| http://www.w3.org/ns/prov#value | - The N-lower alkylation of the compounds of the formula (I-1) according to the method (b) can generally be carried out by reacting the compounds with lower alkyl halide, for example, iodomethane, ethyl bromide, propyl bromide and the like, in inert organic solvent, for example, alcohols such as methanol, ethanol and isopropanol; ethers such as dioxane, tetrahydrofuran and dimethoxyethane; aromatic
|
