WO2023112820A1 - Procédé de production d'un composé d'acide boronique - Google Patents

Procédé de production d'un composé d'acide boronique Download PDF

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WO2023112820A1
WO2023112820A1 PCT/JP2022/045263 JP2022045263W WO2023112820A1 WO 2023112820 A1 WO2023112820 A1 WO 2023112820A1 JP 2022045263 W JP2022045263 W JP 2022045263W WO 2023112820 A1 WO2023112820 A1 WO 2023112820A1
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boronic acid
acid compound
particularly limited
appropriately selected
flow path
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PCT/JP2022/045263
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English (en)
Japanese (ja)
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愛一郎 永木
洋祐 芦刈
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株式会社altFlow
株式会社中化学日本総合研究所
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Publication of WO2023112820A1 publication Critical patent/WO2023112820A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
    • C07F5/02—Boron compounds

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  • the present invention relates to a method for producing a boronic acid compound.
  • Patent Document 1 A method for synthesizing a boronic acid compound from an o-dihaloaromatic compound is known (Patent Document 1), but this method requires a reaction at an extremely low temperature of -80°C to -50°C and is simple. It cannot be said that it is a good method.
  • an object of the present invention is to solve the above-mentioned problems in the past and to achieve the following objects. That is, an object of the present invention is to provide a method for efficiently and simply producing a boronic acid compound from t-butyl-p-bromobenzoate.
  • 0.3 M or more of t-butyl-p-bromobenzoate and 0.4 M or more of BuLi are introduced into the first micromixer. and a step 2 of introducing the compound obtained in the step 1 and the boronic acid ester compound into a second micromixer. It has been found that a method for producing a boronic acid compound from t-butyl-p-bromobenzoate can be provided in a very simple manner.
  • Step 1 of introducing 0.3 M or more t-butyl-p-bromobenzoate and 0.4 M or more BuLi into a first micromixer, the compound obtained in step 1, and boron and step 2 of introducing the acid ester compound into a second micromixer.
  • FIG. 1 is a schematic diagram of a flow microreactor used in one example of the production method of the present invention.
  • 2 is a schematic diagram of the microreactor system used in Example 1.
  • FIG. 3 is a schematic diagram of the microreactor system used in Example 2.
  • FIG. 4 is a schematic diagram of the microreactor system used in Example 3.
  • FIG. 1 is a schematic diagram of a flow microreactor used in one example of the production method of the present invention.
  • 2 is a schematic diagram of the microreactor system used in Example 1.
  • FIG. 3 is a schematic diagram of the microreactor system used in Example 2.
  • FIG. 4 is a schematic diagram of the microreactor system used in Example 3.
  • the method for producing the boronic acid compound includes steps 1 and 2, and may further include other steps.
  • the step 1 is a step of introducing 0.3 M or more of t-butyl-p-bromobenzoate and 0.4 M or more of BuLi into the first micromixer.
  • t-butyl-p-bromobenzoate The t-butyl-p-bromobenzoate is also referred to as t-butyl-4-bromobenzoate, tert-butyl-p-bromobenzoate, or tert-butyl-4-bromobenzoate.
  • the lower limit of the concentration of t-butyl-p-bromobenzoate is not particularly limited as long as it is 0.3M or more, and can be appropriately selected according to the purpose.
  • the upper limit of the concentration of t-butyl-p-bromobenzoate is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of suppressing side reactions, it is preferably 0.5M or less.
  • the BuLi is not particularly limited and can be appropriately selected depending on the intended purpose. , or t-BuLi is preferred, n-BuLi or sec-BuLi is more preferred, and sec-BuLi is even more preferred.
  • the nBuLi is also referred to as n-butyllithium or normal butyllithium.
  • the sec-BuLi is also referred to as sec-butyllithium or secondary butyllithium.
  • the t-BuLi is also referred to as t-butyllithium or tertiary-butyllithium.
  • the lower limit of the concentration of BuLi is not particularly limited as long as it is 0.4 M or more, and can be appropriately selected according to the purpose. 0.7M or more is preferable from the point of manufacturing.
  • the upper limit of the BuLi concentration is not particularly limited and can be appropriately selected according to the purpose, but from the viewpoint of suppressing side reactions, it is preferably 2.8 M or less.
