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-BUTYL2R-4-AMINOFHENYL)ETHYL-2-HYDROXY-2-PYRIDIN-3-YLETHYLCARBAMINIC ESTER, NOVEL DERIVATIVES OF T-BUTYL2R-4-AMINOPHENYL)ETHYL-2-(TERT-BUTYLODIMETHYLSILANYLOXY)-2-PYRIDIN-3-YLETHYLCARBAMINIC ESTER, 2R-4-AMINOPYHENYL)ETHYL-2-(TERT-BUTYLODIMETHYLSILANYLOXY)-2-(6-CHLOROPYRIDIN-3-YL)ETHYL--2-(NITROPHENYL)ETHYLCARBAMINIC ESTER AND NOVEL DERIVATIVES OF 3-{1-TERT-BUTYLODIMETHYLSILANYLOXY)-2-2--(NITROPHENYL)ETHYLAMINOETHYL}PYRIDINE

摘要

A process for preparing a compound of the formula CHEM wherein n, R1, R2, R3 and X are as defined above, used as an intermediate in the synthesis of beta -adrenergic receptor agonists.