An article Enantioselective [3+2] annulation of 4-isothiocyanato pyrazolones and alkynyl ketones under organocatalysis WOS:000617008600021 published article about ASYMMETRIC-SYNTHESIS; 1,3-DIPOLAR CYCLOADDITION; AZOMETHINE YLIDES; DIASTEREOSELECTIVE SYNTHESIS; STEREOGENIC CENTERS; SPIROPYRAZOLONES; OXINDOLES; CONSTRUCTION; CASCADE; SPIROOXINDOLES in [Wang, Wenyao; Wei, Shiqiang; Bao, Xiaoze; Nawaz, Shah; Qu, Jingping; Wang, Baomin] Dalian Univ Technol, Sch Chem Engn, Dept Pharmaceut Sci, State Key Lab Fine Chem, Dalian 116024, Peoples R China in 2021.0, Cited 52.0. Name: 4-Methoxybenzaldehyde. The Name is 4-Methoxybenzaldehyde. Through research, I have a further understanding and discovery of 123-11-5
An asymmetric [3 + 2] annulation reaction of 4-isothiocyanato pyrazolones with alkynyl ketones in the presence of an organic catalyst derived from a cinchona alkaloid under mild conditions is realized. This protocol provides unprecedented expeditious access to a wide range of optically active spiro[pyrroline-pyrazolones] with various electronic properties in high yields with good to excellent enantioselectivities.
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Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles