m-Iodosylbenzoic Acid: Recyclable Hypervalent Iodine Reagent for α-Tosyloxylation and α-Mesyloxylation of Ketones
摘要:
m-Iodosylbenzoic acid-mediated reactions of various carbonyl compounds provided -organosulfonyloxy carbonyl compounds in good yields. The final products could be easily isolated without any chromatographic purification by simple treatment of the crude mixture with an anionic exchange resin.
Direct Synthesis of 3-Acylindoles through Rhodium(III)-Catalyzed Annulation of<i>N</i>-Phenylamidines with α-Cl Ketones
作者:Jianhui Zhou、Jian Li、Yazhou Li、Chenglin Wu、Guoxue He、Qiaolan Yang、Yu Zhou、Hong Liu
DOI:10.1021/acs.orglett.8b03383
日期:2018.12.7
versatile 3-acylindoles through Rh(III)-catalyzed C–H activation and annulation cascade of N-phenylamidines with α-Cl ketones was developed, in which α-Cl ketones serve as unusual one-carbon (sp3) synthons. This strategy features high regioselectivity, efficiency, wide substrate tolerance, and mild reaction conditions, which further underscore its synthetic utility in drug molecule synthesis.
A Cascade C-H-Functionalization/Cyclization Reaction of Indoles with α-Halo or α-Sulfonyloxy Ketones for the Synthesis of Dihydropyrimidoindolone Derivatives
作者:Zi-Jun Wu、Ya-Qiong Li、Zhi-Zhen Huang
DOI:10.1002/ejoc.201600885
日期:2016.11
A new cascade C–H-functionalization/cyclization reaction of N-carbamoylindoles 1 with α-halo, α-mesyloxy, or α-tosyloxy ketones 2 has been developed under rhodium(III) catalysis, leading to dihydropyrimido[1,6-a]indolone derivatives 3 in moderate to excellent yields.
readily available N-(2-pyridyl)anilines and commercially available α-Cl ketones through iridium-catalyzed C–H activation and cyclization is reported here. As a complementary approach to the conventional strategies for indole synthesis, the transformation exhibits powerful reactivity, tolerates a large number of functional groups, and proceeds with good to excellent yields undermildconditions, providing
A practical method for the asymmetric transferhydrogenation of α‐substituted ketones was developed utilizing oxo‐tethered N‐sulfonyldiamine‐ruthenium complexes. Reduction by HCO2H and HCO2K in a mixed solvent of EtOAc/H2O allowed for the selective synthesis of halohydrins from 2‐bromoacetophenone (98%) and 2‐chloroacetophenone (>99%), leading to suppressed undesired side reactions stemming from formylation
Reaction of 1-Nitroso-2-naphthols with α-Functionalized Ketones and Related Compounds: The Unexpected Formation of Decarbonylated 2-Substituted Naphtho[1,2-<i>d</i>][1,3]oxazoles
作者:Nayyef Aljaar、Chandi C. Malakar、Jürgen Conrad、Wolfgang Frey、Uwe Beifuss
DOI:10.1021/jo3022956
日期:2013.1.4
Reactions between 1-nitroso-2-naphthols and α-functionalized ketones such as α-bromo-, α-chloro-, α-mesyloxy-, α-tosyloxy-, and α-hydroxy ketones under basic conditions delivered 2-substituted naphtho[1,2-d][1,3]oxazoles in a single synthetic operation. The product formation was accompanied by the unexpected loss of the C═O group from the α-functionalized ketones. With aryl bromides, allyl bromides
1-亚硝基-2-萘与α-官能化酮如α-溴代,α-氯代,α-甲氧基,α-甲苯磺酰基和α-羟基酮之间的反应在碱性条件下产生了2-取代的萘并[一次合成操作中的1,2- d ] [1,3]恶唑。产物的形成伴随有α-官能化酮中C═O基团的意外损失。以芳基溴化物,烯丙基溴化物,α-溴二酮,α-溴氰化物,α-溴酸酯和α-溴酮酸酯为底物,还观察到了萘并[1,2- d ] [1,3]恶唑的形成。在回流下在1,2-二氯乙烷或乙腈中进行转化,得到相应的萘并恶唑,产率在52%至85%之间。