an efficient and practical synthesis of benzazolo[2,1-b]quinazolinones and triazolo[2,1-b]quinazolinones catalyzed by nano-sized ns-c4(dabco-so3h)2)·4cl

In this study, 4,4′-(butane-1,4-diyl)bis(1-sulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium)tetrachloride (ns-c4(dabco-so3h)2)·4cl is used as a nano-sized brönsted acid catalyst for the efficient and preferment synthesis of benzazolo[2,1-b]quinazolinones and triazolo[2,1-b]quinazolinones derivatives. this protocol has many advantages including mild reaction conditions, acceptable reaction times, high yields and easy work-up of the products and reusability of the catalyst.