73963-72-1

Raw materials And Preparation Products

Hazard Information

Material Safety Data Sheet(MSDS)

Questions And Answer

• Pharmacological effects

  Cilostazol is commonly used clinically anti-platelet and anti-clotting drugs. It belongs to a phosphodiesterase inhibitor and can inhibit the activity of phosphodiesterase of platelet and smooth muscle cells, leading to increase of the cAMP concentration in platelets and vascular smooth muscle. It can significantly inhibit the platelet aggregation induced by various kinds of aggregation inducers, and can cause the dissociation of the aggregates. Its major metabolite, epoxide has a three to four fold activity of the prototype drug. It has significant antithrombotic effect on the brain circulation and peripheral circulatory disturbance caused by collagen, ADP, arachidonic acid and sodium laurate. Artery injection of this product can increase the blood flow rate with the strongest effect on the peripheral blood vessels but the weakest effect on the cerebral blood vessels.
  This product is rapidly absorbed in the intestine after oral administration with the Tmax being 3h, PPB being about 95%. Consecutive administration of four days by twice per day caused no increase in the plasma concentration accumulation. It has good tissue distribution with especially high level in the stomach, liver and kidney. At 72h after administration, 42.75% of the administered drug is excreted via urine and 61.7% is subject to fecal excretion. After 48 hour of administration, bile excretion rate is 31.7%. T1/2α is 2.2h and T1/2β is 18h. ;

• Clinical application

  It can be used to alleviate the ischemic symptom such as ulcers, limb pain, cold sensation and intermittent claudication caused by chronic arterial occlusive disease. It can also be applied to the adjuvant treatment of atherosclerosis, arteritis, thromboangiitis obliterans, diabetes-induced ischemia of extremity and takayasu arteritis. Cilostazol also be used as a complementary therapy after surgical treatment to help alleviate the symptoms, improve the circulation and inhibiting thrombosis in transplanted blood vessel. ;

• Side effects

  There may be occasionally rash, hives, itching, palpitations, pulse frequency, low blood pressure, fever, dizziness, dizziness, vertigo, insomnia or drowsiness, swelling, pain, fatigue, weakness, stomach discomfort, nausea, vomiting, loss of appetite, diarrhea, upper abdominal pain, abdominal fullness, increased level of GOT (serum alanine aminotransferase), ALP (serum alkaline phosphatase), LDH (serum lactate dehydrogenase), BUN (blood urea nitrogen), creatinine and uric acid, gastrointestinal bleeding, epistaxis, subcutaneous bleeding, retinal hemorrhage, hematuria, bleeding tendencies and thrombocytopenia.
  The above information is edited by the chemicalbook of Dai Xiongfeng. ;

• Precautions

  Patients of hemophilia, capillary fragility syndrome, upper gastrointestinal bleeding and urinary tract bleeding as well as vitreous hemorrhage should be disabled. Women of pregnancy or possible pregnancy should be disabled.
  This product is should be taken cautious when being applied to patients in the use of anticoagulants (warfarin) or antiplatelet drugs (aspirin, Ticlid) patients. When using cilostazol, the patients should be subject to blood coagulation performance test.
  Women in menstrual period, patients of bleeding tendency or with severe hepatic and renal dysfunction as well as elderly should administer with caution; breast-feeding women should avoid breast-feeding. ;

• Chemical Properties

  It is colorless, needle-like crystals obtained from methanol with the m.p. being 159.4~160.3 ℃ and the UV absorption maximum (methanol) being 257nm (ε15200). It is easily soluble in acetic acid, chloroform, N-methyl-2-pyrrolidone or dimethyl sulfoxide and almost insoluble in ether, water, 0.1mol/L hydrochloric acid or 0.1mol/L sodium hydroxide. ;

• Uses

  It can significantly inhibit the platelet aggregation caused by various inducers and aggregates and can dissociate the aggregates without causing secondary aggregation. It has significant antithrombotic effect on the brain circulation and peripheral circulatory disturbance caused by collagen, ADP, arachidonic acid and sodium laurate. It can also be used for treating ischemic diseases such as chronic arterial occlusive ulcer, pain and coldness. ;

• Production method

  Take 5-chloro-N-cyclohexyl pentanamide as the raw material. Under ice-cooling, to 15 mL of benzene solution containing 1.75g ​​5-chloro-N-cyclohexyl-pentyl amide solution, slowly add 1.9 g of phosphorus pentachloride and stir at room temperature for 1h. At room temperature and stirring, add 1.4mol/L HN3 to 1 mL of the benzene solution. After stirring overnight, continue the reflux for 2h. The solvent was distilled off under reduced pressure with the residue being poured into ice water and subject to chloroform extraction. The extract was successively washed with water, dilute sodium bicarbonate solution and water, further dried by anhydrous sodium sulfate. After the chloroform was distilled off, the residue was subject to isopropanol-water recrystallization to obtain 1.7 g of 5-(4-chlorobutyl)-l-cyclohexyl-tetrazole, being as colorless needle-like crystals with the yield being 87% and the m.p. being 48-49 ℃.
  Dissolve 3.2 g 6-hydroxy-3, 4-dihydrogen-2(1H)-quinolinone and 1.4 g of potassium hydroxide in 20 mL of isopropanol. Under reflux, add drop wise of the isopropanol solution containing 5.7 g of the tetrazole obtained above. Continue stirring and reflux for 4h. Evaporate to dryness with the residue being extracted with chloroform. The extract was washed with l mol/L sodium hydroxide solution, dilute hydrochloric acid and water, dried by anhydrous sodium sulfate. Chloroform was distilled off with the residual liquid being subject to chromatograph on silica gel. Use chloroform-methanol (30: 1) for elution. Then apply methanol-water recrystallization to obtain 6.0 g of colorless needles cilostazol with the yield being 74% and the melting point being 158 ​​~ 159 ℃. ;

Spectrum Detail

Supplier

Related Products