METHOD OF OBTAINING NOVEL DERIVATIVES OF PYRIDINE, METHOD OF OBTAINING HYDROXY-SUBSTITUTED DERIVATIVES OF PYRIDINE, METHOD OF OBTAINING DERIVATIVES OF OXIRANYLPYRIDINE, NOVEL DERIVATIVES OF 3-(1,2=DIHYDROXYETHYL)PYRIDINE, NOVEL DERIVATIVES OF 2-PYRIDIN-3-YL-2-HYDROXYETHYLENIC ESTER, NOVEL DERIVATIVES OF PYRIDINE, NOVEL DERIVATIVES OF (DI)OXYDIOXATHIOLANYLPYRIDINE, NOVEL DERIVATIVES OF T-BUTYL[2R-4-AMINOFHENYL)ETHYL]-[2-HYDROXY-2-PYRIDIN-3-YLETHYL]CARBAMINIC ESTER, NOVEL DERIVATIVES OF T-BUTYL[2R-4-AMINOPHENYL)ETHYL]-[2-(TERT-BUTYLODIMETHYLSILANYLOXY)-2-PYRIDIN-3-YLETHYL]CARBAMINIC ESTER, [2R-4-AMINOPYHENYL)ETHYL]-[2-(TERT-BUTYLODIMETHYLSILANYLOXY)-2-(6-CHLOROPYRIDIN-3-YL)ETHYL]-[-2-(NITROPHENYL)ETHYL]CARBAMINIC ESTER AND NOVEL DERIVATIVES OF 3-{1-TERT-BUTYLODIMETHYLSILANYLOXY)-2-[[2--(NITROPHENYL)ETHYL]AMINO]ETHYL}PYRIDINE

摘要

A process for preparing a compound of the formula wherein n, R<1>, R<2>, R<3> and X are as defined above, used as an intermediate in the synthesis of beta -adrenergic receptor agonists.