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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Cyclopropanecarboxaldehyde | CAS 1489-69-6

A compact cyclopropyl aldehyde used to introduce cyclopropylmethyl groups through reductive amination, with the intact three-membered ring and aldehyde content defining the required starting-material identity.

CAS1489-69-6
Molecular formulaC4H6O
Molecular weight70.09 g/mol

Product overview

An aldehyde attached directly to cyclopropane provides a short route into cyclopropylmethyl-substituted molecules. Cyclopropanecarboxaldehyde contains only four carbons, but its strained three-membered ring distinguishes it from open-chain aldehydes of the same formula. Published process research uses the reagent in a final reductive amination step for ACT-1004-1239. The formyl carbon becomes the methylene connection to nitrogen in that reaction family. Purchasing should specify CAS 1489-69-6 and distinguish it from cyclopropylacetaldehyde, which has an extra spacer carbon. Qualification should address aldehyde assay, related carbonyl compounds and batch condition, with storage and transport agreed for the actual supplier grade.

Chemical identity

Chemical name
Cyclopropanecarboxaldehyde
CAS number
1489-69-6
Molecular formula
C4H6O
Molecular weight
70.09 g/mol

Application context

A published process-development route for the investigational CXCR7 antagonist ACT-1004-1239 employs cyclopropanecarboxaldehyde in reductive amination after amide coupling and deprotection. This provides a concrete example of its use in installing a cyclopropylmethyl substituent on nitrogen. The reagent is a fragment source in that synthesis, not the investigated active compound itself. For similar transformations, the analytical profile should distinguish the intact-ring aldehyde from other reactive carbonyl components that could generate different alkylated products. Open-chain aldehydes, including crotonaldehyde where relevant to the manufacturing route, merit targeted discussion rather than an assumed universal impurity specification.

Chemistry and synthetic role

The connectivity is cyclopropyl–CHO. Reductive amination can transform CHO into a CH2–N linkage while retaining the ring under an appropriate reaction system.

Quality review

Confirm ring-to-formyl connectivity

Distinguish this four-carbon aldehyde from homologues containing an extra methylene.

Resolve competing aldehydes

Ask whether the method separates route-relevant open-chain carbonyl impurities such as crotonaldehyde when applicable.

Review batch condition and assay

Agree the assay basis and handling instructions for the selected grade, especially for material held before use.

Preparing a specification

Specify CAS 1489-69-6, structural identity, aldehyde assay and relevant carbonyl impurity limits. Agree water criteria where needed and confirm grade-specific storage, transport and retest information.

Packaging and storage

Packaging, closure and net weight are agreed for the selected grade, order quantity and destination. Confirm storage and transport requirements against the actual supplier SDS.

Documentation

Request a batch COA, specification, identity data and SDS. Confirm the availability of the analytical methods and any application-specific impurity results with the proposed supplier.

Procurement questions

What group can it introduce on nitrogen?

Reductive amination can install a cyclopropylmethyl group.

Is it cyclopropylacetaldehyde?

No. The aldehyde carbon is attached directly to the cyclopropane ring.

Is crotonaldehyde always a required test?

Its relevance depends on the proposed manufacturing route and impurity history.

Technical sources
  1. Cyclopropanecarboxaldehyde CID123114PubChem
  2. CyclopropanecarbaldehydeBide / Sigma-Aldrich
  3. Second-generation route for ACT-1004-1239Organic Process Research & Development
  4. N-Cyclopropylmethyl-N-propylamine processSwiss patent