Acknowledgement
The Institute for Advanced Studies in Basic Sciences (IASBS) is thanked for supporting this work.
Dedicated to Professor Hashem Sharghi on the occasion of his 60th birthday.
Notes
a) Isolated yields.
b) Reactions carried out for 48 h.
c) Reaction mixture decomposed at 120° C
a) All compounds showed IR absorption at 3150–3420 for N-H and 1620–1680 cm−1 for C=O