zugui Shi、Qinjie Tong、Wendy Wen Yi Leong、Guofu Zhong
DOI:10.1002/chem.201201318
日期:2012.8.6
The first example of phosphine catalyzed aza‐Rauhut–Currier reaction initiated [4+2] annulation of vinyl ketones with N‐sulfonyl‐1‐aza‐1,3‐dienes has been disclosed. Under the ambient conditions, this protocol provides a practical access to valuable densely functionalized tetrahydropyridines in good to excellent yields and high diastereoselectivities (see scheme).