(2-Iodoethyl)cyclopropane → 8-Chloro-10-(2-cyclopropylethyl)-10-(trifluoromethyl)-5,10-dihydropyrimido[5,4-b]quinolin-4(3H)-one

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 1-cyclopropyl-2-iodoethane (12.5g, 63.9 mmol, 5 equiv) in anhydrous Et2O (128 mL) at −78° C. was added tert-butyl lithium (1.7M in pentane, 75 mL, 128 mmol, 10 equiv). The resulting white suspension was stirred at −78° C. for 50 min and added via cannula to a suspension of 7 (3.83 g, 12.8 mmol) in THF (64 mL) at −78° C. The resulting dark yellow mixture was stirred at −78° C. for 30 min and then allowed to warm to 0° C. over 5 h. The reaction was quenched with satd. NH4Cl (100 mL) and H2O (100 mL). The reaction mixture was extracted with EtOAc (3×100 mL) and the combined organic layers washed with brine and dried (MgSO4). Chromatography (SiO2, 40 to 50% EtOAc-hexane) provided the desired product as a yellow solid (2.92 g, 62%). ESI HRMS m/z 370.1735 (M++H, C17H16ClF3N3O requires 370.0934).

Provenance & Evidence