Herein we report an effective and simple preparation method of substituted azoxybenzenes by reductive dimerization of nitrosobenzenes. This procedure requires no additional catalyst/reagent and can be applied to substrates with a wide range of substitution patterns.
Single-Step Approach toward Nitrones via Pyridinium Ylides: The DMAP-Catalyzed Reaction of Benzyl Halides with Nitrosoarenes
作者:Yeonghun Jung、Jee Eun Hong、Jae-Hwan Kwak、Yohan Park
DOI:10.1021/acs.joc.1c00158
日期:2021.5.7
single-step approach is reported for the preparation of nitrones from benzyl halides and nitrosoarenes via pyridinium ylides, utilizing 4-dimethylaminopyridine (DMAP) catalyst and mild reaction conditions (Li2CO3, dimethylacetamide, and room temperature). The reaction provides both keto- and aldonitrones in high yields with a wide scope for benzyl halides and nitrosoarenes. In the same reaction system,
据报道,采用4-二甲基氨基吡啶(DMAP)催化剂和温和的反应条件(Li 2 CO 3,二甲基乙酰胺和室温)通过吡啶鎓叶立德从苄基卤化物和亚硝基芳烃制备硝酮的一步法。该反应高产率地提供了酮-和醛基酮,并广泛用于苄基卤化物和亚硝基芳烃。在相同的反应系统中,2-甲基-2-亚硝基丙烷,其不具有的芳基,也得到相应的Ñ -叔来自具有吸电子基团的伯苄基溴化物中的-丁基硝酮。作为反应的应用,通过顺序一锅合成,使用2-溴-2-苯基乙酸甲酯制备相应的异恶唑烷。
Cascade Reaction of Donor–Acceptor Cyclopropanes: Mechanistic Studies on Cycloadditions with Nitrosoarenes and <i>cis</i>-Diazenes
作者:Tristan Chidley、Naresh Vemula、Cheryl A. Carson、Michael A. Kerr、Brian L. Pagenkopf
DOI:10.1021/acs.orglett.6b01269
日期:2016.6.17
Tandem ring opening, elimination, and cycloaddition of donor–acceptor cyclopropanes were observed in Yb(OTf)3-catalyzed cycloaddition with nitrosoarenes. The reaction results in formation of tetrahydro-1,2-oxazine instead of the normal cycloadduct isoxazolidine via in situ nitrone formation. A similar cascade sequence was observed with cis-diazines. Mechanistic studies on this unique transformation offer
Novel compounds of Formula (I) or pharmaceutically acceptable salts thereof, metabolites thereof, isomers thereof, enantiomers thereof or prodrugs thereof of Formula (I)
wherein the substituents are as defined herein, which are useful as therapeutic agents.