Synthesis 2019; 51(16): 3151-3159
DOI: 10.1055/s-0037-1611820
paper
© Georg Thieme Verlag Stuttgart · New York

Organocatalytic Gram-Scale Synthesis and Alkylation of Heteroaryl and Electron-Rich Aryl α-Substituted γ-Lactones

Maxence Bos
,
Floris Buttard
,
Alexis Vallée
,
Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims, CNRS UMR 7312, UFR des Sciences Exactes et Naturelles, BP 1039, 51687 Reims Cedex 2, France   eMail: Emmanuel.riguet@univ-reims.fr
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We gratefully thank the Agence Nationale de la Recherche for financial support (HFOrgCat project ANR JCJC: ANR-12-JS07-0009).
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Publikationsverlauf

Received: 28. Februar 2019

Accepted after revision: 09. April 2019

Publikationsdatum:
30. April 2019 (online)


Abstract

The synthesis of γ-lactones α-substituted with heterocycles and electron-rich aromatic rings is described. The method, based on a sequence involving an organocatalytic addition of boronic acid to the 5-hydroxyfuran-2(5H)-one, followed by reduction and lactonization, gives access to broad range of γ-lactones on a gram scale. Among these, γ-lactones bearing a benzofuran, a benzothiophene, and an indole ring were alkylated in mild catalytic conditions to construct α-quaternary stereocenters. Interesting mild oxidation reaction, using molecular oxygen, was also highlighted during this study.

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