The reaction of keto-stabilized sulphonium and arsonium ylides with α-chlorooximes
作者:P. Bravo、G. Gaudiano、P.P. Ponti、C. Ticozzi
DOI:10.1016/s0040-4020(01)93832-3
日期:1972.1
The reaction of α-chlorooximes or the isomeric nitrosochlorides with keto-stabilized dimethylsulphonium or triphenylarsonium ylides affords trans-5-acyl-Δ2-isoxazolines (VIIa-m) in good yields. The NOCI adducts of ethylpropenyl ether and ethylstyryl ether on reaction with dimethylsulphonium phenacylide lead directly to the corresponding 3-substituted-5-benzoylisoxazo]es. Dimethylsulphonium carbethoxymethylide
Copper Nitrate Mediated Regioselective [2+2+1] Cyclization of Alkynes with Alkenes: A Cascade Approach to Δ<sup>2</sup>-Isoxazolines
作者:Mingchun Gao、Yingying Li、Yuansheng Gan、Bin Xu
DOI:10.1002/anie.201503393
日期:2015.7.20
An efficient method for the regioselective synthesis of pharmacologically relevant polysubstituted Δ2‐isoxazolines is based on the copper‐mediated direct transformation of simple terminal alkynes and alkenes. The overall process involves the formation of four chemical bonds with inexpensive and readily available copper nitrate trihydrate as a novel precursor of nitrile oxides. The reaction can be easily