摘要:
Disclosed are a transaminase mutant and the use thereof, herein the transaminase mutant has a sequence formed after an amino acid mutation occurs in a sequence as shown in SEQ ID NO: 1, and the site at which the amino acid mutation occurs includes a V242W site. On the basis of transaminase shown in SEQ ID NO: 1, the transaminase mutant undergoes the mutation by means of a site-directed mutation method, thereby the amino acid sequence of the transaminase is changed and changes in protein structure and function are achieved, and then the transaminase with the above mutation site is obtained by means of a directed screening method. The transaminase obtained has relatively high catalytic activity, specific selectivity, wide substrate spectrum and broad industrial prospect.
摘要:
Provided are a transaminase mutant and an application thereof. Compared with an amino acid sequence shown in SEQ ID NO:1, an amino acid sequence of the transaminase mutant includes at least one of the following mutation sites: L166, K149, K146, A168, H73, F133, H82, E24, V194, T294, A295, G235 and F236. The mutant of the present invention has the improved catalytic activity for a transammonization reaction of ketone substrates, and is suitable for industrial production of chiral amines.
摘要:
Disclosed are an etelcalcetide intermediate and a method for synthesizing etelcalcetide. The etelcalcetide intermediate is Fmoc- D -Cys(S-S-(N-Boc)- L -Cys(OtBu))-OH. The method for synthesizing the etelcalcetide includes the following steps: using N -Boc- L -Cqs-OtBu as a starting material to generate a primary product of a formula (A) by means of a substitution reaction, herein R is S-Py or Cl; and performing a coupling reaction on the primary product and Fmoc-D-Cys-OH amino acid to obtain Fmoc-D-Cys(S-S-(N-Boc)-L-Cys(OtBu))-OH. The key intermediate is used for synthesizing the etelcalcetide, which may improve the purity and the yield. It is important that the raw materials for synthesizing the key intermediate are cheap and readily available, and the process is simple.
摘要:
Provided are a continuous post-treatment method and device for a penem compound. The method includes the following steps: S1, performing continuous extraction on a reaction crude product of a penem compound, to obtain an extraction heavy phase and an extraction light phase; S2, performing continuous solid-liquid separation on the extraction heavy phase, to obtain a liquid phase separation product; S3, performing continuous pH adjustment on the liquid phase separation product until a pH value thereof is 6.1-6.3, to obtain pH-adjusted solution; and S4, performing continuous crystallization treatment on the pH-adjusted solution by using a first crystallization solvent, to obtain a penem compound product. The use of the method for the post-treatment of the reaction crude product of the penem compound has the advantages of high treatment speed and high efficiency, and stable material properties and a low deterioration rate during the treatment, and has better control over the yield and purity of a target product.
摘要:
Provided are a ketoreductase mutant and a method for producing chiral alcohol using the ketoreductase mutant. The ketoreductase mutant has a sequence with amino acid mutations in the sequence shown in SEQ ID NO:1. The mutation sites comprise at least one of the following positions: 6th position, 21st position, 42nd position, 58th position, 61st position, 76th position, 87th position, 94th position, 96th position, 108th position, 113th position, 117th position, 144th position, 146th position, 147th position, 149th position, 151st position, 152nd, 156th position, 165th position, 177th position, and 198th position.
摘要:
The disclosure provides a method for preparing nilotinib. The preparation method includes the following steps: performing an aminocarbonylation reaction on a compound A and 3-(4-methyl-1H-imidazole-1-yl)-5-(trifluoromethyl) aniline to obtain an amination product; and performing deprotection treatment of an R group on the amination product to obtain the nilotinib, wherein the compound A has a structure shown in formula I, and in formula I, an R group is selected from benzyl, -COCF 3 , -CHO or -CO 2 R', where an R' group is C 1 ∼C 10 alkyl, C 1 ∼C 3 alkoxy ethyl or C 7 ∼C 19 aralkyl. The preparation method is short in synthesis route and mild in reaction condition. Moreover, with adoption of a special raw material, the preparation method may improve a yield of the nilotinib and simultaneously reduce process cost.
摘要翻译:本公开提供了制备尼罗替尼的方法。 该制备方法包括以下步骤:对化合物A和3-(4-甲基-1H-咪唑-1-基)-5-(三氟甲基)苯胺进行氨基羰基化反应,得到胺化产物; 进行氨基化产物上R基的脱保护处理得到尼罗替尼,其中化合物A具有式I所示结构,式I中R基选自苄基,-COCF 3,-CHO或-CO 2 R ',其中R'基团为C1〜C10烷基,C1〜C3烷氧基乙基或C7〜C19芳烷基。 该制备方法合成路线短,反应条件温和。 而且,通过采用特殊的原料,该制备方法可以提高尼罗替尼的产量,同时降低加工成本。
摘要:
The present invention relates to a preparation method for a chiral intermediate for use in statins, acquired with chloroacetic acid and benzyl alcohol as starting materials via a series of reactions, namely etherification, condensation, substitution, and asymmetric reduction. The preparation method provided in the present invention has a novel route of synthesis, allows an intermediate compound to be introduced conveniently into the chiral center of a glycol via enzyme reduction, and not only is low in costs, but also is reliable in quality. The route of synthesis provided in the present invention uses raw materials of low costs, has an easy to operate process, and provides a final product of great purity and high yield.
摘要:
The invention discloses an ozonization continuous reaction device, comprising a raw material inlet, a raw material distributing device, one or plurality of single reaction tubes, a product outlet and an air vent. The first end of the raw material distributing device is communicated with the raw material inlet; the first end of one or plurality of single reaction tubes is communicated with the second end of the raw material distributing device; the product outlet is communicated with the second end of the single reaction tube; ozone is conveyed to the single reaction tube via the air vent. The ozonization continuous reaction device provided by the invention realizes the large-scale and continuous production of the ozonization reaction on the basis of guaranteeing security; as the single reaction tube is arranged, the ozone amount and the liquid raw material existing in the single reaction tube in unit time become fewer, the reaction security is greatly improved; in addition, the liquid raw material and the ozone are continuously fed into the reaction device, the exhaust gas and the products are continuously discharged from the reaction device, the accumulation of the ozone is prevented, the security is greatly guaranteed, and the production capacity also can be improved to a higher level.