Photochemical Behavior of Indane-1,2,3-trione in Degassed Alcoholic Solutions: Formation of 3-Substituted Phthalides
作者:Jiro Tatsugi、Tomoaki Hara、Yasuji Izawa
DOI:10.1246/cl.1997.177
日期:1997.2
the major product together with 3-alkoxyphthalides. 3-Alkoxycarbonylphthalides may be derived from the reaction between alcohols and the spirooxiranone intermediate, generated photochemically by cleavage of the bond between two carbonyl groups of indane-1,2,3-trione via a cyclobutenone biradical derivative.
Quinine-derived thiourea promoted enantioselective Michael addition reactions of 3-substituted phthalides to maleimides
作者:Jie Wang、Xin Li、Jin-Pei Cheng
DOI:10.1007/s11426-018-9393-2
日期:2019.5
A highly diastereoselective and enantioselective Michael addition/desymmetrization reaction of maleimides with prochiral 3- substituted phthalides catalyzed by quinine-derived bifunctional thiourea was realized. A broad range of the 3,3′-disubstituted phthalides bearing vicinal quaternary-tertiary stereogenic centers were synthesized in moderate to good yields (up to 96%) with high diastereoselectivities