Microwave‐Assisted 1,3‐Dioxa‐[3,3]‐Sigmatropic Rearrangement of Substituted Allylic Carbamates: Application to the Synthesis of Novel 1,3‐Oxazine‐2,4‐dione Derivatives
The acceleration of 1,3-dioxa-[3,3]-sigmatropicrearrangement of aryl allylic carbamates under microwave irradiation was described. The implementation of these unconventional thermal conditions allowed the development of an original synthetic route to new heterocycle products such as (E)-5-arylidene-1,3-oxaninane-2,4-diones.
描述了在微波辐射下芳基烯丙基氨基甲酸酯的 1,3-二氧杂环己烷-[3,3]-sigmatropic 重排的加速。这些非常规热条件的实施允许开发新的杂环产品的原始合成路线,例如 ( E )-5-亚芳基-1,3-oxaninane-2,4-二酮。
Mild Darzens Annulations for the Assembly of Trifluoromethylthiolated (SCF<sub>3</sub>) Aziridine and Cyclopropane Structures
作者:Michael D. Delost、Jon T. Njardarson
DOI:10.1021/acs.orglett.1c02204
日期:2021.8.6
We report mild new annulation approaches to trisubstituted trifluoromethylthiolated (SCF3) aziridines and cyclopropanes via Darzens inspired protocols. The products of these anionic annulations, rarely studied previously, possess attractive features rendering them valuable building blocks for synthesis platforms. In this study, trisubstituted acetophenone nucleophiles bearing SCF3 and bromine substituents
作者:Angus W.J. Logan、Jeremy S. Parker、Michal S. Hallside、Jonathan W. Burton
DOI:10.1021/ol300625u
日期:2012.6.15
Manganese(III) acetatemediated oxidative radicalcyclizations have been used to synthesize a range of densely functionalized and sterically congested cyclopentane-lactones. A number of the resulting lactones contain vicinal all-carbon quaternary stereocenters adjacent to a tertiary benzylic stereocenter and are formed with high levels of stereocontrol.
[(NHC)Au<sup>I</sup>]-Catalyzed Rearrangement of Allylic Acetates
作者:Nicolas Marion、Ronan Gealageas、Steven P. Nolan
DOI:10.1021/ol070843w
日期:2007.7.1
[(NHC)AuCl] complexes (NHC = N-heterocycliccarbene), in conjunction with a silver salt, were found to efficiently catalyze the rearrangement of allylic acetates under both conventional and microwave-assisted heating. The optimization of several reaction parameters (solvent, silver salt, and ligand) as well as a study of the reaction scope are reported. The steric hindrance of the ligand bound to gold was
An efficient oxytrifluoromethylation of 1-aryl-substituted allylalcohols has been developed using Togni’s reagent II as a trifluoromethylation reagent and copper(I) chloride as a catalyst. This reaction proceeded through a one-pot process of trifluoromethylation followed by nucleophilic attack of the vicinal hydroxyl group. This strategy features good diastereoselectivity and broad substrate scope
已使用 Togni 试剂 II 作为三氟甲基化试剂和氯化铜 (I) 作为催化剂开发了 1-芳基取代的烯丙醇的有效氧三氟甲基化。该反应通过三氟甲基化的一锅法进行,然后是邻羟基的亲核攻击。该策略具有良好的非对映选择性和广泛的底物范围,可以轻松获得各种 2-芳基-3-(2,2,2-三氟乙基)环氧乙烷。