Malaria remains as one of the most life-threatening diseases and thus major public health concern all around the world. The disease becomes devastating if not treated with proper medication on...
Nucleophilic
ring opening reactions of epoxides with aromatic amines
are in the forefront of the synthetic organic chemistry research to
build new bioactive scaffolds. Here, convenient, green, and highly
efficient regioselective ring opening reactions of sterically hindered
(2
R
,3
S
)-3-(
N
-Boc-amino)-1-oxirane-4-phenylbutane
with various poorly reactive aromatic amines are accomplished under
microwave irradiation in nitromethane. All the reactions effectively
implemented for various aromatic amines involve the reuse of nitromethane
that supports its dual role as a solvent and catalyst. The corresponding
new β-alcohol analogs of hydroxyethylamine (HEA) are isolated
in 41–98% yields. The reactions proceed under mild conditions
for a broad range of less reactive and sterically hindered aromatic
amines. Proton NMR experiments suggest that the nucleophilicity of
amines is influenced by nitromethane, which is substantiated by the
extensive computational studies. Overall, this methodology elucidates
the first-time use of nitromethane as a solvent for the ring opening
reactions under microwave conditions involving an equimolar ratio
of epoxide and aromatic amine without any catalyst, facile ring opening
of complex epoxide by less reactive aromatic amines, low reaction
time, less energy consumption, recycling of the solvent, and simple
workup procedures.
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