Iodine → HCID 90412117, compound

Participants

Reaction Steps

To a solution of Example 258B (98 g, 247.2 mmol) in tetrahydrofuran (3528 mL) was added lithium diisopropylamide (1.8M in tetrahydrofuran/heptane/ethylbenzene, 233.4 mL, 420.2 mmol) at −78° C. The mixture was stirred for 20 minutes and a solution of iodine (116.07 g, 457.3 mmol) in tetrahydrofuran (392 mL) was added drop wise over 20 minutes, maintaining the temperature below −70° C. After 30 minutes, the mixture was poured into a saturated ammonium chloride (980 mL) and extracted with ethyl acetate (twice). The combined extracts were washed with saturated sodium thiosulfate (twice) and brine, dried over sodium sulfate, filtered, and concentrated. The residue was purified by flash chromatography on silica gel eluting with 0-11% ethyl acetate in 10% dichloromethane/petroleum ether to afford the title compound.

Provenance & Evidence