Zinc Iodide-Mediated Direct Synthesis of 2,3-Dihydroisoxazoles from Alkynes and Nitrones
作者:Zu-Feng Xiao、Ting-Hui Ding、Sheng-Wei Mao、Xiao-Shan Ning、Yan-Biao Kang
DOI:10.1002/adsc.201600044
日期:2016.6.2
A zinc diiodide (ZnI2)‐mediated directsynthesis of 2,3‐dihydroisoxazoles via a [3+2] cycloaddition reaction of the nitrones and non‐electron‐deficient terminalalkynes has been developed. This method was applied in the formal synthesis of HPA‐12 and aminoglucose.
Diversity-oriented synthesis of 1,2,3,5-tetrahydrobenzo[e][1,2,4]oxadiazepines and 2,3-dihydro-1H-benzo[e][1,2,4]triazepines by base-induced [4 + 3] annulation reactions
作者:Wuyan Long、Shuangqun Chen、Xiaohong Zhang、Ling Fang、Zhiyong Wang
DOI:10.1016/j.tet.2018.09.004
日期:2018.10
The base-induced formal [4 + 3] annulation reactions of N-(ortho-chloromethyl)aryl amides with nitrones or hydrazonoyl chlorides have been reported. When nitrones are used as the 1,3-dipole, the corresponding reaction afforded a series of 1,2,3,5-tetrahydrobenzo[e][1,2,4]oxadiazepine derivatives. Highly functionalized 2,3-dihydro-1H-benzo[e][1,2,4]triazepine derivatives were also synthesized via an
已经报道了碱诱导的N-(邻氯甲基)芳基酰胺与硝酮或酰肼基氯化物的正式[4 + 3]环化反应。当将硝酮用作1,3-偶极时,相应的反应得到一系列1,2,3,5-四氢苯并[ e ] [1,2,4]恶二氮杂衍生物。还通过N-(邻-氯甲基)芳基酰胺和酰基之间空前的串联氮杂-迈克尔加成/重排芳构化反应合成了高度官能化的2,3-二氢-1 H-苯并[ e ] [1,2,4]三氮杂卓衍生物氯化物。
Copper(I)-Catalyzed Asymmetric 1,3-Dipolar [3+4] Cycloaddition of Nitrones with Azoalkenes
作者:Liang Wei、Lu Yao、Zuo-Fei Wang、Hua Li、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1002/adsc.201600457
日期:2016.12.7
The first copper(I)‐catalyzed asymmetric1,3‐dipolar [3+4] cycloaddition of nitrones with azoalkenes has been developed, affording a variety of biologically important 1,2,4,5‐oxatriazepane derivatives in good yields with exclusive regioselectivities and excellent enantioselectivities.
y Competitividad (MINECO) (project number CTQ2016–76155‐R), by the Fondos Europeos para el Desarrollo Regional (FEDER) and the Gobierno de Aragon (Group E34_R17; Zaragoza, Spain, Biological and Computational Chemistry Group, BCC). J. G.‐V. thanks the Gobierno de Aragon–FSE for a pre‐doctoral Grant.
这项工作得到了西班牙经济与竞争部 (MINECO)(项目编号 CTQ2016–76155-R)、Fondos Europeos para el Desarrollo Regional(FEDER)和 Gobierno de Aragon(Group E34_R17;西班牙萨拉戈萨,生物和计算化学组,BCC)。JG-V。感谢 Gobierno de Aragon-FSE 的博士前资助。
Synthesis of 1,5-Disubstituted Tetrazoles from Nitrones by Using Bis(p-nitrophenyl) Phosphorazidate in the Presence of 4-(Dimethylamino)pyridine
A novel method has been developed for the synthesis of 1,5-disubstituted tetrazoles from nitrones by using bis(p-nitrophenyl) phosphorazidate in the presence of 4-(dimethylamino)pyridine. By this approach, various nitrones were converted into the corresponding tetrazoles. This method permits the preparation of 1,5-disubstituted tetrazoles without the need for toxic or explosive reagents.