Regioselective Mannich Reaction of Phenols under High Pressure Using Dichloromethane as C1 Unit
摘要:
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.
Eco-Friendly Synthesis of Novel Lariat Ethers via Mannich Reaction under Solventless Conditions
作者:Hashem Sharghi、Reza Khalifeh
DOI:10.3987/com-07-11044
日期:——
An expeditious solventless synthesis of novel lariat ethers using calcium oxide (CaO) via Mannich reaction are herein described. This methodology eliminates the use of excess of solvent during the course of reaction. The reaction time is brought down from hours to minutes (20-30 minutes) along with yield enhancement. The CaO powder can be reused up to three times after simple washing with acetone.