Synthesis and Thermal Reactivity of Pyrrolidine- and 2-Pyrrolidinone-Fused Cyclic Enediynes

Basab Roy; Amit Basak

doi:10.1055/s-2006-950278

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Synlett 2006(17): 2804-2806
DOI: 10.1055/s-2006-950278

LETTER

Synthesis and Thermal Reactivity of Pyrrolidine- and 2-Pyrrolidinone-Fused Cyclic Enediynes

Basab Roy, Amit Basak*
Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
e-Mail: absk@chem.iitkgp.ernet.in;

Further Information

Publication History

Received 7 June 2006
Publication Date:
09 October 2006 (online)

Abstract
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Abstract

Various bicyclic enediynes containing pyrrolidine and pyrrolidinone moieties were synthesised. Thermal reactivity studies indicated the lowering of the onset temperature for Bergman cyclisation upon fusion of these heterocyclic systems onto the cyclic enediyne.

Key word

enediynes - pyrrolidines - pyrrolidinones - heterocyclic systems - Bergman cyclisation

References and Notes

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12

Spectroscopic Data: All new compounds were characterised by spectroscopic and analytical data. Compound 1: ¹H NMR: δ = 8.23 (2 H, dd, J _o _, _m = 6.9, 1.9 Hz), 8.00 (2 H, dd, J _o _, _m = 6.9, 1.9 Hz), 7.32-7.07 (4 H, m), 4.68, 4.19 (2 H, AB_q, J = 18.8 Hz), 3.78, 3.52 (2 H, AB_q, J = 16.6 Hz), 3.49-3.17 (5 H, m), 2.04-1.85 (4 H, m). ¹³C NMR: δ = 150.0, 143.5, 130.5, 129.8, 128.8, 128.7, 127.9, 126.9, 124.7, 123.9, 90.5, 87.2, 84.0, 82.4, 59.2, 56.0, 50.2, 45.1, 28.2, 23.9. MS (ES+): m/z = 436 [M + H⁺]. Compound 2: ¹H NMR: δ = 8.31 (2 H, dd, J _o _, _m = 7.0, 2.0 Hz), 7.98 (2 H, dd, J _o _, _m = 7.0, 2.0 Hz), 4.62 (2 H, dd, J = 18.6, 6.0 Hz), 4.33 (1 H, m), 4.21 (2 H, dd, J = 18.6,12 Hz), 3.79 (1 H, dd, J = 12.0, 3.4 Hz), 3.44 (1 H, t, J = 2.0 Hz), 2.65-2.37 (2 H, m), 2.27-2.15 (2 H, m). ¹³C NMR: δ = 174.7, 150.3, 143.4, 130.6, 130.2, 128.9, 128.7, 128.4, 125.9, 124.6, 124.4, 87.2, 86.5, 84.9, 83.7, 54.8, 48.0, 38.0, 32.6, 29.4, 22.1. MS (ES+): m/z = 450 [M+ H⁺], 263 [M⁺ - SO₂Ar]. Compound 3: δ = 6.43 (1 H, d, J = 10.8 Hz), 5.88-5.79 (2 H, m), 5.28 (1 H, d, J = 15.6 Hz), 4.51-4.42 (2 H, m), 4.12-4.04 (2 H, m), 3.69-3.41 (2 H, m), 2.25-2.14 (1 H, m), 1.97-1.88 (3 H, m). ¹³C NMR: δ = 121.7, 120.8, 94.7, 93.0, 86.6, 83.4, 67.1, 65.0, 55.5, 54.7, 49.0, 32.0, 30.6, 23.7. MS (ES+): m/z = 170 [M - OH]. Compound 4: ¹H NMR (200 MHz, CDCl₃): δ = 8.41 (2 H, dd, J = 8.8 Hz), 8.07 (2 H, dd, J = 8.8 Hz), 7.28 (H, m), 4.28 (2 H, s), 3.66 (2 H, s). ¹H NMR (200 MHz, DMSO-d ₆): δ = 8.39 (2 H, d), 8.13 (2 H, dd, J = 8.8 Hz), 7.32 (2 H, m), 4.40 (2 H, s), 3.53 (2 H, s). ¹³C NMR (50 MHz, CDCl₃): δ = 150.3, 142.5, 130.7, 128.7, 124.7, 124.6, 85.7, 84.7, 46.3, 40.0. ¹³C NMR (50 MHz, DMSO-d ₆): δ = 150.29, 142.4, 130.5, 129.2, 129.1, 124.9, 104.5, 86.7, 84.9, 45.7. MS (ES+): m/z = 598 [M⁺ + H₂O], 581 [M + H⁺], 394 [M⁺ - SO₂Ar].