(S)-(+)-2,2-Dimethyl-1,3-dioxolan-4-ylmethyl p-Toluenesulfonate → HCID 68433068, compound

Participants

Reaction Steps

A solution of 6.26 g (20.00 mmol) of 1-[(E)-3-(3,4-dichloro-phenyl)-acryloyl]-[1,4]diazepan-5-one (intermediate 1A]) in 200 ml of THF was treated at 0° C. with 2.47 g (22.00 mmol) of potassium tert-butylate and after 10 min with 5.73 (20.00 mmol) of toluene-4-sulfonic acid (S)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl ester. The reaction was stirred for 14 h at RT, 28 h at reflux temperature, cooled and extracted with aqueous saturated NaHCO3/Et2O (3×). The organic phases were washed with aqueous saturated NaHCO3, aqueous 10% NaCl, dried over Na2SO4 evaporated and purified by flash silica gel column (CH2Cl2/MeOH 97.5/2.5) to yield 4.27 g (50%) of the title compound as off-white powder. MS: 427.1 (MH+, 2Cl).

Provenance & Evidence