Polysubstituted 5-Functionalized 2-Pyrone Derivatives: Facile Synthesis via Tandem Nucleophilic Addition/Lactonization Reaction of 1,2-Allenyl Esters
作者:Xian Huang、Ruwei Shen
DOI:10.1055/s-2006-942493
日期:2006.8
Polysubstituted 5-functionalized 2-pyrone derivatives were synthesized via the K 2 CO 3 -catalyzed reaction of 1,2-allenyl esters and α-substituted ketones with electron-withdrawing groups through a tandem nucleophilic addition/lactonization process.
多取代的5-官能化2-吡喃酮衍生物是通过1,2-烯基酯和α-取代酮与吸电子基团通过串联亲核加成/内酯化过程的K 2 CO 3 催化反应合成的。
Redox Isomerization/(3+2) Allenoate Annulation by Auto‐Tandem Phosphine Catalysis
作者:Jeremy T. Maddigan‐Wyatt、Mitchell T. Blyth、Jhi Ametovski、Michelle L. Coote、Joel F. Hooper、David W. Lupton
DOI:10.1002/chem.202103224
日期:2021.11.22
mediates the redox isomerization of amino crotonates to give imines which then undergo (3+2) annulation with a range of allenoates in a second phosphine catalyzed process. Computational studies indicate that pivotal to the success of this reaction is the use of catalysts with similar ability to add to both allenoate and crotonate.
Reaction of Allenyl Esters with Sodium Azide: An Efficient Synthesis of <i>E</i>-Vinyl Azides and Polysubstituted Pyrroles
作者:Xian Huang、Ruwei Shen、Tiexin Zhang
DOI:10.1021/jo062376m
日期:2007.2.1
The nucleophilic addition of sodium azide to 1,2-allenyl esters can generate vinyl azides in excellent yields with excellent regio- and stereoselectivities. Moreover, pyrroles are synthesized using 1-allyllic 1,2-allenyl esters as substrates in t-BuOH at 65 °C. The sequential reaction for pyrroles is developed on the basis of a novel domino process involving nucleophilic addition, cycloaddition, denitrogenation