Piprozolin

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

Piprozolin

Clinical data
ATC code	A05AX01 (WHO)
Identifiers
IUPAC name Ethyl (2Z)-2-(3-ethyl-4-oxo-5-piperidin-1-yl-1,3-thiazolidin-2-ylidene)acetate
CAS Number	17243-64-0
PubChem CID	5911905
ChemSpider	4744588 Y
UNII	7786W0VV8M
ChEMBL	ChEMBL2105231
CompTox Dashboard (EPA)	DTXSID70864757
ECHA InfoCard	100.037.512
Chemical and physical data
Formula	C14H22N2O3S
Molar mass	298.40 g·mol−1
InChI InChI=1S/C14H22N2O3S/c1-3-16-11(10-12(17)19-4-2)20-14(13(16)18)15-8-6-5-7-9-15/h10,14H,3-9H2,1-2H3/b11-10- Y Key:UAXYBJSAPFTPNB-KHPPLWFESA-N Y
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Synthesis

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

Piprozolin synthesis:^[3][4][5]

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 concomitant 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).