申请人:Degussa Aktiengesellschaft
公开号:US04374062A1
公开(公告)日:1983-02-15
There are produced peptides by asymmetrical hydrogenation of dehydropeptides of the general formula ##STR1## in which n is a whole number from 1 to 4, R.sub.1 and R.sub.2 are the same or different, and are hydrogen, a straight or branched chain alkyl group with 1 to 10 carbon atoms, or such a group substituted with a carboxyl group, a phenyl group which is unsubstituted or substituted in the 3 or 4 position or in both the 3 and 4 positions by a hydroxyl, alkoxy, or acyloxy group or an indolyl group which is unsubstituted or substituted in the 6 position by fluorine or chlorine or an indolyl group substituted by a methyl group. R.sub.3 is hydrogen, an alkali metal, or a lower alkyl group with 1 to 4 carbon atoms, R.sub.4 is hydrogen, an acetyl group or a chloroacetyl group and R.sub.5 is hydrogen or a straight or branched chain alkyl group having 1 to 4 carbon atoms with the proviso that when n is 2, 3, or 4, the individual groups R.sub.5 are the same or different, in the presence of chiral rhodium-complexes.
通式为##STR1##的脱氢肽经不对称氢化反应可制得肽,其中n为1至4的整数,R.sub.1和R.sub.2相同或不同,可为氢、链状或支链烷基(含1至10个碳原子)或带有羧基取代的该类基团、未取代或在3或4位或3和4位均被羟基、烷氧基或酰氧基取代的苯基或未取代或在6位被氟或氯取代或被甲基取代的吲哚基,R.sub.3为氢、碱金属或含1至4个碳原子的低级烷基,R.sub.4为氢、乙酰基或氯乙酰基,R.sub.5为氢或含1至4个碳原子的链状或支链烷基,但当n为2、3或4时,各自的R.sub.5基团相同或不同,在手性铑配合物的存在下进行反应。