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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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