3-4-diaminocyclobut-3-ene-1-2-dione has been researched along with isosteviol* in 2 studies
2 other study(ies) available for 3-4-diaminocyclobut-3-ene-1-2-dione and isosteviol
| Article | Year |
|---|---|
A novel isosteviol-based bifunctional squaramide organocatalyst for enantioselective Michael addition of acetylacetone to nitroolefins.
Chiral amine-squaramide is a kind of effective hydrogen bond donor bifunctional catalyst to promote many asymmetric transformations. In this paper, novel chiral tertiary amine-squaramide derived from the natural product of the stevioside was developed and applied into the asymmetric Michael addition of acetylacetone to nitroolefins. This asymmetric reaction performed well, and a series of enantiomerically enriched compounds were obtained in high yields (up to 96%) with excellent enantioselectivities (up to 99% ee). Topics: Alkenes; Diterpenes, Kaurane; Pentanones; Quinine; Stereoisomerism | 2022 |
Enantioselective synthesis of coumarins catalyzed by an isosteviol-derived tertiary amine-squaramide catalyst.
A newly tertiary amine-squaramide organocatalyst has been successfully developed and applied into the asymmetric Michael addition of 4-hydroxycoumarin to β,γ-unsaturated α-ketoesters. The catalyst system performed well with a low catalyst loading of 1 mol% under mild reaction conditions. A series of coumarin derivatives were obtained in good to high yields (up to 97%) with high enantioselectivities (up to 96% ee). Topics: Amines; Catalysis; Coumarins; Diterpenes, Kaurane; Quinine; Stereoisomerism | 2022 |