Regioselective Reductive Ring Cleavage of 3-Benzyltetrahydro-1,3-oxazines to 3-Dialkylaminopropanols and of 3-Benzyl-3-methyltetrahydro-1,3-oxazinium Iodides to Alkyl 3-Dialkylaminopropyl Ethers - Alberola, Angel; Alvarez, M Angeles; Andrés, Celia; González, Alfonso; Pedrosa, Rafael (Synthesis, 1990)