Synlett 2020; 31(11): 1077-1081
DOI: 10.1055/s-0040-1707121
letter
© Georg Thieme Verlag Stuttgart · New York

Copper-Catalyzed Asymmetric Intermolecular N-Monoarylation of Unprotected Sulfonamides via Desymmetrization of Diaryliodonium Salts at Room Temperature

Yan-Li Li
,
Chun Zhang
,
Xiao Jin
,
Xiu-Ling Yu
,
Zhen Wang
,
Hui-Zhen Zhang
,
Wen-Qiang Yang
Financial support from the National Natural Science Foundation of China (Grant 21602095).
Further Information

Publication History

Received: 21 February 2020

Accepted after revision: 26 April 2020

Publication Date:
19 May 2020 (online)


Abstract

A copper-catalyzed asymmetric intermolecular N-monoarylation of weakly nucleophilic sulfonamide by desymmetrization of cyclic diaryliodonium salts has been developed. Chiral copper(II)–diamine ligand complexes catalyzed this intermolecular asymmetric aryl C–N cross-coupling reaction effectively at room temperature to afford a series of N-monoarylsulfonamides in good to excellent yields and enantioselectivities.

Supporting Information

 
  • References and Notes

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    • 9b Ermann M, Riether D, Walker ER, Mushi IF, Jenkins JE, Noya-Marino B, Brewer ML, Taylor MG, Amouzegh P, East SP, Dymock BW, Gemkow MJ, Kahrs AF, Ebneth A, Lobbe S, O'Shea K, Shih DT, Thomson D. Bioorg. Med. Chem. Lett. 2008; 18: 1725
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  • 10 Liu DQ, Sun M, Kord AS. J. Pharm. Biomed. Anal. 2010; 51: 999
  • 16 General Procedure for the Asymmetric Intermolecular N-Arylation of Sulfonamide The diaryliodonium salt 1 (0.25 mmol, 1.0 equiv), sulfonamide 2 (0.30 mmol, 1.2 equiv), catalyst (0.025 mmol, 10 mol%), ligand L1 (0.0375 mmol, 15 mol%), and base (0.5 mmol, 2.0 equiv) were added to a 10 mL oven-dried Schlenk tube, followed by addition of anhydrous 1,2-dichloroethane (1.5 mL) under argon atmosphere. The mixture was stirred at room temperature for 15 h. Then the reaction mixture was poured into water (1.5mL) and extracted with dichloromethane (3 × 5 mL). The combined organic phase dried over anhydrous Na2SO4 and concentrated under reduced pressure. The crude product was purified by flash chromatography (silica gel, petroleum ether/ethyl acetate = 5:1) to give the desired product 3. (S)-Ethyl 3-(2-Iodophenyl)-3-[2-(phenylsulfonamido)phenyl]propanoate (3a) Yield 128.3 mg (96%); white solid, mp 83.4–84.2 °C; [α]D 25 –13.4 (c 0.35, CHCl3, 88% ee). HPLC Chiralpak AD-H (hexane/i-PrOH = 6:4, 1.0 mL/min): τmajor = 14.7 min, τminor = 10.0 min. 1H