(trans)-3-cyclopropylacrylic acid

(trans)-3-Cyclopropylacrylic acid (CAS: 60129-33-1) is a highly valuable α,β‑unsaturated carboxylic acid building block widely used in organic synthesis, medicinal chemistry, and agrochemical research. Featuring a unique molecular scaffold that combines a conformationally rigid trans‑configureted double bond with a strained cyclopropyl ring, it offers excellent stability, defined stereochemistry, and tunable reactivity for introducing cyclopropyl‑vinyl motifs into complex target molecules. Its primary applications are outlined below:

1. Medicinal Chemistry & Drug Discovery

Key Intermediate for Bioactive Compounds
(trans)-3-Cyclopropylacrylic acid serves as a versatile synthetic precursor for the preparation of enzyme inhibitors, receptor agonists/antagonists, and peptide mimetics. It is commonly used to introduce a cyclopropyl-substituted unsaturated side chain into lead compounds targeting neurological disorders, inflammatory diseases, and metabolic syndromes.

Conformationally Constrained Building Block
The rigid trans‑olefin and the cyclopropane ring restrict rotational freedom, enabling researchers to lock active conformations and improve target binding affinity. This property makes it an invaluable tool in structure‑activity relationship (SAR) studies and for the design of conformationally restricted analogs of natural products or drug candidates.

2. Agrochemical & Crop Protection Research

Synthesis of Herbicides and Fungicides
The cyclopropylacrylic acid motif is found in several crop protection agents. The compound is employed as a starting material or intermediate for the synthesis of cyclopropyl‑containing pyrethroids, auxin transport inhibitors, and strobilurin-like fungicides. Its incorporation often improves metabolic stability and lipophilicity, enhancing foliar uptake and field persistence.

Pheromone and Plant Signal Analogues
Researchers use (trans)-3-cyclopropylacrylic acid to prepare structural mimics of naturally occurring unsaturated fatty acid derivatives and plant signaling molecules (e.g., jasmonate-related compounds), enabling studies on insect behavior, plant defense pathways, and allelopathy.

3. Research & Development Applications

Scaffold Diversification in Library Synthesis
With its well‑defined reactivity in esterification, amidation, Michael addition, and cross‑coupling reactions (e.g., Heck, Suzuki–Miyaura), this compound is a preferred building block for diversity‑oriented synthesis (DOS) and parallel medicinal chemistry. It is routinely used as a core reactant in the construction of compound libraries for phenotypic screening and hit‑to‑lead optimization.

Building Block for Polymer and Materials Chemistry
The acrylic acid functionality allows polymerization or copolymerization with other vinyl monomers, yielding polymers with cyclopropyl side chains. These materials exhibit unique thermal and mechanical properties, making (trans)-3-cyclopropylacrylic acid valuable in the development of specialty coatings, adhesives, and functional resins.

4. Handling & Storage

Storage Conditions
Store as supplied in tightly sealed, dry containers at 2–8 °C, protected from light and moisture. The compound is stable under recommended storage conditions. Extended storage at room temperature should be avoided to prevent potential polymerization.

Intended Use
(trans)-3-Cyclopropylacrylic acid is intended for laboratory research, chemical synthesis, and process development only. It is not for human therapeutic, diagnostic, or food use without appropriate regulatory approval.

Summary

The value of (trans)-3-Cyclopropylacrylic acid lies in its unique combination of a trans‑α,β‑unsaturated carboxylic acid and a rigid cyclopropyl ring, offering defined stereochemistry, predictable reactivity, and enhanced metabolic stability to synthetic targets. These properties make it an indispensable building block for medicinal chemistry, agrochemical innovation, and materials science. Its reliable purity, well‑characterized reactivity, and wide applicability support high‑throughput library synthesis, SAR studies, and lead optimization in both academic and industrial laboratories.

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