Phenethyl bromide → methyl 4-(phenethylthio)-1H-pyrrole-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of sodium hydroxide (88.0 mg, 2.20 mmol) in degassed H2O (0.500 mL) was added to a mixture of 2-methoxycarbonyl-4-thiocyanopyrrole (0.200 g, 1.10 mmol), prepared according to the procedure described in J. Chem. Soc. Perkin Trans., 2:699 (1990), and (2-bromoethyl)benzene (0.165 mL, 1.21 mmol) in degassed t-BuOH (2.0 mL). The reaction mixture was stirred at 60° C. for 2 h, cooled to rt and concentrated. The residue was dissolved in CH2Cl2 (50 mL) washed with H2O (2×25 mL), dried over anhydrous Na2SO4, concentrated and purified by chromatography on silica gel with MeOH and CH2Cl2 (0-10% gradient) as the mobile phases to afford 0.247 g of the title compound as a light yellow oil: 1H NMR (500 MHz, CDCl3) δ 2.83-2.88 (m, 2 H), 2.89-2.95 (m, 2 H), 3.87 (s, 3 H), 6.94-6.97 (m, 1H), 7.00 (dd, J=2.7, 1.6 Hz, 1 H), 7.14-7.22 (m, 3 H), 7.26-7.30 (m, 2 H), 9.30 (br. s, 1 H); HPLC a) column: PHENOMENEX® Luna 5μ 4.6×50 mm, 4 min gradient, 10% MeOH/90% H2O/0.1% H3PO4 to 90% MeOH/10% H2O/0.1% H3PO4; 1 min hold, 4 mL/min UV detection at 220 nm, 3.561 min retention time, (>95%); HPLC b) column: PHENOMENEX® Luna C18 4.6×50 mm, 4 min gradient, 10% MeOH/90% H2O/0.1% TFA to 90% MeOH/10% H2O/0.1% TFA, 1 min hold; 4 mL/min, UV detection at 220 nm, 3.535 min retention time; MS (ES) 262 [M+H]+.

Provenance & Evidence