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Synlett 2020; 31(14): 1404-1408
DOI: 10.1055/s-0040-1707883
DOI: 10.1055/s-0040-1707883
letter
Formal Synthesis of (±)-Aplykurodinone-1 Based on the Indium-Catalyzed Conia-Ene Reaction
We acknowledge financial support from the National Science Foundation of China (21062088, 21562020) and the Science and Technology Plan Project of Jiangxi Province (No. 20151BBG70028, 20142BBE50006).Further Information
Publication History
Received: 07 February 2020
Accepted after revision: 25 May 2020
Publication Date:
18 June 2020 (online)
Abstract
A concise formal synthesis of (±)-aplykurodinone-1 starting from a commercially available material and based on the indium-catalyzed Conia-ene reaction has been accomplished. The synthesis features a Riley selenium dioxide oxidation, a Krapcho dealkoxycarbonylation, and a ring-closing metathesis approach. The synthetic strategy was also supported by a Saegusa oxidation and a classic Michael 1,4-conjugate addition.
Key words
formal synthesis - aplykurodinone-1 - Conia-ene reaction - Riley oxidation - ring-closing metathesisSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0040-1707883.
- Supporting Information
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References and Notes
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- 13 2-(Trimethylsilyl)ethyl (3aS,7aR)-7a-Methyl-4-methylene-3-oxooctahydro-3aH-indene-3a-carboxylate [(±)-4] A solution of 14 (6.16 g 19.96 mmol) in dry CH2Cl2 (194 mL) was stirred with 4 Å MS (9.98 g) at 0 °C under N2 for 0.5 h. In(OTf)3 (11.2 g, 19.93 mmol) was added and the mixture was stirred for 10 min. The mixture then warmed to r.t. and stirred for 30 min, then filtered through a pad of Celite that was washed with CH2Cl2. The filtrate was concentrated in vacuo, and the oily crude residue was purified by column chromatography [silica gel, PE–EtOAc (40:1)] to give a colorless oil; yield: 5.54 g (90%). 1H NMR (400 MHz, CDCl3): δ = 5.01 (s, 1 H), 4.73 (s, 1 H), 4.33–4.04 (m, 2 H), 2.56–2.42 (m, 1 H), 2.42–2.30 (m, 2 H), 2.27–2.15 (m, 1 H), 2.09–1.95 (m, 1 H), 1.76–1.56 (m, 3 H), 1.56–1.44 (m, 1 H), 1.39 (ddd, J = 12.7, 8.8, 3.8 Hz, 1 H), 1.05 (d, J = 7.2 Hz, 3 H), 1.02–0.92 (m, 2 H), 0.02 (s, 9 H). 13C NMR (101 MHz, CDCl3); δ = 208.98, 167.66, 139.59, 113.24, 68.45, 65.25, 42.94, 33.78, 32.92, 31.73, 28.90, 24.45, 20.87, 16.06, –2.65. HRMS (ESI): m/z [M + H]+ calcd for C17H29O3Si: 309.1841; found: 309.1886.
For general reviews and selected Conia-ene reactions, see: