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Synlett 2023; 34(13): 1573-1576
DOI: 10.1055/a-2030-6797
DOI: 10.1055/a-2030-6797
letter
Special Edition Thieme Chemistry Journals Awardees 2022
Synthesis of 2‑Boryl Allylboronates by a Bimetallic Platinum/Zinc-Promoted Diborylation of Propargylic Amines
We are grateful for financial support from the Guangdong Basic and Applied Basic Research Foundation (2020A1515110437), the National Natural Science Foundation of China (22171236), the Recruitment Program of Global Experts, and the Fundamental Research Funds for the Central Universities (20720210012).
Abstract
2‑Boryl allylboronates, which contain both a C(sp2)–B bond and a C(sp3)–B bond, are attractive synthetic intermediates due to their diverse reactivity profiles toward a wide range of organic transformations. We report a facile approach to (Z)-2‑boryl allylboronates through a Pt/Zn-promoted diborylation reaction of readily available propargylic amines. An array of valuable (Z)-2‑boryl allylboronates were obtained in up to 73% yield in the presence of 2.5 mol% of Pt(PPh3)4 and 50 mol% of ZnBr2.
Key words
2-boryl allylboronates - propargylic amines - platinum catalysis - bimetallic synergistic effect - diborylationSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2030-6797.
- Supporting Information
Publication History
Received: 26 November 2022
Accepted after revision: 08 February 2023
Accepted Manuscript online:
08 February 2023
Article published online:
01 March 2023
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- 10 Product 2a; Typical Procedure In a glovebox, a Young Schlenk tube (10 mL) was charged with Pt(PPh3)4 (6.2 mg, 0.005 mmol, 2.5 mol%), ZnBr2 (22.5 mg, 0.1 mmol, 0.5 equiv), compound 1a (70.6 mg, 0.2 mmol, 1.0 equiv), B2pin2 (76.2 mg, 0.3 mmol, 1.5 equiv), and toluene (2.0 mL). The tube was then sealed and transferred out of the glove box. The mixture was stirred at 110 °C until the reaction was complete (TLC), then cooled to rt. The solvents were evaporated under reduced pressure to give a crude mixture that was purified by flash column chromatography [silica gel, PE–EtOAc (100:1)] to give a white solid; yield: 51.5 mg (63%); mp 77.0–79.0 °C. IR (thin film): 2977, 2929, 2869, 1371, 1348, 1309, 1143, 967, 700 cm–1. 1H NMR (400 MHz, CDCl3): δ = 7.39–7.29 (m, 5 H), 7.25–7.18 (m, 1 H), 2.55 (dd, J = 8.7, 6.5 Hz, 1 H), 1.69–1.59 (m, 2 H), 1.37–1.26 (m, 24 H), 1.26–1.16 (m, 1 H), 1.10–0.98 (m, 1 H), 0.72 (t, J = 7.3 Hz, 3 H). 13C NMR (100 MHz, CDCl3): δ = 141.0, 138.5, 129.0, 127.7, 126.5, 83.2, 82.9, 32.1, 25.0, 24.8, 24.6, 24.4, 22.1, 13.9. 11B NMR (128 MHz, CDCl3): δ = 31.1. HRMS (ESI): m/z [M + H]+ calcd for C24H39B2O4: 413.3037; found: 413.3047.