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。
Lewis base-catalyzed diastereoselective [3 + 2] cycloaddition reaction of nitrones with electron-deficient alkenes: an access to isoxazolidine derivatives
A Lewis base-catalyzed [3 + 2] cycloadditionreaction of nitrones with electron-deficientalkenes has been achieved under mild reaction conditions, affording various functionalized isoxazolidine derivatives as single diastereomers in moderate to excellent yields.
Diastereoselective Synthesis of Chromeno[3,2-<i>d</i>]isoxazoles via Brønsted Acid Catalyzed Tandem 1,6-Addition/Double Annulations of <i>o</i>-Hydroxyl Propargylic Alcohols
作者:Zhu Li、Pei-Xu Zhang、Zhao-Zhao Li、Xing-Lu Zhang、Hong-Yuan Cao、Yu-Ning Gao、Ming Bian、Hui-Yu Chen、Zhen-Jiang Liu
DOI:10.1021/acs.orglett.2c02830
日期:2022.9.23
A Brønsted acid catalyzed tandem process to access densely functionalized chromeno[3,2-d]isoxazoles with good to excellent yields and diastereoselectivities was disclosed. The procedure is proposed to involve a 1,6-conjugate addition/electrophilic addition/double annulations process of alkynyl o-quinone methides (o-AQMs) in situ generated from o-hydroxyl propargylic alcohols with nitrones. Mild conditions
公开了一种布朗斯台德酸催化的串联工艺,用于获得致密官能化的铬烯基 [3,2- d ] 异恶唑,具有良好至优异的产率和非对映选择性。该程序拟涉及 1,6-共轭加成/亲电加成/双环化炔基邻苯二酚甲基化物 (o -AQMs) 的过程,原位由邻羟基炔丙醇和硝酮生成。温和的条件、良好的官能团相容性、易于放大反应和进一步的产品转化展示了其潜在的应用。
Synthesis of 2-arylethenesulfonyl fluorides and isoindolinones: Ru-catalyzed C–H activation of nitrones with ethenesulfonyl fluoride
作者:Tong-Tong Wang、Li-Ming Zhao
DOI:10.1039/d2cc03418b
日期:——
2-arylethenesulfonyl fluorides from nitrones and ethenesulfonyl fluoride (ESF) by the activation of the C–H bond using an inexpensive and readily available Ru-catalyst has been developed. In this process, the directing group can be concomitantly converted to an amide group. Interestingly, changing the substituent of the nitrogen of nitrones from a tert-butyl to a methyl group resulted in the formation of cyclic isoindolinones