摘要:
The present invention relates to an improved process for conversion of cyanopyridines to nicotinamides. More particularly the present invention relates to preparation of nicotinamides and isonicotinamides which finds its usage in the preparation of anti-TB drug i.e. isoniazid and as an intermediate of vitamin B12. The present invention also relates to a process for a catalyst useful for the preparation of nicotinamide and isonicotinamide.
摘要:
Nicotinamides and isonicotinamides, used in the preparation of anti-TB drugs i.e. isoniazid and as an intermediate of vitamin B12 are prepared from cyanopyridines and nicotinamides. Catalysts useful for the preparation of nicotinamide and isonicotinamide.
摘要:
The invention provides a process for the manufacture of isonicotinic acid hydrazide(INH) useful in the treatment of tuberculosis. The invention relates to the single step conversion of isonicotinamide by hydrazine hydrate to isonicotinic acid hydrazide (INH) of yield greater than 95% (w/w) and purity more than 99%.
摘要:
The present invention relates to an improved process for conversion of cyanopyridines to nicotinamides. More particularly the present invention relates to preparation of nicotinamides and isonicotinamides which finds its usage in the preparation of anti-TB drug i.e. isoniazid and as an intermediate of vitamin B12. The present invention also relates to a process for a catalyst useful for the preparation of nicotinamide and isonicotinamide.
摘要:
The present invention relates to an improved process for conversion of cyanopyridines to nicotinamides. More particularly the present invention relates to preparation of nicotinamides and isonicotinamides which finds its usage in the preparation of anti-TB drug i.e. isoniazid and as an intermediate of vitamin B12. The present invention also relates to a process for a catalyst useful for the preparation of nicotinamide and isonicotinamide.
摘要:
Fluorinated 1-cyclopropyl-7-(substituted-pyridinyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylic acids of the formula ##STR1## wherein R is hydrogen, R' and R" are hydrogen or fluoro, or other groups and Z is 3- or 4-pyridinyl substituted by alkyl groups or substituted alkyl groups, are superior antibacterial agents. They are prepared via a coupling reaction between the corresponding esters (R=alkyl) having a halo group in the 7-position and a substituted (trialkylstannyl)pyridine.
摘要:
1,3-dihydro-2H-imidazo[4,5-b]pyridin-2-ones having an aryl or heteroaryl group in the 6-position, useful as phosphodiesterase inhibitors, are prepared by reacting a 2-amino-5-(aryl or heteroaryl)pyridine-3-carboxylic acid with diphenylphosphoryl azide. The compounds are of the formula ##STR1## where R.sub.1 and R.sub.3 are hydrogen or lower-alkyl, R.sub.5 is lower-alkyl or fluorinated lower-alkyl, and Ar is 4-or 3-pyridinyl, or N-oxides thereof, or phenyl or substituted phenyl.
摘要:
Shown is the process which comprises heating 4-(2-fluorophenyl)-2,6-dimethyl-3,5-pyridinedicarboxylic acid to produce a mixture of 4-(2-fluorophenyl)-2,6-dimethylpyridine and 2,4-dimethyl-5H-[1]benzopyrano[3,4-c]pyridin-5-one, separating the components of said mixture and nitrating 4-(2-fluorophenyl)-2,6-dimethylpyridine to produce 4-(2-fluoro-5-nitrophenyl)-2,6-dimethylpyridine. Also shown are the 3-step synthesis of 4-(2-fluorophenyl)-2,6-dimethyl-3,5-pyridinedicarboxylic acid from 2-fluorobenzaldehyde and the five step synthesis of 1-ethyl-6-fluoro-1,4-dihydro-7-(2,6-dimethyl-4-pyridinyl)-4-oxo-3-quinolinecarboxylic acid, a highly potent antibacterial agent, starting with 4-(2-fluoro-5-nitrophenyl)-2,6-dimethylpyridine. Other intermediates shown in said five step synthesis include 3-(2,6-dimethyl-4-pyridinyl)-4-fluorobenzeneamine and diethyl 4-fluoro-3-(2,6-dimethyl-4-pyridinyl)anilinomethylenemalonate.
摘要:
3-Q-4-R.sub.2 -5-(2-Q'-5-R.sub.3 -4-thiazolyl)-6-R.sub.1 -2(1H)-pyridinones (I), where R.sub.1 is alkyl having from one to four carbon atoms, R.sub.2 is hydrogen or methyl, R.sub.3 is hydrogen or alkyl having from one to three carbon atoms, Q is amino, carbamyl, carboxy, cyano or hydrogen, and Q' is alkyl having from one to four carbon atoms, amino or R.sub.4 NH where R.sub.4 is alkyl having from one to four carbon atoms, or acid-addition salts thereof where at least one of Q and Q' is amino or Q' is R.sub.4 NH, are useful as cardiotonics (I where Q is amino, cyano or hydrogen) and/or as intermediates (I where Q is cyano, carbamyl or carboxy). Also shown as intermediates are 1,2-dihydro-4-R.sub.2 -5-[R.sub.3 CH(Br)CO]-6-R.sub.1 -2-oxo-3-pyridinecarbonitriles (II), and, also, processes for preparing I and II.