Regioselective synthesis of N
(3)
‐ and O‐acylmethyl derivatives of 2‐methylthio‐4(3
H
)‐quinazolinone
摘要:
Abstractmagnified imageReaction of 2‐methylthio‐4(3H)‐quinazolinone with chloroacetone, ω‐bromoacetophenone or ethyl bromoacetate in different solvents (methanol, acetonitrile, dimethylformamide and toluene) using sodium methoxide or potassium carbonate as a base were studied. Regioselective N(3)‐alkylation took place in toluene using potassium carbonate, whereas in dimethylformamide O‐acylmethyl derivatives were obtained. However chloroacetone reacted with 2‐methylthio‐4(3H)‐quinazolinone under various conditions to give a mixture of N(3)/O‐isomers.