摘要:
Process for the biotechnological preparation of L-thienylalanines in enantiomerically pure form from 2-hydroxy-3-thienylacrylic acids L-Thienylalanines are prepared via the hydantoin or the azlactone route. The starting substances used for the biotransformation are 2-hydroxy-3-thienylacrylic acids. The innovative step consists in the transamination of the enol form of the 2-hydroxy-3-thienylacrylic acids to give L-thienylalanines with the aid of biotransformation. The transaminiation is carried out in the presence of L-aspartic acid or L-glutamic acid as amino donor.
摘要:
Process for the biotechnological preparation of L-thienylalanines in enantiomerically pure form from 2-hydroxy-3-thienylacrylic acids, and their use. L-Thienylalanines are prepared via the hydantoin or the azlactone route. The starting substances used for the biotransformation are 2-hydroxy-3-thienylacrylic acids. The innovative step consists in the transamination of the enol form of the 2-hydroxy-3-thienylacrylic acids to give L-thienylalanines with the aid of biotransformation. The transaminiation is carried out in the presence of L-aspartic acid or L-glutamic acid as amino donor.
摘要:
L-Thienylalanines are prepared via the hydantoin or the azlactone route. The starting substances used for the biotransformation are 2-hydroxy-3-thienylacrylic acids. The innovative step consists in the transamination of the enol form of the 2-hydroxy-3-thienylacrylic acids to give L-thienylalanines with the aid of biotransformation. The transaminiation is carried out in the presence of L-aspartic acid or L-glutamic acid as amino donor.
摘要:
The invention relates to elaiophyline derivatives of the formula I ##STR1## in which R.sup.1 and R.sup.1' are identical or different and represent a radical of the formula II/or III ##STR2## in which R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.7 have the meanings given. The invention furthermore relates to a process for the preparation of these elaiophyline derivatives and also the use of the lattere as medicaments, in particular as anthelmintically acting medicaments.
摘要:
Streptomyces parvullus, DSM 3816, produces on aerobic fermentation new antibiotics which are distinguished by antimicrobial activity even after derivatization.
摘要:
Novel streptenols with pharmacological activity, in particular with HMG-CoA-reductase inhibiting activity, can be isolated from the nutrient broth of streptomycetes. These compounds can also be used as synthesis unit for the production of mevilonin analogues.
摘要:
A process for the stereoselective preparation of 5-substituted .delta.-lactones of the formulae Ia, Ib, Ic and Id ##STR1## in which R.sup.1 is a straight-chain or branched alkyl or alkenyl group or methylhydroxy, novel 5-substituted .delta.-lactones and novel intermediates, and use thereof as pharmaceuticals having cholesterol synthesis-inhibiting action, fragrances and flavorings is described.
摘要:
Streptomyces parvullus, DSM 3816, produces on aerobic fermentation new antibiotics which are distinguished by antimicrobial activity even after derivatization.
摘要:
The compound of the formula ##STR1## in which, independently of one another, R.sup.1 and R.sup.4 are hydrogen or hydroxyl,R.sup.2 and R.sup.3 are hydroxyl,R.sup.5 is hydrogen, hydroxyl or an oxo group, andR.sup.2 and R.sup.3, and R.sup.3 and R.sup.4, can each together form a double bond,has hypolipemic properties and is used for the preparation of a pharmaceutical for lowering serum cholesterol.
摘要:
It is possible to prepare the demalonyl compound of macrolide lactones by hydrolysis in the presence of a base without a retro-aldol cleavage occurring.