Direct Organocatalytic Asymmetric Heterodomino Reactions: The Knoevenagel/Diels−Alder/Epimerization Sequence for the Highly Diastereoselective Synthesis of Symmetrical and Nonsymmetrical Synthons of Benzoannelated Centropolyquinanes
作者:D. B. Ramachary、K. Anebouselvy、Naidu S. Chowdari、Carlos F. Barbas
DOI:10.1021/jo049581r
日期:2004.9.1
Aminoacids and amines have been used to catalyze three component hetero-domino Knoevenagel/Diels−Alder/epimerization reactions of readily available various precursor enones (1a−l), aldehydes (2a−p), and 1,3-indandione (3). The reaction provided excellent yields of highly substituted, symmetrical and nonsymmetrical spiro[cyclohexane-1,2‘-indan]-1‘,3‘,4-triones (5) in a highly diastereoselective fashion
Shternberg,I.Ya.; Freimanis,Ya.F., Journal of Organic Chemistry USSR (English Translation), 1970, vol. 6, p. 47 - 49
作者:Shternberg,I.Ya.、Freimanis,Ya.F.
DOI:——
日期:——
Towards Organo-Click Chemistry: Development of Organocatalytic Multicomponent Reactions Through Combinations of Aldol, Wittig, Knoevenagel, Michael, Diels-Alder and Huisgen Cycloaddition Reactions
作者:Dhevalapally B. Ramachary、Carlos F. Barbas
DOI:10.1002/chem.200400597
日期:2004.11.5
copper(I) for catalyzing multicomponent reactions (MCRs). We aimed to prepare both diene and dienophiles simultaneously, under very mild and environmentally friendly conditions, thus giving the constituents for a stereocontrolled Diels-Alder reaction, which in turn yields compounds 4 to 8. A diversity-oriented synthesis of polysubstituted spirotriones 4 to 6 were assembled from simple substrates like
Stereochemistry in control of photochemical reactivity: 2,6-Diaryl-4 H -spiro[cyclohexane-1,2′-indene]-1′,3′,4-triones
作者:Vladimir Lokshin、Vladimir Khodorkovsky
DOI:10.1016/j.tet.2017.12.014
日期:2018.1
Photochemical reaction of trans-2,6-diaryl-4H-spiro[cyclohexane-1,2′-indene]-1′,3′,4-triones gives rise to the formation of the ylidenephthalide derivatives as previously observed for 2,2-disubstituted 1,3-indandiones. In contrast, the respective cis-isomers afford different products originating from the unprecedented reversible cyclohexanone cycle breaking (photo-induced retro-Michael reaction). The