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Synlett 2013; 24(2): 193-196
DOI: 10.1055/s-0032-1317843
DOI: 10.1055/s-0032-1317843
letter
Substrate Structural Effects in Yttrium(III)-Catalyzed Hydroamination/Cyclizations of 1,2-Disubstituted and 1,1,2-Trisubstituted Aminoalkenes Terminated by 2-(Phenyl) and 2-(2-Heteroarenyl) Groups
Weitere Informationen
Publikationsverlauf
Received: 03. Oktober 2012
Accepted after revision: 06. November 2012
Publikationsdatum:
12. Dezember 2012 (online)
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Abstract
A series of 2-phenyl- and 2-(2-heteroarenyl)-bearing amines possessing 1,2-disubstituted and 1,1,2-trisubststuted alkenes have been evaluated in intramolecular hydroaminations catalyzed by Y[N(TMS)2]3 (1Y ). Aminoalkenes possessing a terminal 2-(5-trimethylsilyl)thienyl group exhibited substantially enhanced reactivity compared to their 2-(phenyl)-containing counterparts. Cyclization efficiencies imparted by the 2-[(5-trimethylsilyl)furanyl] substituent were comparable or only slightly better than those obtained with the simple the 2-(phenyl) group.
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- Supporting Information
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References and Notes
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- 7a General Cyclization/Hydroamination Procedure: In an argon-filled glove box, Y[N(TMS)2]3 (5.70 mg, 0.010 mmol) and benzene-d 6 (0.5 mL) were added into a J. Young NMR tube equipped with a Teflon screw cap. (E)-2,2,4-Trimethyl-5-[5-(trimethylsilyl)-2-thienyl]pent-4-enylamine (3f; 28 mg, 0.10 mmol) and p-xylene (10 µL) were then added and the reactant mixture was subsequently held at 60 °C in an oil bath for 4 h until cyclization/hydroamination was judged complete (≥95% by 1H NMR integration).
- 7b Synthesis of p-Toluenesulfonamide; 2,4,4-Trimethyl-1-(toluene-4-sulfonyl)-2-[5-(trimethylsilyl)thiophene-2-ylmethyl]tetrahydropyrrole (4fTs): Tetrahydropyrrole 4f was prepared from (E)-2,2,4-trimethyl-5-[5-(trimethylsilyl)-2-thienyl]pent-4-enylamine (3f; 28 mg, 0.10 mmol) by the general hydroamination procedure. The Teflon screw cap was then removed and the crude product was diluted with anhydrous CH2Cl2 (3 mL). TsCl (22 mg, 0.12 mmol) and pyridine (9.70 μL, 0.12 mmol) were added in succession. The reactant mixture was stirred at room temperature for 12 h, then the reactant mixture was diluted with Et2O (10 mL), washed with saturated NaHCO3 (3 mL) and brine (3 mL), and the organic phase was subsequently dried with Na2SO4. Concentration in vacuo followed by flash chromatography on silica gel (hexane–EtOAc, 15:1) afforded 2,4,4-trimethyl-1-(toluene-4-sulfonyl)-2-[5-(trimethylsilyl)thiophene-2-ylmethyl]tetrahydropyrrole (4fTs ; 33.2 mg, 76%). 1H NMR (500 MHz, CDCl3): δ = 7.75 (d, J = 8.0 Hz, 2 H, 2Ar-H), 7.26 (d, J = 8.0 Hz, 2 H, 2Ar-H), 7.07 (d, J = 3.0 Hz, 1 H, Ar-H), 6.98 (d, J = 3.0 Hz, 1 H, Ar-H), 3.57 (d, J = 14.0 Hz, 1 H, CH), 3.29 (d, J = 14.0 Hz, 1 H, CH), 3.06 (d, J =9.5 Hz, 1 H, CH), 2.98 (d, J = 10.0 Hz, 1 H, CH), 2.40 (s, 3 H, ArCH3), 2.15 (d, J = 13.0 Hz, 1 H, CH), 1.51 (s, 3 H, CH3), 1.42 (d, J = 13.5 Hz, 1 H, CH), 0.97 (s, 3 H, CH3), 0.90 (s, 3 H, CH3), 0.27 (s, 9 H, 3 SiCH3); 13C NMR (500 MHz, CDCl3): δ = 145.2, 142.8, 138.4, 133.9, 129.4, 129.3, 127.3, 68.7, 61.8, 52.6, 42.3, 36.2, 27.6, 27.2, 27.1, 21.5, −0.02; IR (film): 2957, 1439, 1342, 1251, 1209, 1154, 1092, 1055, 984, 840, 814, 759, 714, 659, 592, 548 cm−1; HRMS (ESI): m/z [M + H]+ calcd for C22H33NO2S2Si: 436.1816; found: 436.1897.