  • the lower limit of the concentration of n-BuLi is not particularly limited as long as it is 0.4 M or more, and can be appropriately selected according to the purpose. From the viewpoint of producing an acid compound, it is preferably 1.0M or more, more preferably 1.5M or more, and even more preferably 1.6M or more.
  • the upper limit of the n-BuLi concentration is not particularly limited and can be appropriately selected according to the purpose, but from the viewpoint of suppressing side reactions, it is preferably 2.8 M or less.
  • the lower limit of the concentration of sec-BuLi is not particularly limited as long as it is 0.4 M or more, and can be appropriately selected according to the purpose. 0.7M or more is preferable from the point of manufacturing an acid compound.
  • the upper limit of the concentration of sec-BuLi is not particularly limited and can be appropriately selected depending on the intended purpose.
  • the lower limit of the concentration of the t-butyl-p-bromobenzoate is not particularly limited as long as it is 0.3 M or more, and is appropriately selected according to the purpose. However, from the viewpoint of efficiently producing a boronic acid compound from t-butyl-p-bromobenzoate, it is preferably 0.35M or more, more preferably 0.38M or more.
  • the upper limit of the concentration of the t-butyl-p-bromobenzoate when n-BuLi is used as the BuLi is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of suppression, 0.5 M or less is preferable.
  • the lower limit of the concentration of the t-butyl-p-bromobenzoate is not particularly limited as long as it is 0.3 M or more, and is appropriately selected according to the purpose. be able to.
  • the upper limit of the concentration of the t-butyl-p-bromobenzoate is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of suppression, 0.5 M or less is preferable.
  • the first micromixer is not particularly limited as long as it is a mixing means in a microreactor (hereinafter sometimes referred to as "flow microreactor” or “flow reactor”), and is appropriately selected according to the purpose. It may be a substrate-type micromixer or a pipe joint-type micromixer in the microreactor described below.
  • the microreactor is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include a microreactor provided with mixing means, a flow path, and other means as necessary. .
  • the mixing means and the flow path may be integrated or separated.
  • the mixing means is a means capable of mixing two or more liquids.
  • the flow path is a tube through which liquid can flow.
  • the flow passage is connected with at least one of the mixing means.
  • the flow microreactor By using the flow microreactor, it is possible to shorten the residence time from the generation to the next reaction of a compound with low stability, thereby suppressing side reactions. In addition, since the flow microreactor has excellent cooling efficiency, it is possible to suppress side reactions caused by heat generation in an exothermic reaction.
  • Examples of the mixing means and the flow path of the integrated flow microreactor include a substrate-type micromixer.
  • the substrate-type micromixer is composed of a substrate having passages formed therein or on its surface, and is sometimes referred to as a microchannel.
  • the substrate-type micromixer is not particularly limited and can be appropriately selected according to the purpose. ; the mixer described in the document ““Microreactors” Chapter 3, W. Ehrfeld, V. Hessel, H. Lowe, published by Wiley-VCH Co.”, and the like.
  • the mixing means and the flow path are composed of minute flow paths capable of mixing a plurality of liquids.
  • the substrate-type micromixer has an introduction path other than the flow path, which communicates with the flow path and introduces a plurality of liquids into the flow path. That is, it is preferable that the upstream side of the flow path is branched according to the number of the introduction paths.
  • the number of the introduction channels is not particularly limited, and can be appropriately selected according to the purpose. is preferred. It should be noted that a configuration may be adopted in which one liquid is charged in advance into the flow path and another liquid is introduced through the introduction path.
  • the mixing means is not particularly limited as long as it can mix two or more liquids, and can be appropriately selected according to the purpose. Examples thereof include a pipe joint type micromixer.
  • the pipe joint type micromixer has a channel formed inside and, if necessary, a connection member that connects the channel formed inside and the flow channel.
  • the connection method of the connection member is not particularly limited, and can be appropriately selected from known connection methods according to the purpose. Welding type, flange type, bite type, flare type, mechanical type, and the like are included.
