Isothiourea-catalysed enantioselective Michael addition of N-heterocyclic pronucleophiles to α,β-unsaturated aryl esters
作者:Chang Shu、Honglei Liu、Alexandra M. Z. Slawin、Cameron Carpenter-Warren、Andrew D. Smith
DOI:10.1039/c9sc04303a
日期:——
The isothiourea-catalysed enantioselective Michaeladdition of 3-aryloxindole and 4-substituted-dihydropyrazol-3-one pronucleophiles to α,β-unsaturated p-nitrophenyl esters is reported. This process generates products containing two contiguous stereocentres, one quaternary, in good yields and excellent enantioselectivities (>30 examples, up to > 95 : 5 dr and 99 : 1 er). This protocol harnesses the
[EN] N-SUBSTITUTED HYDROXAMIC ACIDS WITH CARBON-BASED LEAVING GROUPS AS EFFICIENT HNO DONORS AND USES THEREOF<br/>[FR] ACIDES HYDROXAMIQUES N-SUBSTITUÉS COMPORTANT DES GROUPES PARTANTS À BASE DE CARBONE SERVANT DE DONNEURS DE HNO EFFICACES ET UTILISATIONS DE CEUX-CI
申请人:UNIV JOHNS HOPKINS
公开号:WO2016210392A1
公开(公告)日:2016-12-29
N-substituted hydroxamic acids with carbon-based leaving groups as efficient HNO donors are disclosed. Pharmaceutical compositions and kits comprising such compounds, and methods of using such compounds or pharmaceutical compositions also are disclosed.
Development of N-Substituted Hydroxamic Acids with Pyrazolone Leaving Groups as Nitrosocarbonyl Precursors
作者:Saghar Nourian、Zachary A. Zilber、John P. Toscano
DOI:10.1021/acs.joc.6b01705
日期:2016.10.7
precursors, N-substituted hydroxamic acids with pyrazolone leaving groups (NHPY), has been synthesized. Under physiological conditions, these compounds generate nitrosocarbonyl intermediates, which upon hydrolysis release nitroxyl (azanone, HNO) in excellent yields. The amount and rate of nitrosocarbonyl generation are dependent on the nature of the pyrazolone leaving groups and significantly on the structural
Regio‐ and Stereoselective Synthesis of 3‐Pyrazolylidene‐2‐oxindole Compounds by Nucleophilic Vinylic Substitution of (
<i>E</i>
)‐3‐(Nitromethylene)indolin‐2‐one
作者:Carlos Vila、Sophie Slack、Gonzalo Blay、M. Carmen Muñoz、José R. Pedro
DOI:10.1002/adsc.201900048
日期:2019.4.16
highly regio‐ and stereoselective synthesis of 3‐alkylidene‐2‐oxindoles has been described through a nucleophilic vinylic substitution (SNV) of (E)‐3‐(nitromethylene)indolin‐2‐one using pyrazol‐3‐ones as nucleophiles and Et3N as a base. The reaction affords selectively the Z‐isomer when pyrazol‐3‐ones without substituents at the 4 position are used. While the reaction is E‐selective with 4‐substituted
Regio-, Diastereo-, and Enantioselective Organocatalytic Addition of 4-Substituted Pyrazolones to Isatin-Derived Nitroalkenes
作者:Carlos Vila、Nisshanth Raj Dharmaraj、Antonio Faubel、Gonzalo Blay、M. Luz Cardona、M. Carmen Muñoz、José R. Pedro
DOI:10.1002/ejoc.201900328
日期:2019.5.26
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