反应详情

A solution of 7.04 g (0.0282 mol) of 1-(4-chlorophenyl)-2-(1H-imidazol-1-yl)-N-methylethanimine N-oxide (1: R1 =4-Cl) [prepared by reacting 2-(1H-imidazol-1-yl)-4'-chloroacetophenone (45.05 g, 0.204 mol), N-methylhydroxylamine hydrochloride (20.93 g, 0.251 mol), and sodium acetate (41.13 g, 0.502 mol) in 550 ml of ethanol] and 3.95 g (0.0334 mol) of allylbenzene (2: R2 =CH2C6H5) in 100 ml toluene is refluxed for 30 hours under a nitrogen atmosphere. Upon cooling to room temperature, the solvent is removed in vacuo. The resulting cis-/trans-diastereomeric mixture of compound 3 (R1 =4-Cl, R2 =CH2C6H5 is flash-chromatographed on neutral silica gel using a 98:2 by volume mixture of chloroform and methanol as eluent to give 3.80 g (36%) of isomer A. Following crystallization from ether a melting point of 118°-120° C. is determined.

1. customthe solvent is removed in vacuo
2. additionThe resulting cis-/trans-diastereomeric mixture of compound 3 (R1 =4-Cl, R2 =CH2C6H5
3. customis flash-chromatographed on neutral silica gel using a 98:2
4. additionby volume mixture of chloroform and methanol as eluent
5. customto give 3.80 g (36%) of isomer A
6. customcrystallization from ether a melting point of 118°-120° C.