Iodine → HCID 136343397, compound

Participants

Reaction Conditions

Reaction Steps

To a 25 mL round bottom flask was added polymer supported triphenylphosphine (687 mg, 2.06 mmol, 2.0 equiv., approx. 3 mmol/g) and 10.3 mL of methylene chloride. The reaction was cooled to 0° C. using an ice-water bath and then iodine (523 mg, 2.06 mmol, 2.0 equiv.) was added followed by TEA (0.57 mL, 4.12 mmol, 4.0 equiv.). After stirring for 5 min, 4-(tert-butyldimethylsilyloxy)-N′-((2R,3R)-3-(tert-butyldimethylsilyloxy)-2-(3-chloro-4-cyano-2-methylphenylamino)butanoyl)-3-chloro benzohydrazide (688 mg, 1.03 mmol, 1.0 equiv.) was added. The reaction was allowed to stir at room temperature for 2 h. The mixture was filtered over Celite® in a ground glass fitted funnel and the solids rinsed with methylene chloride several times. The organics were washed with 10% Na2S2O3 (3×10 mL) followed by a wash with brine (1×10 mL). The solution was dried over Na2SO4 and was concentrated in vacuo to yield a brown oil. The product was purified via automated flash chromatography (0→30% EtOAc/hexanes 100% EtOAc, 40 g of silica gel) to provide the desired product as a yellow oil (586 mg, 88% yield). Other data: 1H NMR (400 MHz, acetone-d6, δ in ppm) 7.92 (d, J=2.14 Hz, 1H), 7.80 (dd, J=1.95, 8.4 Hz, 1H), 7.50 (d, J=8.79 Hz, 1H), 7.18 (d, J=8.6 Hz, 1H), 6.93 (d, J=8.79 Hz, 1H), 5.79 (d, J=9.18 Hz, 1H), 5.02 (dd, J=6.65, 9.19 Hz, 1H), 4.65 (m, 1H), 2.34 (s, 3H), 1.41 (d, J=6.05 Hz, 3H), 0.81 (s, 9H), 0.09 (s, 3H), 0.03 (s, 3H); LRMS (ESI−) exact mass calcd for C25H30Cl2N4O3Si [M]+ 533.5, found 534.2.

Provenance & Evidence