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ChemicalBook CAS DataBase List NIPRADILOL
81486-22-8

NIPRADILOL synthesis

8synthesis methods
91520-01-3 Synthesis
3,4-Dihydro-8-methoxy-2H-1-benzopyran-3-ol

91520-01-3
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Yield:-

Steps:

Multi-step reaction with 4 steps
1: 88.9 percent / 47 percent HBr / 9 h / 90 °C
2: 1.) ethyl chloroformate, triethylamine; 2.) Ac2O, fum. HNO3; 3.) NaOH / 1.) THF, 0-5 deg C, 0.5 h; 2.) acetonitrile, -8 deg C, 1 h; 3.) MeOH, H2O, RT, 0.5 h
3: 1 N NaOH / 2 h / 50 °C
4: methanol / 1 h / 70 °C

References:

Shiratsuchi;Kawamura;Akashi;Fujii;Ishihama;Uchida [Chemical and Pharmaceutical Bulletin,1987,vol. 35,# 2,p. 632 - 641]

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