CC BY-NC-ND 4.0 · Synlett 2023; 34(20): 2393-2395
DOI: 10.1055/a-2100-1575
cluster
Special Issue Dedicated to Prof. Hisashi Yamamoto

Brønsted Acid Catalyzed Asymmetric Silylation of Biaryl Diols

Jung Tae Han
,
Hui Zhou
,
Benjamin List
Generous support from the Deutsche Forschungsgemeinschaft (Leibniz Award to B.L. and Germany’s Excellence Strategy–EXC 2033–390677874–RESOLV), and the European Research Council (European Union’s Horizon 2020 research and innovation program ‘Early Stage Organocatalysis, ESO’) is gratefully acknowledged.


Abstract

We report a Brønsted acid catalyzed enantioselective silylation of biaryl diols with an allylsilane as a silicon source. This process enables facile access to enantioenriched biaryl silyl ethers with an axial stereogenicity. A control experiment supports a mechanism proceeding by desymmetrization followed by kinetic resolution.

Supporting Information



Publication History

Received: 30 April 2023

Accepted after revision: 23 May 2023

Accepted Manuscript online:
25 May 2023

Article published online:
12 July 2023

© 2023 . This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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  • 9 Silylation of Biaryl Diols; General Procedure A GC vial equipped with a Teflon-coated magnetic stir bar was charged with catalyst 4 (2.5 mol%), biaryl diol 1 (0.1 mmol) and solvent (CHCl3 or CH2Cl2), and the resulting mixture was cooled to –50 or –30 °C in a cryostat. After 10 min, allylsilane 2 (2 or 1.5 equiv.) was slowly added and the reaction mixture was stirred for 3–5 d at the same temperature. After complete conversion as indicated by TLC, the reaction was quenched with trimethylamine. The solvent was removed in vacuo and the mixture was purified by column chromatography on silica gel to afford the desired silyl ether 3. (S)-6-((tert-Butyldimethylsilyl)oxy)-2′-methyl-[1,1′-biphenyl]-2-ol [(S)-3a] Yield: 12.6 mg (40%); white solid; [α]D 25 –25.5 (c 0.53, CHCl3. 1H NMR (501 MHz, CD2Cl2): δ = 7.34–7.24 (m, 3 H), 7.16 (dd, J = 7.4, 1.7 Hz, 1 H), 7.12 (t, J = 8.2 Hz, 1 H), 6.60 (dd, J = 8.2, 1.0 Hz, 1 H), 6.50 (dd, J = 8.1, 1.0 Hz, 1 H), 4.75 (s, 1 H), 2.12 (s, 3 H), 0.65 (s, 9 H), 0.07 (s, 3 H), –0.06 (s, 3 H). 13C NMR (126 MHz, CD2Cl2): δ = 154.4, 154.0, 139.2, 132.7, 131.5, 130.9, 129.1, 128.8, 126.5, 120.2, 111.7, 108.5, 25.3, 19.8, 18.0, –4.3, –4.6. EI-HRMS: m/z [M]+• calcd for C19H26O2Si: 314.1695; found: 314.1697. HPLC (IA-3, heptane/isopropanol = 95:5, 0.5 mL/min, 298 K, 220 nm): tR1 = 8.6 min, tR2 = 10.8 min; er = 95:5.
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