Lawesson's reagent → HCID 67006740, compound

Participants

Reaction Steps

To a 25-mL round bottom flask charged with a solution of N′-((2R,3R)-3-(tert-butyldimethylsilyloxy)-2-(3-chloro-4-cyano-2-methylphenylamino)butanoyl)-benzohydrazide (326 mg, 0.65 mmol) in dry THF (10 mL) and equipped with a magnetic stirbar and septum was added Lawesson's reagent (527 mg, 1.3 mmol) under an atmosphere of nitrogen. This was stirred at room temperature for a period of 20 h. The solvent was then blown off under a gentle stream of nitrogen and the residue was directly purified via silica gel chromatography eluted with 30% EtOAc/hexanes to yield the product as a white solid (246 mg, 76%). 1H NMR (500 MHz, CDCl3, δ in ppm) 7.90 (m, 2H), 7.46 (m, 3H), 7.31 (d, J=8.8 Hz, 1H), 6.75 (d, J=8.8 Hz, 1H), 5.19 (d, J=7.9 Hz, 1H), 5.00 (dd, J=3.1, 7.9 Hz, 1H), 4.50 (m, 1H), 2.27 (s, 3H), 1.21 (d, J=6.3 Hz, 3H), 1.02 (s, 9H), 0.24 (s, 3H), 0.17 (s, 3H).

Provenance & Evidence