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Synthesis method of chiral amine

A synthesis method and technology of chiral amines, applied in the field of chiral amine synthesis, can solve the problems of harsh reaction conditions and high cost

Inactive Publication Date: 2021-03-09
ASYMCHEM LAB TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of synthetic method of chiral amine compound, to solve the problem of high cost and harsh reaction conditions of the synthetic method of chiral amine compound in the prior art

Method used

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  • Synthesis method of chiral amine
  • Synthesis method of chiral amine
  • Synthesis method of chiral amine

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Experimental program
Comparison scheme
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Embodiment 1

[0051] Example 1 Screening of wild-type transaminase

[0052] This embodiment chooses the source and source Chromobaterium violaceum The maternal transaminases belong to the same genus but different species, and the amino acid sequence is more than 82% homologous to the wild-type transaminase (see Table 1 for details) compared with SEQ ID NO: 1, and its catalytic activity was tested. Similar to transaminases, these wild-type transaminase strains catalyze the synthesis of the target bulky substrate (substrate 1) with an efficiency of 0.01% to 1%. The specific results are shown in Table 1.

[0053] Among them, the detailed process of CvTA wild-type transaminase catalyzing substrate 1 is as follows: 1 mL system includes 1 mg substrate 1, 0.1 mg PLP, 1 mg isopropylamine hydrochloride, 50 mg enzyme powder, pH8.0 100 mM phosphate buffer solution, reacted for 40 h.

[0054] The catalytic process of the following other enzymes is the same as above.

[0055] Table 1: Sourced from ...

Embodiment 2

[0060] In addition to transaminases derived from Chromobacterium, the present application also tested transaminases from other sources with 69% to 87% homology to Chromobaterium violaceum. The specific information is listed in Table 2.

[0061] The amino acid sequences between the 54th to 63rd and the 84th to 96th among the wild-type transaminases from different sources in this example also show high conservation. These wild-type transaminases have been tested to show that they also have 0.01%~1% catalytic activity for the target large steric hindrance substrate (substrate 1).

[0062] Table 2: Other transaminases with less homology to Chromobaterium violaceum but derived from different genera.

[0063]

[0064]

[0065] In the above table, + means that the conversion rate is between 0.01% and 0.1%, ++ means that the conversion rate is between 0.1 and 0.5%, and +++ means that the conversion rate is between 0.5 and 1%.

[0066] The different aminotransferase bacterial s...

Embodiment 3

[0068] In order to further confirm that this type of transaminase with the above-mentioned conserved amino acid region affects the catalytic activity of large steric hindrance substrates, the inventors initially Chromobaterium violaceum Conserved amino acid region 1 in the source transaminase (the specific sequence is DGMAGL WC The amino acids W and C in VNVGYGR) were mutated by A. It was found that the catalytic efficiency of substrate 1 was improved after these conservative amino acids were mutated. The conversion rate is improved to between 1~5% (concrete reaction process is recorded in the same embodiment 1).

[0069] In order to confirm that transaminases from other species have the same mutation at the conserved site, the conversion rate of the substrate is improved. The inventors also performed the same mutation on transaminases from other sources. The test results are shown in the table below.

[0070] table 3:

[0071]

[0072] In the above table, ++++ means th...

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Abstract

The invention provides a synthesis method of chiral amine. According to the synthesis method, transaminase is used for performing transamination reaction on a ketone substrate shown as a formula I under the action of an amino donor to obtain a chiral amine compound; in the formula I, the transaminase is transaminase with a conservative amino acid sequence region; the conservative amino acid sequence region at least comprises a region 1 and a region 2; the conservative amino acid sequence of the region 1 is MAGLWCVN; and the conservative amino acid sequence of the region 2 is YNTFFKT. The large-steric-hindrance chiral amine is synthesized by adopting transaminase with a specific conservative amino acid sequence region; the enzyme catalysis reaction volume is small; the synthesis route is short; the product yield is high; high-cost noble metal catalysis is not needed for synthesis conditions; furthermore, three wastes are greatly reduced; and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of synthesis of chiral amines, in particular to a synthesis method of chiral amines. Background technique [0002] Large hindered chiral amine compounds (in this application, refers to a class of compounds whose group next to the potential chiral carbonyl group is larger than the methyl group) is a class of important compounds widely used in the synthesis of optically active substances, functional molecules, drugs and ligands. chiral intermediates. However, there are few reports on the synthesis of such chiral compounds, and satisfactory results cannot be obtained. For example, the heavily hindered phenyl tert-butyl amino ester on the carbonyl side has a selectivity of 76% (Angew. Chem. Int. Ed. 2007, 46, 4367). At present, some metal catalysts, such as ruthenium, rhodium, palladium, etc., have been reported for the asymmetric hydrogenation reaction of small steric hindrance (the group next to the potential chiral c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P13/00
CPCC12P13/001C12P17/12C12P17/14C12N9/1096C12Y206/01C12R2001/01
Inventor 洪浩詹姆斯·盖吉肖毅张娜焦学成马玉磊牟慧艳王祖建孙凯华贾如刘芳刘文敬
Owner ASYMCHEM LAB TIANJIN
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