  • an introduction path communicating with the flow path and introducing a plurality of liquids into the flow path is formed inside the pipe joint type micromixer. That is, it is preferable that the upstream side of the flow path is branched according to the number of the introduction paths.
  • the number of the introduction paths is two, for example, a T-shape or a Y-shape can be used as the pipe joint type micromixer, and when the number of the introduction paths is three, can use, for example, a cross shape. It should be noted that a configuration may be adopted in which one liquid is charged in advance into the flow path and another liquid is introduced through the introduction path.
  • the material of the pipe joint type micromixer is not particularly limited, and can be appropriately selected according to requirements such as heat resistance, pressure resistance, solvent resistance, and ease of processing. Titanium, copper, nickel, aluminum, silicon, fluorine resins such as Teflon (registered trademark), PFA (perfluoroalkoxy resin), TFAA (trifluoroacetamide), and the like.
  • YM-1 type mixer and YM-2 type mixer manufactured by Azbil Corporation; mixing tees and tees (T-shaped connector) manufactured by Shimadzu GLC Co., Ltd.
  • Micro High Mixer developed by Toray Engineering; Union Tee manufactured by Swagelok, T-shaped Micro Mixer manufactured by Sanko Seiki Kogyo Co., Ltd.;
  • the method of mixing two or more raw materials in the mixing means is not particularly limited and can be appropriately selected according to the purpose.
  • Examples thereof include laminar flow mixing and turbulent mixing.
  • laminar flow mixing static mixing
  • laminar flow mixing is preferable in terms of more efficient reaction control and heat removal.
  • the flow path in the mixing means is minute, the plurality of liquids introduced into the mixing means naturally tend to flow laminarly, and are diffused and mixed in the direction perpendicular to the flow.
  • a configuration may be adopted in which branch points and confluence points are further provided in the flow path to divide the laminar cross section of the flowing liquid, thereby increasing the mixing speed.
  • the flow rate and the shape of the channel can be changed from laminar to turbulent.
  • the turbulent mixing has the advantage of high mixing efficiency and high mixing speed compared to the laminar mixing.
  • the smaller the inner diameter of the flow path in the mixing means the shorter the diffusion distance of molecules, so the time required for mixing can be shortened and the mixing efficiency can be improved. Furthermore, the smaller the inner diameter of the flow channel, the larger the ratio of the surface area to the volume, making it easier to control the temperature of the liquid, for example, to remove the heat of reaction. On the other hand, if the inner diameter of the flow path is too small, the pressure loss increases when the liquid flows, and the pump used for liquid transfer needs to have a special high pressure resistance, which increases the manufacturing cost. There is in addition, the structure of the micromixer may also be limited due to the limitation of the flow rate of liquid transfer.
  • the lower limit of the average inner diameter of the channel in the mixing means is not particularly limited and can be appropriately selected depending on the purpose. It is preferably 50 ⁇ m or more, more preferably 100 ⁇ m or more, and even more preferably 250 ⁇ m or more, from the viewpoint of removing the heat of reaction and reducing the pressure loss during liquid transfer.
  • the upper limit of the average inner diameter of the channel in the mixing means is not particularly limited and can be appropriately selected depending on the purpose. More preferably, it is 2.5 mm or less.
  • the average inner diameter When the average inner diameter is less than 50 ⁇ m, pressure loss may increase. If the average inner diameter exceeds 4 mm, the surface area per unit volume becomes small, and as a result, rapid mixing and removal of reaction heat may become difficult.
  • the cross-sectional area of the flow channel is not particularly limited and can be appropriately selected according to the purpose . ⁇ 2.1 mm 2 is more preferred, and 190,000 ⁇ m 2 to 1 mm 2 is particularly preferred.
  • the cross-sectional shape of the flow path is not particularly limited, and can be appropriately selected according to the purpose. Examples include circular, rectangular, semicircular, and triangular shapes.
  • the flow path is not particularly limited as long as it is a tube that is connected to at least one of the mixing means and can circulate the liquid, and can be appropriately selected according to the purpose.
  • the configuration such as the material can be appropriately selected according to the desired reaction.
  • the flow path is used, for example, when supplying raw materials to the mixing means. Further, the flow path is used, for example, when supplying the reaction product of two or more substances mixed by the mixing means to the next mixing means. At this time, the reaction may continue to occur within the flow path.
