(S)-4,5,6,7-Tetrahydrobenzothiazole-2,6-diamine

(S)-4,5,6,7-Tetrahydrobenzothiazole-2,6-diamine is the chiral diamine core used in pramipexole synthesis. Its aliphatic 6-amino group allows introduction of the N-propyl side chain, while the 2-amino substituent is retained on the benzothiazole ring. The established S configuration provides the required stereochemical input before completion of the drug-substance framework.

The selected free base is distinct from a racemate and from acid-addition salts of the diamine. It can enter routes that install the side chain through acylation and reduction or through a suitable alkylation sequence. As an unconverted precursor it is also relevant to pramipexole-related impurity analysis. Its unmodified 6-amino group distinguishes residual starting material from side-chain-functionalized products.

Typical Applications

• Pramipexole side-chain construction: Used as the S-configured amine starting fragment in sequences that install an N-propyl group at the saturated-ring amino site.
• Starting-material impurity analysis: Used as the structurally identified precursor in analytical-method development and studies of residual diamine in pramipexole-related samples.

Specifications

Specifications describe the standard grade. Tolerance, test method and documentation package are confirmed per order.