Silver-Promoted Benzannulations of Siloxyalkynes with Pyridinium and Isoquinolinium Salts
作者:Jaime R. Cabrera-Pardo、David I. Chai、Sergey A. Kozmin
DOI:10.1002/adsc.201300443
日期:2013.9.16
efficient benzannulations of siloxyalkynes with pyridinium and isoquinolinium salts. Such reactions are successfully promoted by a stoichiometric amount of silver(I) benzolate under mild reaction conditions. This process proceeds via a formal inverse‐electron demand Diels–Alder reaction, followed by fragmentation of the initially produced bicyclic adducts to deliver a range of synthetically useful phenols
Disclosed is a hydrocarboxylation process for the production of carboxylic acid from olefins wherein an olefin, water, a Group VIII metal hydrocarboxylation catalyst, an onium salt compound are combined in a reaction zone and contacted with carbon monoxide under hydrocarboxylation conditions of pressure and temperature The process does not require or utilize the addition of a hydrogen halide or an alkyl halide exogenous or extraneous to the hydrocarboxylation process.
Synthesis of Stereoenriched Piperidines via Chemo-Enzymatic Dearomatization of Activated Pyridines
作者:Vanessa Harawa、Thomas W. Thorpe、James R. Marshall、Jack J. Sangster、Amelia K. Gilio、Lucian Pirvu、Rachel S. Heath、Antonio Angelastro、James D. Finnigan、Simon J. Charnock、Jordan W. Nafie、Gideon Grogan、Roger C. Whitehead、Nicholas J. Turner
DOI:10.1021/jacs.2c07143
日期:2022.11.23
efficient and sustainable methods for the synthesis of nitrogen heterocycles is an important goal for the chemical industry. In particular, substituted chiral piperidines are prominent targets due to their prevalence in medicinally relevant compounds and their precursors. A potential biocatalytic approach to the synthesis of this privileged scaffold would be the asymmetric dearomatization of readily assembled