  • a stainless steel tube manufactured by GL Sciences Co., Ltd. (outer diameter 1/16 inch (1.58 mm), inner diameter 250 ⁇ m, 500 ⁇ m and 1,000 ⁇ m can be selected, The tube length can be adjusted by the user).
  • the material of the flow path is not particularly limited, and those exemplified as the material of the mixing means can be suitably used.
  • the lower limit of the average inner diameter of the flow passage (tube precooling unit: cooling line average inner diameter) connected upstream of the mixing means is not particularly limited and can be appropriately selected according to the purpose.
  • the thickness is preferably 50 ⁇ m or more, more preferably 100 ⁇ m or more, even more preferably 250 ⁇ m or more, even more preferably 500 ⁇ m or more, and particularly preferably 1000 ⁇ m or more.
  • the upper limit of the average inner diameter of the flow passage (tube precooling unit: cooling line average inner diameter) connected upstream of the mixing means is not particularly limited and can be appropriately selected depending on the purpose. The following is preferable, 3 mm or less is more preferable, and 2.5 mm or less is even more preferable.
  • the lower limit of the average inner diameter of the flow passage connected downstream of the mixing means is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of reducing pressure loss, it is preferably 50 ⁇ m or more, more preferably 100 ⁇ m or more, and even more preferably 250 ⁇ m or more.
  • the upper limit of the average inner diameter of the flow path (the average inner diameter of the microtube reactor) connected downstream of the mixing means is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 4 mm or less. , 3 mm or less, and more preferably 2.5 mm or less.
  • the lower limit of the flow rate of the liquid in the flow path (the flow path connected upstream of the mixing means) for supplying the raw material (t-butyl-p-bromobenzoate) is not particularly limited, depending on the purpose. Although it can be selected as appropriate, from the viewpoint of efficiently producing a boronic acid compound from t-butyl-p-bromobenzoate, it is preferably 1 mL/min or more, more preferably 2.5 mL/min or more, and 5 mL/min or more. is more preferred, and 6 mL/min or more is particularly preferred.
  • the upper limit of the flow rate of the liquid in the flow path (the flow path connected upstream of the mixing means) for supplying the raw material (t-butyl-p-bromobenzoate) is not particularly limited, depending on the purpose. Although it can be selected as appropriate, it is preferably 100 mL/min or less.
  • the lower limit of the flow rate of the liquid in the flow path (the flow path connected upstream of the mixing means) for supplying the raw material (BuLi) is not particularly limited, and can be appropriately selected according to the purpose. , from the viewpoint of efficiently producing a boronic acid compound from t-butyl-p-bromobenzoate, it is preferably 0.2 mL / min or more, more preferably 0.5 mL / min or more, and further preferably 1 mL / min or more. 0.5 mL/min or more is even more preferred, and 2.5 mL/min or more is particularly preferred.
  • the upper limit of the flow rate of the liquid in the flow path (the flow path connected upstream of the mixing means) for supplying the raw material (BuLi) is not particularly limited, and can be appropriately selected according to the purpose. , preferably 25 mL/min or less.
  • the lower limit of the retention time of the reaction liquid in the flow path through which the reaction liquid in step 1 flows is not particularly limited and can be appropriately selected according to the purpose. 0.001 second or more is preferable, and 0.01 second or more is more preferable.
  • the upper limit of the retention time of the reaction solution in the flow path through which the reaction solution flows in step 1 is not particularly limited, and can be appropriately selected according to the purpose. From the viewpoint of producing a boronic acid compound from t-butyl-p-bromobenzoate, it is preferably 10 seconds or less, and further in the following order, 5 seconds or less, 2 seconds or less, 1.5 seconds or less, 1 second or less, 0.5 seconds or less. 5 seconds or less, 0.2 seconds or less, 0.1 seconds or less, 0.05 seconds or less, or 0.02 seconds or less are more preferable.
  • the residence time can be set within the above range by adjusting the length and average inner diameter of the microtube reactor.
  • the lower limit of the length of the flow path connected upstream of the mixing means is not particularly limited and can be appropriately selected depending on the purpose. 100 cm or more is more preferable, and 100 cm or more is particularly preferable.
