Abstract
A convenient method for the intermolecular N-arylation of hydrazides
with aryl halides in the presence of a palladium catalyst, a MOP-type
ligand, and Cs2 CO3 is reported. The reaction
gives coupling products in good to excellent yields and has a high
tolerance towards a wide spectrum of functional groups.
Key words
palladium - MOP ligands - aryl halide -
N -aryl hydrazides - N-arylation
References and Notes
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General Procedure: An
oven-dried Schlenk tube was evacuated and backfilled with nitrogen.
The Schlenk tube was charged with [Pd(dba)2 ] (11.4
mg, 2.0 mmol% ), ligand (3.0 mmol%), mono- or
di(t -butoxycarbonyl)hydrazine (1.2
mmol), and base (1.5 mmol), and capped with a rubber septum. The
Schlenk tube was evacuated and backfilled with nitrogen three times.
To the Schlenk tube were added aryl halide (1.0 mmol) and solvent
(4.0 mL). The septum was replaced with a Teflon screw-cap and the
mixture was heated to 100 ˚C with stirring for
20 h. Then reaction mixture was allowed to cool to room
temperature, diluted with ethyl acetate, filtered through Celite,
and concentrated under reduced pressure. The crude material was
purified by column chromatography on silica gel (ethyl acetate-hexanes,
1:1→1:20)