Altarejos et al. Eur J Org Chem. 2020:3024-3029. Practical Solvent-Free Microwave-Assisted Hydroboration of Alkynes

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Practical Solvent-Free Microwave-Assisted Hydroboration of Alkynes.

Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, IRYCIS, 28805 Madrid, Alcalá de Henares, Spain.

javier.carreras@uah.es

Abstract

A simple and rapid protocol for the anti-Markovnikov hydroboration of alkynes assisted by microwave irradiation has been developed. Pinacolborane smoothly reacts with terminal alkynes to obtain (E)-alkenyl boronates in good yields and short reactions times in the absence of solvent. Further transformations on the carbon-boron bond of the adducts can be sequentially achieved without the need of purifying the alkenyl boronates.

graphical abstract