How is 4-Cyclopropyl-1-naphthalenamine hydrochloride (CAS: 1533519-92-4) typically synthesized?

4-Cyclopropyl-1-naphthalenamine hydrochloride can be synthesized through the reaction of 1-naphthalenamine with cyclopropyl bromide in the presence of a base, such as sodium hydride. The yield is generally good, and the product can be purified by recrystallization from an appropriate solvent. The reaction is usually conducted under an inert atmosphere to prevent side reactions.