Quality Control of 4-Methoxybenzaldehyde. Authors Penaska, T; Palchykov, V; Rakovsky, E; Addova, G; Sebesta, R in WILEY-V C H VERLAG GMBH published article about in [Penaska, Tibor; Palchykov, Vitalii; Addova, Gabriela; Sebesta, Radovan] Comenius Univ, Fac Nat Sci, Dept Organ Chem, Ilkovicova 6, Bratislava 84215, Slovakia; [Palchykov, Vitalii] Oles Honchar Dnipro Natl Univ, Res Inst Chem & Geol, Gagarina Av 72, UA-49010 Dnipro, Ukraine; [Rakovsky, Erik] Comenius Univ, Fac Nat Sci, Dept Inorgan Chem, Ilkovicova 6, Bratislava 84215, Slovakia in 2021.0, Cited 61.0. The Name is 4-Methoxybenzaldehyde. Through research, I have a further understanding and discovery of 123-11-5
We have investigated the stereoselective formation of spiro oxindole pyrrolidines via formal [3+2] cycloaddition of oxindole imines with ketoesters and ketoamides. Bifunctional squaramide organocatalyst was able to induce enantioselectivity of up to 60 % ee, increased to 72 % ee after re-crystallization, in the formation of spiro pyrrolidines with ketoesters. Interestingly, ketoamides provided alternative spiro oxindole pyrrole products in addition to the main product, which was formed via a different reaction pathway. Structures of spiro oxindole pyrrolidine as well as pyrrole products were confirmed by X-ray crystallographic analysis. Two new squaramide based catalysts were synthesized and tested. DFT calculation helped elucidate the reaction course.
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,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles