摘要:
The present invention relates to a process for enantioselectively preparing optically active 4-hydroxy-2,6,6-trimethylcyclohex-2-en-1-one derivatives of the formulae (I) or (Ia) and to a process for preparing (3S,3′S)-astaxanthin of the formula (III), comprising the process for preparing the compound of the formula (I).
摘要:
The present invention relates to a novel enzymatically catalyzed method for the production of asymmetric aromatic aldehydes in an aqueous reaction medium containing certain organic co-solvents.
摘要:
A process for preparing optically active saturated aldehydes or alcohols of the formula (2) from α,β-unsaturated aldehydes of the formula (1) by reduction in the presence of an enoate reductase (i) having the polypeptide sequence SEQ ID No. 1 or 2, or (ii) having a polypeptide sequence which is at least 80% identical to the sequence of SEQ ID No. 1 or 2.
摘要翻译:通过在具有多肽序列SEQ ID No.的烯酸还原酶(i)的存在下还原从式(1)的α,β-不饱和醛制备式(2)的旋光性饱和醛或醇的方法。 1或2,或(ii)具有与SEQ ID No.1或2的序列至少80%相同的多肽序列。
摘要:
A process for preparing optically active 2-methylalkan-1-ol of the general formula (III) comprising the following steps: (i) carbonyl-selective reduction of 2-methylalk-2-en-1-al of the general formula (I) to 2-methylalk-2-en-1-ol of the general formula (II), (ii) enantioselective hydrogenation of 2-methylalk-2-en-1-ol to the general formula (iii), (iii) increasing the optical yield of the optically active 2-methylalkan-1-ol (III) obtained in step (ii) by a lipase-catalyzed acylation reaction, where the radical R means C1-C10-alkyl.
摘要:
A method for enzymatic preparation of compounds of the general formula (2) from unsaturated alkene derivatives of the general formula (1) by reducing a compound of the formula (1) in the presence of a reductase, comprising at least one of the polypeptide sequences SEQ ID NO: 1, 2 or 3 or having a functionally equivalent polypeptide sequence which is at least 80% identical to SEQ ID NO: 1, 2 or 3.
摘要翻译:一种通过在还原酶的存在下还原式(1)的化合物,从通式(1)的不饱和烯烃衍生物中酶制备通式(2)的化合物的方法,所述方法包括至少一种多肽序列 具有与SEQ ID NO:1,2或3至少80%相同的功能等同多肽序列的SEQ ID NO:1,2或3。
摘要:
The invention relates to a lipase variant which can be prepared by carrying out, on the amino acid sequence of a starting lipase selected from the lipase homologous family I.1 or I.2, at least one amino acid substitution in those positions which correspond to the positions 17, 29, 30, 52, 86, 117, 122, 160, 163, 167, 265, 266, 286, 289 in the prototype lipase sequence SEQ ID NO: 1.
摘要翻译:本发明涉及脂酶变体,其可通过在选自脂肪酶同源家族I.1或I.2的起始脂肪酶的氨基酸序列上进行至少一个氨基酸取代而制备, 原型脂肪酶序列SEQ ID NO:1中的位置17,29,30,25,66,117,122,160,163,167,265,266,286,289。
摘要:
A process for the racemization of an optically active alpha-hydroxyketone by incubating said alpha-hydroxyketone in the presence of an acetoin racemase of Lactobacillus.
摘要:
The present invention relates to enzymic processes for preparing S-butan-2-ol; and to enzymes for carrying out said processes; to nucleic acid sequences coding for said enzymes, to expression cassettes, vectors and recombinant hosts containing said nucleic acid sequences.
摘要:
The invention relates to a method for producing the optically active alkanols of formula (I), wherein n is an integer of from 0 to 5; Cyc represents an optionally substituted, mononuclear or polynuclear, saturated or unsaturated, carbocylic or heterocyclic ring, and R1 represents halogen, SH, OH, NO2, NR2R3 or NR2R3R4+X−, wherein R2, R3 and R4 independently represent H or a lower alkyl or lower alkoxy group and X− represents a counterion. According to the invention, an enzyme (E) selected from the groups of dehydrogenases, aldehyde reductases and carbonyl reductases is incubated in a medium containing the alkanone of formula (II), wherein n, Cyc and R1 are defined as above, in the presence of reduction equivalents. The compound of formula (II) is enzymatically reduced to the compound of formula (I) and the reduction equivalents consumed during reaction are regenerated by reacting a sacrificial alcohol to the corresponding sacrificial ketone using enzyme (E) and at least partially removing the sacrificial ketone from the reaction medium, and then isolating the product (I) so produced.
摘要翻译:本发明涉及一种制备式(I)的光学活性链烷醇的方法,其中n为0-5的整数; Cyc表示任选取代的单核或多核,饱和或不饱和的碳环或杂环,并且R 1表示卤素,SH,OH,NO 2,NR 2 R 3或NR 2 R 3 R 4 + X - ,其中R 2,R 3和R 4独立地表示H或低级烷基 或低级烷氧基,X-表示抗衡离子。 根据本发明,在含有式(II)的烷酮的培养基中温育选自脱氢酶,醛还原酶和羰基还原酶的酶的酶(E),其中n,R 1和R 1如上定义,在存在下 的还原当量。 将式(II)化合物酶还原成式(I)化合物,并且通过使用酶(E)使牺牲醇与相应的牺牲酮反应,并且至少部分除去牺牲酮来再生反应期间消耗的还原当量 从反应介质中分离出如此制备的产物(I)。
摘要:
The invention relates to a method for the enzymatic reduction of alkyne derivatives of the formula (1), wherein R1 represents H, C1-C6-alkyl, C2-C6-alkenyl, or an optionally substituted carbocyclic or heterocyclic, aromatic or non-aromatic group, R2 represents H, C1-C6-alkyl, C2-C6-alkenyl, by reaction in the presence of special reductases.