Triphenylphosphine → Methyl 2-[3-(2-(carbazol-9-yl)ethoxy)phenylthio]isobutyrate

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The title product was prepared according to the procedure described in Method B starting from methyl 2-(3-hydroxyphenylthio)iso-butyrate (prepared as described in example 1) (0.609 g, 2.7 mmol), 9H-carbazol-9-ethanol (0.570 g, 2.7 mmol), DIAD (0.708 g, 3.5 mmol), and triphenylphosphine (0.917 g, 3.5 mmol) added piecemeal in small portions, keeping the temperature below 30° C., in 14 mL of anhydrous THF. The reaction was left under magnetic stirring for 18 hours at room temperature. After this period, the solvent was evaporated and the residue purified by silica gel chromatography using hexane/AcOEt 9/1 as eluent. 0.510 g of product were obtained (yield: 45%); Mp: 101-103° C.; TLC: silica gel, eluent hexane/AcOEt 8/2, Fr: 0.38; 1H NMR (CDCl3, 300 MHz) δ: 8.05 (d, 2H), 7.50 (m, 4H), 7.15 (m, 2H), 7.08 (t, 1H), 7.00 (d, 1H), 6.90 (s, 1H), 6.80 (m, 1H), 4.75 (t, 2H), 4.35 (t, 2H), 3.60 (s, 3H), 1.40 (s, 6H); HPLC: Column: Symmetry—C18, (5 μm) 4.6×150 mm, T: room temperature, mobile phase CH3CN/H2O 65/35 (v/v), pH: as is, flow rate: 0.80 mL/min, 205 nm UV detector, retention time 11.45 min; E.A. conforming for C25H25NO3S.

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