Bromocyclobutane → (4S)-4-[2-(Cyclobutylsulfonyl)-4-cyanophenyl]-3,6-dimethyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carbonitrile

Participants

Reaction Conditions

Reaction Steps

Under argon, sodium 5-cyano-2-{(4S)-5-cyano-3,6-dimethyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidin-4-yl}benzenesulfinate (150 mg, 65 μmol; purity about 21%) was suspended in a pressure-proof glass tube in DMF (1 ml). Molecular sieve (4 Å, 20 mg) and bromocyclobutane (100 μl, 1088 μmol, 16.7 eq.) were added. The sealed tube was heated at 115° C. for 15 h. The reaction mixture was then filtered, and the filtrate was concentrated under reduced pressure. The residue was purified by preparative HPLC (Gromsil C18 column; mobile phase: acetonitrile/water+0.1% TFA). After lyophilization, the title compound was obtained as a solid (15.5 mg, purity according to LC-MS 90%, 41% of theory).

Provenance & Evidence