Iodine → HCID 22477267, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridine [54.4 g, Reference Example 9(a)] in dry tetrahydrofuran (1200 mL) cooled to −78° C., was treated with a solution of butyllithium in hexanes (2.5M, 92 mL) over a 20 minute period. The solution was maintained at −78° C. for 30 minutes, then a solution of iodine (101 g) in tetrahydrofuran (600 mL) was added until the iodine colour persisted (ca.300 mL). The mixture was allowed to warm slowly to ambient temperature and the solvent removed under vacuo. The residue was partitioned between ethyl acetate (1000 mL) and water (500 mL) and the water re-extracted with ethyl acetate (2×500 mL). The organic extracts were combined, dried over sodium sulfate and removed under reduced pressure to give a yellow solid which was triturated with diethyl ether to give the title compound (79.6 g) as a pale yellow solid. m.p. 105–107° C.

Provenance & Evidence