Reactivity and Selectivity in the Intermolecular Alder–Ene Reactions of Arynes with Functionalized Alkenes
作者:Saswata Gupta、Peipei Xie、Yuanzhi Xia、Daesung Lee
DOI:10.1021/acs.orglett.7b02438
日期:2017.10.6
functionalized alkenes in intermolecular Alder–ene reactions with arynes is described. The arynes generated from bis-1,3-diynes react with various trisubstituted and 1,1-disubstituted alkenes containing hydroxyl, amino, halo, carboxyl, boronate, and 1,3-dienyl functionalities, providing product distributions with varying degrees of selectivity between Alder–ene and addition reactions. The geometry of
substrates 1 and 2 can be regioselectively converted into chiral allenyl alcohols 3 through the title reaction [Eq. (1)] with the synergetic reagent iPrSBEt2 and a chiral TiIV catalyst. The dramatic regioselectivity originates from the regulation of the equilibriumbetween propargyl- and allenylstannanes during the catalytic process.
The present invention relates to compounds useful as inhibitors of protein kinase. The invention also provides pharmaceutically acceptable compositions comprising said compounds and methods of using the compositions in the treatment of various disease, conditions, or disorders. The invention also provides processes for preparing compounds of the inventions.
Selective Catalytic Cross‐Cyclotrimerization En Route to1,4‐Diborylated Benzenes and Their Synthetic Transformations
作者:Alexander A. Fadeev、Gabriele Manca、Martin Kotora
DOI:10.1002/adsc.202201337
日期:——
available ethynyl boronate. The reaction is applicable to a wide array of alkynes with metal-coordinating groups, providing synthetically useful diborylated benzenes in 23–68% isolated yields. DFT calculations shed light on the reaction course and the origin of its remarkable regioselectivity. Selected diborylated benzenes were converted into various products, such as quinones and hydroquinones, including