2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione: Properties & Uses
2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione: Properties & Uses
2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione is a structurally distinctive Meldrum's acid-derived heterocyclic compound that serves as a versatile electrophilic building block in organic synthesis, combining the reactivity of a cyclic vinylogous carbamate with the acidic character of a 1,3-dioxane-4,6-dione scaffold.
- IUPAC Name
- 2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione
- Core Scaffold
- Meldrum's acid (1,3-dioxane-4,6-dione) with a pyrrolidin-2-ylidene substituent at C-5
- Functional Class
- Cyclic vinylogous amide / electrophilic heterocyclic building block
- Primary Application
- Synthetic intermediate in heterocyclic and medicinal chemistry research
- Aladdin SKU
- D698779
- Storage & Handling
- Handle under standard laboratory conditions; store as directed on product label
Chemical Structure and Key Physicochemical Features
2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione belongs to the family of Meldrum's acid derivatives, a class well-known for their pronounced acidity at the C-5 position and their utility as activated methylene compounds. In this particular derivative, the C-5 position bears a pyrrolidin-2-ylidene moiety, creating an enamine-like conjugated system embedded within the six-membered 1,3-dioxane-4,6-dione ring.
The gem-dimethyl ketal group at C-2 contributes conformational rigidity and electronic stabilization of the dioxane ring, while the endocyclic exocyclic double bond formed between C-5 of the dioxane ring and the pyrrolidine nitrogen-adjacent carbon establishes a push-pull alkene system. This arrangement distributes electron density in a manner that renders the compound highly reactive toward nucleophiles and electrophiles under appropriate conditions.
The compound is expected to be a crystalline solid at room temperature, consistent with related Meldrum's acid derivatives. Precise melting point, solubility parameters, and spectroscopic data (NMR, IR, MS) should be consulted from the Aladdin Scientific product certificate of analysis or primary literature.
Synthesis and Preparation Strategies
Compounds of the type 5-(heteroaryl- or heteroalkylidene)-Meldrum's acid are typically prepared by condensation reactions. For 2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione, the most conceptually straightforward retrosynthetic disconnection places Meldrum's acid (2,2-dimethyl-1,3-dioxane-4,6-dione) and pyrrolidin-2-one (or an equivalent electrophilic two-carbon unit) as the key precursors.
In practice, Knoevenagel-type condensations between Meldrum's acid and carbonyl compounds, or the reaction of Meldrum's acid with iminium ion equivalents generated from lactams, represent established routes to 5-ylidene Meldrum's acid products. The use of activating agents such as phosphorus oxychloride, Vilsmeier-Haack conditions, or strong Brønsted acid catalysts is commonly employed to facilitate imine or enamine formation at the carbonyl alpha position of pyrrolidine-2-one.
Researchers should verify the specific synthetic procedure, yield, and purity data from peer-reviewed sources before adapting this compound into a multi-step sequence. Aladdin Scientific supplies D698779 as a ready-to-use reagent, reducing the need for in-house synthesis and associated quality validation steps.
Research Applications in Organic and Medicinal Chemistry
The push-pull alkene character of 2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione makes it an attractive electrophilic partner in a range of synthetic transformations. Meldrum's acid ylidene derivatives are well-established as dipolarophiles in 1,3-dipolar cycloadditions, as Michael acceptors in conjugate addition reactions, and as precursors to β-amino acid scaffolds upon ring opening and decarboxylation.
In medicinal chemistry, the pyrrolidine ring system is a privileged scaffold frequently encountered in bioactive natural products and drug candidates. Incorporating this bicyclic push-pull system into synthetic routes allows rapid construction of structurally complex pyrrolidine-containing heterocycles, which can be screened for biological activity. The Meldrum's acid portion also serves as a latent dicarboxylate equivalent, enabling further functional group manipulation after the key bond-forming step.
Additionally, 5-ylidene Meldrum's acid derivatives have been explored as fluorescent dyes and optical probes when extended conjugation is present. While this specific pyrrolidinylidene derivative may have more modest conjugation, its electron-acceptor character could be exploited in the design of donor-acceptor fluorophores or as a chromophoric handle in biological imaging probe development.
Handling, Safety, and Storage Recommendations
As with all research-grade organic reagents, 2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione should be handled following standard laboratory safety protocols. Researchers should consult the Safety Data Sheet (SDS) provided by Aladdin Scientific for this product (SKU D698779) for authoritative hazard classifications, first-aid measures, and disposal guidance.
General precautions include the use of appropriate personal protective equipment (PPE) such as nitrile gloves, safety goggles, and a laboratory coat. Work in a well-ventilated area or under a fume hood to minimize inhalation exposure. Avoid contact with skin, eyes, and mucous membranes.
For storage, keep the compound in a tightly sealed container away from moisture, heat, and direct light. Storage at room temperature under inert atmosphere is recommended for most Meldrum's acid derivatives to prevent hydrolysis or decomposition. Consult the product label and SDS for any specific temperature or atmosphere requirements unique to this compound.
Frequently asked questions
What type of reactions is 2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione most commonly used for?
This compound is primarily used as an electrophilic building block in reactions exploiting its push-pull alkene system. Applications include Michael addition reactions (where it acts as a Michael acceptor), 1,3-dipolar cycloadditions as a dipolarophile, and Knoevenagel-type condensations. The Meldrum's acid scaffold can subsequently be opened and decarboxylated to deliver β-amino acid or other carboxylate-containing fragments.
How should I store Aladdin SKU D698779 to maintain its integrity?
Store the compound in a tightly sealed container, protected from moisture, heat, and light. For Meldrum's acid derivatives in general, storage under inert atmosphere at room temperature or slightly cooler is advisable. Always refer to the official Aladdin Scientific product label and Safety Data Sheet for the most specific and authoritative storage conditions for D698779.
Is 2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione soluble in common organic solvents?
Based on its structural analogy to other Meldrum's acid derivatives, this compound is expected to show reasonable solubility in polar aprotic solvents such as DMSO, DMF, and acetonitrile, and moderate solubility in chlorinated solvents such as DCM. Solubility in water is expected to be low. Researchers should perform small-scale solubility tests and consult the product SDS or certificate of analysis for verified solubility data.
Can this compound be used as a fluorescent probe precursor?
Certain 5-ylidene Meldrum's acid derivatives with extended pi-conjugation have been reported as fluorescent dyes or optical probes. For this pyrrolidinylidene derivative, the degree of conjugation is more limited compared to fully aromatic analogues; however, its electron-acceptor character may still be exploited in donor-acceptor fluorophore design. Experimental validation is required to confirm any fluorescence properties.
References
- Chen, B.-C. Meldrum's acid in organic synthesis. Heterocycles 1991, 32, 529–597.
- Trost, B. M.; Brindle, C. S. The direct catalytic asymmetric aldol reaction. Chem. Soc. Rev. 2010, 39, 1600–1632.
- Aladdin Scientific. Product page for 2,2-Dimethyl-5-(pyrrolidin-2-ylidene)-1,3-dioxane-4,6-dione, SKU D698779. Aladdin-e.com.
Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
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