NMR (400 MHz, CDCl3): δ = 7.84 (d, J = 7.6 Hz, 1 H), 7.75 (d, J = 7.2 Hz, 2 H), 7.54 (d, J = 7.6 Hz, 1 H), 7.46 (t, J = 7.6 Hz, 1 H), 7.36 (t, J = 7.6 Hz, 2 H), 7.23–7.18 (m, 2 H), 7.17–7.10 (m, 2 H), 7.01 (br s, 1 H), 6.96–6.90 (m, 2 H), 4.67 (dd, J = 9.2, 6.0 Hz, 1 H), 4.08–3.99 (m, 2 H), 2.87 (dd, J = 16.0, 6.0 Hz, 1 H), 2.62 (dd, J = 16.4, 9.2 Hz, 1 H), 1.10 (t, J = 7.2 Hz, 3 H). 13C NMR (100 MHz, CDCl3): δ = 171.0, 143.9, 140.3, 140.0, 134.8, 133.4, 132.8, 129.0, 129.0, 128.8, 128.5, 127.9, 127.8, 127.2, 125.6, 123.2, 101.1, 60.9, 45.3, 40.1, 14.1. ESI-MS: m/z = 558.0 [M + Na]+. HRMS (ESI): m/z [M + Na]+ calcd for C23H22INNaO4S: 558.0206; found: 558.0207. (S)-Ethyl 3-(2-Iodophenyl)-3-[2-(2-methylphenylsulfonamido)phenyl]propanoate (3b) Yield 129.0 mg (94%); white solid, mp 82.3–83.2 °C; [α]D 25 –6.5 (c 0.95, CHCl3, 87% ee). HPLC Chiralpak AD-H (hexane/i-PrOH = 7:3, 1.0 mL/min): τmajor = 11.1 min, τminor = 10.3 min. 1H NMR (400 MHz, CDCl3): δ = 7.98 (dd, J = 8.0, 1.2 Hz, 1 H), 7.85 (dd, J = 8.0, 1.2 Hz, 1 H), 7.41 (t, J = 7.6 Hz, 1 H), 7.30–7.25 (m, 3 H), 7.22 (br s, 1 H), 7.20 (dd, J = 8.0, 1.6 Hz, 1 H), 7.15–7.04 (m, 4 H), 6.94 (td, J = 8.0, 1.6 Hz, 1 H), 4.87 (dd, J = 9.6, 6.4 Hz, 1 H), 4.10–4.04 (m, 2 H), 2.95 (dd, J = 16.4, 6.0 Hz, 1 H), 2.75 (dd, J = 16.4, 9.2 Hz, 1 H), 2.58 (s, 3 H), 1.13 (t, J = 7.2 Hz, 3 H). 13C NMR (100 MHz, CDCl3): δ = 171.3, 144.1, 140.3, 139.0, 137.5, 135.1, 132.9, 132.8, 132.7, 129.4, 129.0, 128.7, 128.3, 127.9, 127.7, 126.3, 125.1, 122.1, 101.3, 60.9, 45.2, 40.2, 20.4, 14.0. ESI-MS: m/z 572.0 [M + Na]+. HRMS (ESI): m/z [M + Na]+ calcd for C24H24INNaO4S: 572.0363; found: 572.0363. (S)-Ethyl 3-[2-(3-Bromophenylsulfonamido)phenyl]-3-(2-iodophenyl)propanoate (3c) Yield 118.2 mg (77%); white solid, mp 154.2–154.7 °C; [α]D 25 –6.8 (c 0.31, CHCl3, 86% ee). HPLC Chiralpak AD-H (hexane/i-PrOH = 7:3, 1.0 mL/min): τmajor = 15.8 min, τminor = 10.3 min. 1H NMR (400 MHz, CDCl3): δ = 7.93 (t, J = 1.6 Hz, 1 H),7.85 (d, J = 8.0 Hz, 1 H), 7.63 (d, J = 7.6 Hz, 1 H), 7.55 (t, J = 8.0 Hz, 2 H), 7.25–7.15 (m, 5 H), 7.09 (br s, 1 H), 6.94–6.90 (m, 2 H), 4.63 (dd, J = 10.0, 5.2 Hz, 1 H), 4.10–4.01 (m, 2 H), 2.90 (dd, J = 16.8, 5.6 Hz, 1 H), 2.72 (dd, J = 16.4, 10.0 Hz, 1 H), 1.11 (t, J = 7.2 Hz, 3 H). 13C NMR (100 MHz, CDCl3): δ = 171.1, 143.8, 141.7, 140.4, 135.9, 134.5, 133.6, 130.5, 130.0, 129.1, 128.8, 128.4, 128.1, 128.0, 125.9, 125.7, 123.5, 122.9, 101.0, 61.0, 45.2, 40.1, 14.1. ESI-MS: m/z 635.9 [M + Na]+. HRMS (ESI): m/z [M + Na]+ calcd for C23H21BrINNaO4S: 635.9312; found: 635.9312.