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Synlett 2014; 25(11): 1521-1524
DOI: 10.1055/s-0033-1341072
DOI: 10.1055/s-0033-1341072
cluster
Reversible Frustrated Lewis Pair Addition of N-Heterocycles to Unsaturated C–C Bonds
Further Information
Publication History
Received: 03 February 2014
Accepted: 05 March 2014
Publication Date:
07 April 2014 (online)
![](https://www.thieme-connect.de/media/synlett/201411/lookinside/thumbnails/10.1055-s-0033-1341072-1.jpg)
Abstract
N-Heterocycle-tethered olefins and alkynes are cyclized by addition of the N-heterocycle and B(C6F5)3 across the unsaturation. This activation is demonstrated to be reversible at high temperatures.
Supporting Information
- for this article is available online at http://www.thieme-connect.com/ejournals/toc/synlett.
- Supporting Information
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References and Notes
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- 23 Representative Procedure for Cyclizations – Synthesis of 2c from 1b In a nitrogen-filled glovebox, alkene 1b (16 mg, 0.1 mmol) was dissolved in toluene (1 mL) and transferred to a vial containing B(C6F5)3 (51 mg, 0.1 mmol). After stirring for 13 h the reaction was concentrated in vacuo, and the resulting precipitate was washed with hexanes (3 mL) to yield the desired cylic product as a white precipitate (61 mg, 90%). 1H NMR (400 MHz, CD2Cl2): δ = 7.99 (t, J = 7.8 Hz, 1 H), 7.52 (d, J = 7.8 Hz, 1 H), 7.43 (d, J = 7.5 Hz, 1 H), 4.66–4.63 (m, 1 H), 3.60–3.52 (m, 1 H), 3.21–3.14 (m, 1 H), 2.63–2.56 (m, 1 H), 2.40–2.32 (m, 1 H), 2.34 (s, 3 H), 2.09–2.01 (m, 1 H), 1.78–1.64 (m, 2 H), 1.34–1.26 (m, 1 H). 13C(1H) NMR (101 MHz, CD2Cl2): δ = 157.82 (s), 154.03 (s), 143.01 (s), 127.88 (s), 127.37 (s), 65.46 (s), 29.08 (s), 27.5 (br s), 25.63 (s), 20.45 (s), 15.53 (s). 19F NMR (377 MHz, CD2Cl2): δ = –131.4 (d, J = 22.1 Hz, o-C6F5), –162.4 (t, J = 20.3 Hz, p-C6F5), –166.1 (q, J = 4.7 Hz, m-C6F5). 11B NMR (128 MHz, CD2Cl2): δ = –14.2 (s).
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