Enantioselective Diels–Alder Reaction of 3-Nitrocoumarins Promoted by Chiral Organoammonium Salt Catalysts

Yudai Fujii; Ryota Nakao; Saki Sugihara; Keita Fujita; Yuya Araki; Takayuki Kudoh; Ichiro Hayakawa; Haruki Mizoguchi; Akira Sakakura

doi:10.1055/s-0040-1707302

Synlett, Inhaltsverzeichnis

Synlett 2020; 31(20): 2013-2017
DOI: 10.1055/s-0040-1707302

letter

Enantioselective Diels–Alder Reaction of 3-Nitrocoumarins Promoted by Chiral Organoammonium Salt Catalysts

Yudai Fujii

^aGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan eMail: sakakura@okayama-u.ac.jp

,

Ryota Nakao

^aGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan eMail: sakakura@okayama-u.ac.jp

,

Saki Sugihara

^aGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan eMail: sakakura@okayama-u.ac.jp

,

Keita Fujita

^aGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan eMail: sakakura@okayama-u.ac.jp

,

Yuya Araki

^aGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan eMail: sakakura@okayama-u.ac.jp

,

Takayuki Kudoh

^aGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan eMail: sakakura@okayama-u.ac.jp

,

Ichiro Hayakawa

^bGraduate School of Integrated Basic Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan

,

Haruki Mizoguchi

^aGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan eMail: sakakura@okayama-u.ac.jp

,

Akira Sakakura ∗

^aGraduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan eMail: sakakura@okayama-u.ac.jp

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Abstract

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Abstract

An enantioselective Diels–Alder reaction of 3-nitrocoumarins has been developed. A tryptophan-derived C ₁-symmetric organoammonium thiourea catalyst promoted the reaction of 3-nitrocoumarins with Danishefsky’s diene to give the corresponding adducts with good enantioselectivity (up to 94% ee). One of the resulting adducts was converted into a chiral carbocyclic quaternary β-amino alcohol.

Key words

nitrocoumarins - Diels–Alder reaction - asymmetric catalysis - organocatalysis - amino alcohols - Danishefsky’s diene

Volltext

Referenzen

References and Notes
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For recent advances in the use of Danishefsky’s diene in catalytic asymmetric Diels–Alder reactions, see:

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10 See the Supporting Information for details.

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12 Catalyst 5·TFA was prepared in situ by mixing 5 (25 mol%) and TFA (20 mol%) in toluene at rt for 10 min. See also ref. 17.
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15a Li P, Chai Z, Zhao S.-L, Yang Y.-Q, Wang H.-F, Zheng C.-W, Cai Y.-P, Zhao G, Zhu S.-Z. Chem. Commun. 2009; 7369
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16 For further examination of the activities of catalysts 5·HX, see the Supporting Information.
17 Asymmetric Diels–Alder Reaction of 1a with 2 (Table [1], Entry 8); Typical Procedure TFA (2.0 μL, 26 μmol) was added to a solution of 5e (16 mg, 33 μmol) in toluene (2 mL), and the mixture was stirred at rt for 10 min. To this solution was added 1a (25 mg, 0.13 mmol), and the mixture was cooled to –78 °C. Diene 2 (82 μL, 0.33 mmol) was added to the suspension, and the mixture was vigorously stirred at –78 °C for 24 h. The reaction was then quenched by the addition of 1 M aq HCl (5 mL), and the mixture was diluted with Et₂O. The aqueous layer was extracted with Et₂O (×2), and the organic layers were combined, dried (MgSO₄), filtered, and concentrated in vacuo. The residue was purified by column chromatography (silica gel) to give endo-3a (yield: 22 mg, 42%) and exo-3a (yield: 10 mg, 19%). (6aR,7S,10aR)-9-{[tert-Butyl(dimethyl)silyl]oxy}-7-methoxy-6a-nitro-6a,7,10,10a-tetrahydro-6H-benzo[c]chromen-6-one (endo-3a) Colorless oil; [α]_D ²⁴ +178.5 (c 0.65, CHCl₃) (76% ee). IR (film): 1782, 1666, 1564, 1369 cm^–1. ¹H NMR (400 MHz, CDCl₃): δ = 7.33–7.27 (m, 2 H), 7.21–7.15 (m, 1 H), 7.09–7.04 (m, 1 H), 5.23 (ddd, J = 0.8, 1.6, 5.6 Hz, 1 H), 4.86 (d, J = 5.6 Hz, 1 H), 4.22 (dd, J = 7.6, 11.2 Hz, 1 H), 3.37 (s, 3 H), 2.70 (dd, J = 7.6, 18.4 Hz, 1 H), 2.05 (dddd, J = 0.8, 1.6, 11.2, 18.4 Hz, 1 H), 0.89 (s, 9 H), 0.20 (s, 3 H), 0.15 (s, 3 H). ¹³C NMR (100 MHz, CDCl₃): δ = 158.6, 152.1, 149.1, 129.3, 128.0, 125.8, 124.7, 117.5, 100.0, 91.0, 74.7, 57.1, 35.1, 34.3, 25.4 (3 C), 17.9, –4.5, –4.8. HRMS (FAB): m/z [M + H]⁺ calcd for C₂₀H₂₈NO₆Si: 406.1686; found: 406.1712. (6aR,7R,10aR)-9-{[tert-Butyl(dimethyl)silyl]oxy}-7-methoxy-6a-nitro-6a,7,10,10a-tetrahydro-6H-benzo[c]chromen-6-one (exo-3a) Colorless oil; [α]²² _D –17.9 (c 0.40, CHCl₃) (79% ee). IR (film): 1792, 1668, 1558, 1387 cm^–1. ¹H NMR (400 MHz, CDCl₃): δ = 7.36–7.29 (m, 1 H), 7.22–7.13 (m, 2 H), 7.22–7.13 (m, 1 H), 5.02 (dt, J = 1.2, 3.2 Hz, 1 H), 4.87–4.84 (m, 1 H), 4.18 (t, J = 6.0 Hz, 1 H), 3.29 (s, 3 H), 2.49 (d, J = 6.0 Hz, 2 H), 0.91 (s, 9 H), 0.18 (s, 3 H), 0.16 (s, 3 H). ¹³C NMR (150 MHz, CDCl₃): δ = 157.6, 149.9, 149.5, 129.6, 127.9, 125.6, 121.0, 117.3, 101.2, 90.8, 78.9, 59.0, 42.4, 34.0, 25.4, 17.8, –4.6, –4.8. HRMS (FAB): m/z [M + H]⁺ calcd for C₂₀H₂₈NO₆Si: 406.1686; found: 406.1679.
18 3-Nitrocoumarin 1f was recovered (~70%), and no undesired byproducts were obtained.

Corey and co-workers proposed an interaction (π–π interaction or charge-transfer complex formation) between the indolyl group and acrolein derivatives in the transition state of a Diels–Alder reaction catalyzed by a tryptophan-derived chiral Lewis acid, see:

19a Corey EJ, Loh T.-P. J. Am. Chem. Soc. 1991; 113: 8966
19b Corey EJ, Loh T.-P, Roper TD, Azimioara MD, Noe MC. J. Am. Chem. Soc. 1992; 114: 8290

20 Arai T, Wasai M, Yokoyama N. J. Org. Chem. 2011; 76: 2909
21 Purchased from Aldrich (product no. 578002–5G).
22 CCDC 2016403 contains the supplementary crystallographic data for compound 12c. The data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/getstructures.

Zusatzmaterial

Supporting Information