摘要:
Crystallized cephalosporin salts, particularly crystalline addition salt of pivaloyloxymethyl 7.beta.-[2-(2-aminothiazol-4-yl)acetamido]-3-[[[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]thio]methyl]ceph-3-em-4-carboxylate with hydrochloric acid, tartaric acid or citric acid, which is very stable and is readily adsorbable through intestinal tract, with little individual differences, when the salt is applied orally.
摘要:
A compound of the formula: ##STR1## wherein R is 2-methylpropyl, 2,2-dimethylpropyl, 1-ethylpropyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, n-pentyl, an alkyl group of 6 or 7 carbon atoms, or an alkenyl group of 2 to 7 carbon atoms, or a pharmaceutically acceptable salt thereof and processes for preparing the same are provided. The compound can orally be applied as antibiotics having improved absorbability.
摘要:
A novel aminothiazoleacetic acid derivative which is an advantageous synthetic intermediate for .beta.-lactam antibiotics, and its production method and use. Starting with diketene, the production method comprises the following squence of steps. ##STR1## (In the above formulas, R is lower alkyl or phenyl; R.sub.1 and R.sub.2 each are hydrogen or lower alkyl; X and X' each are halogen; W is S or SO.sub.2 ; and W' is OH or ##STR2##
摘要:
The present specification relates to an industrially advantageous process for producing vitamin A derivatives which are useful as medicaments, feed additives, food additives and the like. The process provides vitamin A derivatives, particularly all-trans vitamin A derivatives in high yield and purity.
摘要:
There are disclosed a compound of the general formula (I): ##STR1## wherein the group R--CO-- is an acyl group and its production. There is also disclosed a process for producing optically active (.+-.)-(3a.alpha., 4.alpha., 6a.alpha.)-tetrahydro-4-acetoxy-1,3-dibenzyl-1H-thieno[3,4-d]imidazol-2(3H)-one by using the compound (I). The compound (I) can be used as an intermediate for producing D-biotin which is useful as medicaments and feed additives for animals.
摘要:
6-O-(2-keto-L-gulonoyl)-L-ascorbate substantially free from 2-keto-L-gulonic acid is produced by allowing an acid to act on 2-keto-L-gulonic acid in an inert organic solvent and recovering 6-O-(2-keto-L-gulonoyl)-L-ascorbate from the reaction mixture.6-O-(2-keto-L-gulonoyl)-L-ascorbate is more fat-soluble than L-ascorbic acid and is expected of the use as a prodrug for L-ascorbic acid that can be absorbed from the intestinal tract.
摘要:
A novel 2-lower alkyl-4-amino-5-substituted iminopyrimidine compound represented by the formula: ##STR1## wherein R is a lower alkyl, and Y is hydroxyl or amino which may be protected or a salt thereof is obtainable by allowing a formylpyrimidine compound represented by the formula: ##STR2## wherein R is a lower alkyl to react with a compound represented by the formula H.sub.2 N--Y, wherein Y is hydroxyl or amino which may be protected, or a salts thereof. The iminopyrimidine compound gives the known pyrimidine compound represented by the formula: ##STR3## wherein R is as defined above in high yield. Therefor, the process is very useful as an industrial production method.
摘要:
L-ascorbic acid is produced by allowing an acid to act on 2-keto-L-gulonic acid in a mixture solvent of an inert organic solvent and an aliphatic ketone in the presence of water and a surfactant.The method produces L-ascorbic acid in a high yield 90% or more and is an industrially advantageous method.