Skip to product details

Chemical product profile

HONGKUN / PRODUCT DIRECTORY

1-Amino-4-cyclopentylpiperazine | CAS 61379-64-4

An N-amino piperazine carrying a cyclopentyl group on the opposite ring nitrogen, used in published rifapentine synthesis. The N–N connection and route-specific nitroso-impurity assessment are distinctive qualification points.

CAS61379-64-4
Molecular formulaC9H19N3
Molecular weight169.27 g/mol

Product overview

The terminal amino group in this compound is attached to a piperazine nitrogen, creating an N–N bond. The other ring nitrogen carries a cyclopentyl group. That combination distinguishes it from ordinary cyclopentylpiperazine and from the methyl-substituted analogue associated with different rifamycin chemistry. Published rifapentine routes use this N-amino functionality to build the required side chain. Incoming-material review should confirm the complete structure, free-base form and chromatographic profile. Process-related evaluation may also require a dedicated test for 1-cyclopentyl-4-nitrosopiperazine. The method, reporting limit and acceptance criterion for that component should be agreed for the selected manufacturing route, separately from the bulk amine assay.

Chemical identity

Chemical name
4-Cyclopentylpiperazin-1-amine
CAS number
61379-64-4
Molecular formula
C9H19N3
Molecular weight
169.27 g/mol

Application context

Rifapentine preparation routes combine 1-amino-4-cyclopentylpiperazine with a rifamycin-derived intermediate to introduce the cyclopentylpiperazinyl-containing side chain. The terminal N-amino group supplies the required nitrogen functionality; the cyclopentyl substituent is part of the side-chain identity.

Analytical studies of rifapentine processing discuss the related N-nitroso cyclopentylpiperazine. A qualification enquiry should therefore identify whether a targeted impurity assessment is required and request a suitably sensitive method. Compare identity, amine content, water and the ordinary related-substance profile alongside any separately specified trace-level result.

Chemistry and synthetic role

The exocyclic amino nitrogen is connected directly to a piperazine nitrogen. The opposite nitrogen bears cyclopentyl, so both the N–N linkage and N-substituent define the precursor.

Quality review

Confirm N-amino connectivity

Distinguish the N–NH2 compound from cyclopentylpiperazine lacking the terminal amino group.

Verify cyclopentyl substitution

Separate the required precursor from other N-alkyl piperazines.

Agree targeted nitroso analysis

Where the route assessment requires it, specify 1-cyclopentyl-4-nitrosopiperazine, method sensitivity and acceptance limit.

Preparing a specification

Specify the free-base N-amino cyclopentylpiperazine, amine-assay basis, water and related piperazines. State targeted nitroso-impurity requirements separately, with the agreed method and reporting limit.

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

Is this ordinary 1-cyclopentylpiperazine?

No. It additionally contains a terminal amino group attached to the other ring nitrogen.

Which rifamycin route is associated with the cyclopentyl group?

Published routes use this precursor for rifapentine side-chain construction.

Does a main-component assay cover the nitroso impurity?

A targeted trace-level test may be needed; agree its sensitivity and limit separately.

Technical sources
  1. 1-Amino-4-cyclopentylpiperazineCatapharma
  2. 4-Cyclopentylpiperazin-1-amineFUJIFILM Wako
  3. Method for obtaining rifapentine with a new crystalline formUS20240199642A1
  4. Method for analyzing impurities generated in rifapentine and synthesis process thereofCN115047122B