反应详情

A process for preparing a compound of formula (6): ##STR120## characterized in that a compound of formula (1): ##STR121## is reacted with oxalic acid diethyl ester and sodium hydride to produce a compound of formula (2): ##STR122## the resulting compound of formula (2) is reacted with 3-methoxybenzenethiol represented by the formula: ##STR123## to produce a compound of formula (3): ##STR124## the resulting compound of formula (3) is reacted with hydrochloric acid to produce a compound of formula (4): ##STR125## the compound of formula formula (4) is then cyclized to produce a compound of formula (5): ##STR126## and the compound of formula (5) is reacted with methyl iodide in the presence of lithium diisopropylamide to produce the compound of formula (6).