Regioselective Mannich Reaction of Phenols under High Pressure Using Dichloromethane as C1 Unit
作者:Kiyoshi Matsumoto、Kouta Joho、Seisuke Mimori、Hirokazu Iida、Hiroshi Hamana、Akikazu Kakehi
DOI:10.3987/com-08-s(n)111
日期:——
Regioselectivity in Mannich reaction of 4-, 3-, and 2-substituted phenols with typical heterocyclic amines are investigated under reaction conditions developed by Lis. Phenol and 4-alkyl, and 4-chlorophenols in the title reaction predominantly gave the corresponding 2-(aminometllyl)phenols, while 4-methoxyphenol afforded, in addition to the mono(aminomethyl) phenols, a considerable amount of the bis adducts. Peculiarly enough, 3-methylphenol with amines afforded 3-methyl-4-(aminomethyl) phenols whereas 2-methylphenol produced 2-methyl-6-(aminomethyl)phenols.