Cesium carbonate → 2,5-anhydro-3-deoxy-4-O-(5,8-dichloro-1-oxo-1,2,3,4-tetrahydroisoquinolin-7-yl)-1-O-(4-nitrobenzoyl)-L-threo-pentitol

Participants

Reaction Steps

A solution of ((2R,4S)-4-((methylsulfonyl)oxy)tetrahydrofuran-2-yl)methyl 4-nitrobenzoate (296m, 300 mg, 0.869 mmol), 5,8-dichloro-7-hydroxy-3,4-dihydroisoquinolin-1(2H)-one (296 g, 222 mg, 0.956 mmol), and cesium carbonate (566 mg, 1.74 mmol) in N,N-dimethylformamide (8 mL) was heated to 100° C. for three hours. After cooling to room temperature, the reaction mixture was diluted with ethyl acetate (50 mL), washed with water (2×50 mL) and brine (50 mL), dried over sodium sulfate, concentrated to dryness, and purified by silica gel chromatography (eluting with a gradient of 0-100% ethyl acetate in heptane) to give 2,5-anhydro-3-deoxy-4-O-(5,8-dichloro-1-oxo-1,2,3,4-tetrahydroisoquinolin-7-yl)-1-O-(4-nitrobenzoyl)-L-threo-pentitol (296n, 128 mg, 31% yield) as a solid. 1H NMR (400 MHz, CDCl3) δ 8.18-8.33 (m, 4H), 7.03 (s, 1H), 6.09 (br. s., 1H), 4.99 (td, J=4.28, 1.96 Hz, 1H), 4.56-4.62 (m, 2H), 4.42-4.52 (m, 1H), 4.27 (d, J=10.64 Hz, 1H), 4.02 (dd, J=10.58, 4.34 Hz, 1H), 3.48 (td, J=6.36, 3.91 Hz, 2H), 2.99-3.09 (m, 2H), 2.56 (ddd, J=14.24, 8.19, 6.42 Hz, 1H), 2.18 (dd, J=14.12, 5.07 Hz, 1H). MS: 481 [M+1]

Provenance & Evidence