I need some clarification of your starting material and your target product. Your nomenclature is not clear. For instance, in your first sentence you refer to a -3(4H)- heterocycle then in your last sentence you refer to a -4(3H)- heterocycle. You also have a different target product in your last sentence than in your first sentence. CAS registry numbers for your starting material and target product would help...
Unfortunately, I can't obtain ethyl (2-benzyl-6-iodo-4-oxoquinazolin-3(4H)-yl)acetate
please, help me