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Clinical data
ATC code
CAS Number
PubChem CID
ECHA InfoCard 100.037.512
Chemical and physical data
Formula C14H22N2O3S
Molar mass 298.40 g/mol

Piprozolin (or piprozoline) is a medication for bile therapy.[1][2]


Compared to fenclozic acid, piprozolin shows choleretic rather than antiinflammatory activity. That is, the compound is useful in those conditions where the flow of bile is to be increased.

Piprozolin synthesis:[3] G. Satzinger et al., DE 2414345  (1975 to Goedecke), corresp to U.S. Patent 3,971,794 (1976 to Warner-Lambert).

Condensation of ethyl mercaptoacetate with ethyl cyanoacetate leads to thiazolinone (4); an intermediate such as 3, involving addition of the mercaptide to the nitrile function can reasonably be invoked. M/ethylation with di(m)ethyl sulfate proceeds on nitrogen with the comcomitant shift of the enamine to afford olefin (5). Bromination of the active methylene (6) followed by displacement of halogen by piperidine affords the choleretic piprozolin (7).


  1. ^ Koss, F. W.; Vollmer, K. O.; Herrmann, M. (1972). "Research with experimental animals on the mechanism of action of the new choleretic, 3-ethyl-4-oxo-5-piperidino-delta 2, alpha-thiazolidine-acetic acid ethyl ester (Piprozolin)". Archives Internationales de Pharmacodynamie et de Thérapie. 198 (2): 333–346. PMID 5074733. 
  2. ^ Drugs-about.com: Piprozolin
  3. ^ Satzinger, G. (1963). "Substituierte 2-Methylen-thiazolidone-(4)". Justus Liebigs Annalen der Chemie. 665: 150. doi:10.1002/jlac.19636650118.