Formation of β-Oxo-<i>N</i>-vinylimidates via Intermolecular Ester Incorporation in Huisgen Cyclization/Carbene Cascade Reactions
作者:Qinxuan Wang、Jeremy A. May
DOI:10.1021/acs.orglett.0c03619
日期:2020.12.18
Unusual intermolecular trapping of esters by carbenes generated via a Huisgen cyclization/retroelectrocyclization/dediazotization cascadereaction is presented. β-Oxo-N-vinylimidates could be obtained in one step from propargyl carbonazidates. Mechanistic control experiments suggested reversible dipole formation by ester addition to the carbene, and nitrogen attack to the ester carbonyl was irreversibly
We have developed a unified strategy for preparing a variety of imidazo‐fused N‐heteroaromatic compoundsthrough regiospecific electrochemical (3+2) annulation reaction of heteroarylamines with tethered internal alkynes. The electrosynthesis employs a novel tetraarylhydrazine as the catalyst, has a broad substrate scope, and obviates the need for transition‐metal catalysts and oxidizing reagents.
Heterocyclic compounds and their preparation and use
申请人:——
公开号:US20020115697A1
公开(公告)日:2002-08-22
The present invention relates to therapeutically active azabicyclic compounds, a method of preparing the same and to pharmaceutical or veterinary compositions comprising the compounds. The novel compounds are useful in treating a disease in the central nervous system caused by malfunctioning of the muscarinic cholinergic system.