A new synthetic path toward oxazoles starting from isocyanides is presented. This two-step oxazole preparation involves a bromination-cyclization followed by a Suzuki cross-coupling.
Silver-Catalyzed Asymmetric Desymmetrization of Cyclopentenediones via [3 + 2] Cycloaddition with α-Substituted Isocyanoacetates
作者:Jimil George、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.8b00590
日期:2018.4.20
A highly selective and practical asymmetric Ag(I) catalyst system has been developed for the [3 + 2] cycloaddition reactions between isocyanoacetates and cyclopentenediones. The current Ag(I) catalyst system tolerates moisture and air and readily utilizes class III solvents such as EtOAc and acetone. The development of on demand generation of an active chiral catalyst in the presence of isocyanides
Regioselective Synthesis of Pyrroles from Alkyne-Isocyanide Click Reactions: An Angle Strain-Induced Bond Migration Approach
作者:Jimil George、Hun Young Kim、Kyungsoo Oh
DOI:10.1002/adsc.201601017
日期:2016.12.7
direct regioselective synthesis of highly functionalized pyrroles with two different electron‐withdrawing groups has been developed using an angle strain‐induced 1,2‐shift of an electron‐withdrawing group in 2H‐pyrroles. The preferential migration aptitude of an electron‐withdrawing group over alkyl and aryl groups is believed to be the result of the orbital overlap between the internal alkene and the
Chiral squaramides catalyzed diastereo- and enantioselective Michael addition of α-substituted isocyanoacetates to N-aryl maleimides
作者:Mei-Xin Zhao、Fei-Hu Ji、Deng-Ke Wei、Min Shi
DOI:10.1016/j.tet.2013.09.084
日期:2013.12
An efficient diastereo- and enantioselective Michael addition of α-substituted isocyanoacetates to N-aryl maleimidescatalyzed by quinine or cyclohexane-1,2-diamine derived squaramide catalysts has been disclosed, affording the corresponding adducts in good yields (up to 99%), high diastereoselectivities (up to >20:1 dr) and good to excellent enantioselectivities (up to 94% ee) under mild conditions
Cinchona alkaloid thiourea mediated asymmetric Mannich reaction of isocyanoacetates with isatin-derived ketimines and subsequent cyclization: enantioselective synthesis of spirooxindole imidazolines
作者:Mei-Xin Zhao、Lei Jing、Hao Zhou、Min Shi
DOI:10.1039/c5ra17075c
日期:——
The organocatalyzed asymmetric Mannich reaction of isocyanoacetates with isatin ketimines and subsequent cyclization were developed, leading to spirooxindole imidazolines in high yields and excellent stereoselectivities.
Metal‐free Decarboxylative Annulation of 2‐Aryl‐2‐isocyano‐acetates with Aryldiazonium Salts: General Access to 1,3‐Diaryl‐1,2,4‐triazoles
作者:Yu‐Ting Tian、Fa‐Guang Zhang、Jing Nie、Chi Wai Cheung、Jun‐An Ma
DOI:10.1002/adsc.202001016
日期:2021.1.5
Isocyanoacetates are versatile substrates for the synthesis of heterocyclic compounds, but the concomitant decarboxylation remains rare. Herein we report a decarboxylative annulation reaction of 2‐aryl‐2‐isocyanoacetates with aryldiazonium salts. This metal‐free, base‐promoted protocol allows for the access to a broad collection of 1,3‐diaryl‐1,2,4‐triazoles, including chiral triazole‐based binaphthalene