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Synlett 2013; 24(15): 1941-1944
DOI: 10.1055/s-0033-1339472
DOI: 10.1055/s-0033-1339472
letter
Synthetic Study towards Strictamine: The Oxidative Coupling Approach
Further Information
Publication History
Received: 30 May 2013
Accepted after revision: 25 June 2013
Publication Date:
07 August 2013 (online)
Abstract
A synthetic approach featuring a key intramolecular oxidative coupling of a dianion for the formation of the C7–C16 bond was exploited aiming at the synthesis of strictamine. Treatment of substituted tetrahydrocarboline with LHMDS at –78 °C followed by iodine at room temperature afforded a tetracyclic compound, a substructure of eburnane-type alkaloid, via the formation of the Na–C16 bond.
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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- 19 Procedure for the Preparation of Compound 13 To a solution of methyl malonate 9 (48.0 mg, 0.1 mmol) in THF (1.0 mL, 0.1 M) was added dropwise LHMDS (0.22 mL, 1.0 M in THF, 0.22 mmol) at –78 °C. After 10 min, the reaction mixture was warmed to r.t. and a solution of iodine (52.0 mg, 0.2 mmol) in THF (0.2 mL) was added. The reaction was stirred at r.t. for 10 min, and then quenched with Na2S2O3 (aq). The aqueous phase was extracted with EtOAc. The combined organic layers were dried over Na2SO4, and the volatiles were removed in vacuo. The residue was purified by flash column chromatography (CH2Cl2–acetone = 150:1) to yield 13 as a yellow foam (32.0 mg, 69%). IR (neat): 2925, 2854, 1739, 1454, 1229, 1159 cm–1. 1H NMR (400 MHz, CDCl3): δ = 7.73 (d, J = 8.2 Hz, 2 H), 7.38–7.36 (m, 1 H), 7.29 (d, J = 8.2 Hz, 2 H), 7.13–7.07 (m, 3 H), 4.46 (dd, J = 11.8, 4.2 Hz, 1 H), 3.90 (s, 3 H), 3.76 (ddd, J = 13.4, 4.4, 4.4 Hz, 1 H), 3.61 (s, 3 H), 3.50 (ddd, J = 13.4, 8.8, 3.6 Hz, 1 H), 2.94–2.89 (m, 1 H), 2.75–2.69 (m, 1 H), 2.66–2.61 (m, 1 H), 2.51–2.43 (m, 1 H), 2.41 (s, 3 H), 2.39–2.32 (m, 1 H), 2.04–1.94 (m, 1 H). 13C NMR (101 MHz, CDCl3): δ = 169.5, 168.0, 143.8, 137.9, 136.7, 131.7, 130.1, 127.7, 127.3, 122.4, 120.7, 118.3, 112.6, 109.9, 68.4, 53.7, 53.2, 53.1, 44.7, 32.1, 27.4, 21.7, 21.3. ESI-HRMS: m/z [M + H]+ calcd for C25H27N2O6S: 483.1590; found: 483.1598.
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Closing ring E via formation of C6–C7 bond, see:
Closing ring E via formation of C7–C16 bond, see:
Closing ring E via formation of C15–C16 bond, see:
Selected recent examples of oxidative C–N bond formation: