Metal- and Photocatalysis To Gain Regiocontrol and Stereodivergence in Hydroarylations of Unsymmetrical Dialkyl Alkynes
作者:Javier Corpas、M. Teresa Quirós、Pablo Mauleón、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1021/acscatal.9b02768
日期:2019.11.1
regioselective, stereodivergent catalytic hydroarylation of unsymmetrical dialkyl alkynes with arylboronic acids that allows highly selective access to either the E or Z diastereoisomer of trisubstitutedalkenes. The E selectivity is achieved through syn-carbopalladation of the alkyne by Ar–Pd species followed by protodepalladation in which a 2-pyridyl sulfonyl (SO2Py) directing group enables complete
Synthesis of 2-Acetylenic Carboxylic Acids, 1-Sulfinyl and 1-Sulfonyl-2-ketones from 2-Acetylenic Phenyl Sulfides
作者:Carlos C. Fortes、Clevia F.D. Garrote
DOI:10.1080/00397919708005006
日期:1997.9
2-acetylenic phenyl sulfides into 1-methoxy-2-acetylenic phenyl sulfides. Oxidation with chromic acid gave 2-acetylenic carboxylic acids. Oxidation of 2-acetylenic phenyl sulfides with Oxone® and hydrogen peroxide in aceticacid gave the corresponding sulfoxides and sulfones respectively. Diethylamine addition to the triple bond produced enamines which were hydrolyzed with aqueous hydrochloric acid to the corresponding