tert-Butyl 6-Oxodecahydro-2H-pyrazino[1,2-a][1,4]diazocine-2-carboxylate TCI B6820

TCI B6820 is tert-Butyl 6-Oxodecahydro-2H-pyrazino[1,2-a][1,4]diazocine-2-carboxylate, a heterocyclic building block built on a fused bicyclic framework that combines a saturated pyrazine ring with an eight-membered diazocine ring. Large saturated scaffolds of this kind are relatively uncommon as ready-to-use starting materials, so having one on the shelf saves researchers a considerable number of synthetic steps when they need a molecular core with a particular spatial volume. In the laboratory, this compound serves as a foundation scaffold that already carries both a lactam group and Boc protection, ready to be carried into a sequence of derivatisation reactions aimed at constructing more complex target molecules.

The principal property that makes this material attractive is that its framework is fully saturated throughout, giving it a high sp3 carbon content and a well-defined three-dimensional shape. The eight-membered ring provides conformational flexibility that differs markedly from that of five- or six-membered rings, and this characteristic is frequently exploited to reach functional group orientations that smaller scaffolds simply cannot access. The lactam group contributes both a hydrogen bond donor and an acceptor, while the tert-butyl carbamate keeps one nitrogen protected and available for selective deprotection at the appropriate stage of a synthetic route.

In Indonesian laboratories, a building block of this type is typically found in university and institutional research groups working on medicinal chemistry and organic synthesis, where three-dimensional scaffolds are prepared for structure–activity exploration. It is generally ordered in small research quantities rather than bulk, used step by step within a planned reaction sequence, and handled alongside standard anhydrous techniques already established in synthetic chemistry laboratories.

• Medicinal chemistry scaffold development — the saturated three-dimensional core offers an sp3-rich alternative to flat aromatic frameworks commonly used when exploring new chemical space in discovery programmes.
• Selective nitrogen functionalisation — the Boc-protected nitrogen allows one site to remain masked while the other nitrogen positions are derivatised, then removed under standard acidic deprotection conditions.
• Conformational studies of medium rings — the eight-membered diazocine ring provides flexibility distinct from smaller rings, making it useful for probing how ring size affects molecular shape.
• Lactam-directed derivatisation chemistry — the existing lactam carbonyl serves as a handle for reduction, substitution, or hydrogen bonding interactions within multi-step routes toward more elaborate targets.
• Library synthesis of fused bicyclic analogues — the ready-made fused bicyclic framework shortens synthetic routes considerably when preparing a series of related compounds for comparative evaluation.

• Chemical name: tert-Butyl 6-Oxodecahydro-2H-pyrazino[1,2-a][1,4]diazocine-2-carboxylate

Store this building block in its original tightly closed container, kept in a cool, dry place away from direct sunlight, moisture, and sources of ignition. Amber glass or the supplier's original packaging is suitable for maintaining material integrity, and containers should be resealed promptly after each use to limit exposure to atmospheric moisture. Weighing and transfers are best carried out in a fume hood using clean, dry spatulas. Personnel should wear a laboratory coat, safety glasses, and chemical-resistant gloves, and should consult the manufacturer's Safety Data Sheet before first use for specific hazard information, incompatibilities, and disposal requirements.

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