Piperazine is an organic compound consisting of a six-membered ring containing two nitrogen atoms in opposite positions in the ring. The chemical formula of piperazine is C4H10N2, and it is an important pharmaceutical intermediate. Pyrimidines and piperazines are known to be the backbone of many bulk compounds and important core structures for approved drugs; studies have shown that combining a pyridine ring with a piperazine moiety within a single structural framework enhances biological activity.
Bridged ring compound refers to any two rings in the compound, which share two non-directly connected carbon atoms, and are classified into bicyclic hydrocarbons, tricyclic hydrocarbons, tetracyclic hydrocarbons, etc. Carbon atoms used in two or more rings are bridgehead carbon atoms, and the bond connecting the bridgehead carbon atoms is called a bridge. Bridged ring compounds are a class of organic compounds that are widely present in nature and usually have important physiological activities, such as the famous anticancer drug paclitaxel and antimalarial drug artemisinin.
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