Question

Tropane nucleus is combination of

• A. Pyrolidine & piperidine
• B. Pyrolidine & pyridine
• C. Pyrolidine & oscine
• D. Piperidine & oscine

Answer 1

The Correct Option is A

The question is related to pharmacognosy and asks about the combination forming the tropane nucleus. The tropane nucleus is a bicyclic organic structure commonly found in alkaloids, such as cocaine and atropine. Let's explore the options to find the correct pair of components that make up the tropane nucleus. 

1. The tropane nucleus is a bicyclic structure composed of a seven-membered ring fused to a five-membered ring. The two rings involved are:
   • Pyrolidine: A simple five-membered nitrogen-containing ring, often found in structural fragments of various alkaloids.
   • Piperidine: A six-membered saturated ring with a nitrogen atom, also commonly present in various alkaloid structures.
2. Combining a five-membered pyrolidine and a six-membered piperidine ring forms the bicyclic tropane structure.
3. Let's examine the given options and determine the correct combination:
   • Pyrolidine & piperidine: This matches the description of the tropane nucleus, which is indeed formed by the fusion of these two components.
   • Pyrolidine & pyridine: Pyridine is an aromatic six-membered nitrogen ring, not involved in the typical tropane structure.
   • Pyrolidine & oscine: There is no common reference to "oscine" in this context, indicating that this is not a part of the tropane structure.
   • Piperidine & oscine: Similarly, "oscine" doesn't relate to the known structure of the tropane nucleus.
4. Based on this analysis, the correct answer is the combination of Pyrolidine & piperidine, which aligns with the conventional understanding of the tropane nucleus in pharmacognosy.

Therefore, the correct answer is Pyrolidine & piperidine.