alpha-Bromo-o-chlorotoluene → 1-Benzyl-3-[4-(tert-butyl-dimethyl-silanyloxy)-3,5-dimethyl-phenyl]-3-hydroxy-1,3-dihydro-indol-2-one

Participants

Reaction Steps

Using a method similar to Preparation 17 with 3-[4-(tert-butyl-dimethyl-silanyloxy)-3,5-dimethyl-phenyl]-3-hydroxy-1,3-dihydro-indol-2-one (3.83 g, 10 mmol), 2-tert-butylimino-2-diethylamino-1,3-dimethyl-perhydro-1,3,2-diazaphosphorine (3.5 ml, 12 mmol) and 2-chlorobenzyl bromide (1.56 mL, 12 mmol) in acetonitrile/DMF (60 mL/20 mL) gives 5.9 g of a crude yellow gum. Purify by flash chromatography (CH2Cl2 to 10% EtOAc/CH2Cl2) gives 3.84 g (76%) of the title compound as a white solid. Mp 147.1° C. MS (ES): m/z=490 (M+1−H2O); 1H NMR(DMSO-d6): δ7.52 (dd, J=1.7, 1.4 Hz, J=7.7, 7.4 Hz, 1H), 7.37-7.14 (m, 5H), 7.05 (t, J=7.7 Hz, 1H), 6.93 (s, 2H), 6.86 (d, J=7.7 Hz, 1H), 6.73 (s, 1H), 4.96 (abq, 2H), 2.11 (s, 6H), 0.98 (s, 9H), 0.16 (s, 6H).

Provenance & Evidence