  • the upper limit of the length of the flow path connected upstream of the mixing means is not particularly limited and can be appropriately selected depending on the purpose. The following is more preferable, and 230 cm or less is particularly preferable.
  • the lower limit of the length of the flow path connected downstream of the mixing means is not particularly limited and can be appropriately selected depending on the purpose. The above is more preferable, 20 cm or more is even more preferable, and 50 cm or more is particularly preferable.
  • the upper limit of the length of the flow path connected downstream of the mixing means is not particularly limited and can be appropriately selected depending on the purpose. The following is more preferable, and 230 cm or less is particularly preferable.
  • the other means are not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include liquid feeding means, temperature control means and the like.
  • the liquid sending means is not particularly limited as long as it can supply various raw materials to the flow path of the flow microreactor, and can be appropriately selected according to the purpose. Examples include a pump.
  • the pump is not particularly limited and can be appropriately selected from those that can be used industrially, but those that do not cause pulsation during liquid transfer are preferable, and examples include plunger pumps, gear pumps, rotary pumps, and diaphragm pumps. etc.
  • the temperature control means is not particularly limited as long as the temperature of the mixing means and the channel of the flow microreactor can be controlled, and can be appropriately selected according to the purpose.
  • the lower limit of the reaction temperature in step 1 is not particularly limited and can be appropriately selected according to the purpose, but from the viewpoint of reducing the cooling load, -40 ° C. or higher is preferable, and -30 ° C. or higher is more preferable. -20°C or higher is more preferred, and -10°C or higher is particularly preferred.
  • the upper limit of the reaction temperature in step 1 is not particularly limited and can be appropriately selected according to the purpose. 10° C. or lower is more preferable, and 5° C. or lower is particularly preferable.
  • the lower limit of the amount of BuLi with respect to the t-butyl-p-bromobenzoate is not particularly limited and can be appropriately selected depending on the purpose. Equivalents or more are preferred, 1.0 molar equivalents or more are more preferred, and 1.1 molar equivalents or more are even more preferred.
  • the upper limit of the amount of BuLi relative to the t-butyl-p-bromobenzoate is not particularly limited and can be appropriately selected depending on the purpose. The following is preferable, 2.0 molar equivalents or less is more preferable, and 1.5 molar equivalents or less is even more preferable.
  • the step 2 is a step of introducing the compound obtained in the step 1 and the boronic acid ester compound into a second micromixer.
  • the compound obtained in step 1 is a compound obtained by mixing the t-butyl-p-bromobenzoate and the BuLi with a first micromixer.
  • Examples of the compound obtained by mixing the t-butyl-p-bromobenzoate and the BuLi in the first micromixer include 4-(t-butoxycarbonyl)phenyllithium.
  • the boronate ester compound is not particularly limited and can be appropriately selected depending on the intended purpose. From the viewpoint of suppressing side reactions, isopropoxyboronic acid pinacol ester or triisopropyl borate is preferable.
  • Second Micro Mixer The second micromixer is as described for the first micromixer above.
  • the lower limit of the residence time of the reaction solution in the flow path through which the reaction solution flows in step 2 is not particularly limited, and can be appropriately selected depending on the purpose. From the viewpoint of producing a boronic acid compound from bromobenzoate, the time is preferably 0.001 seconds or longer, more preferably 0.01 seconds or longer, even more preferably 0.1 seconds or longer, particularly preferably 2 seconds or longer, and most preferably 5 seconds or longer. preferable.
  • the upper limit of the residence time of the reaction solution in the flow path through which the reaction solution flows in step 2 is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of producing a boronic acid compound from bromobenzoate, the time is preferably 30 seconds or less, more preferably 20 seconds or less, and even more preferably 10 seconds or less.
  • the residence time can be set within the above range by adjusting the length and average inner diameter of the microtube reactor.
  • the lower limit of the reaction temperature in step 2 is not particularly limited and can be appropriately selected according to the purpose, but from the viewpoint of reducing the cooling load, -40 ° C. or higher is preferable, and -30 ° C. or higher is more preferable. -20°C or higher is more preferred, and -10°C or higher is particularly preferred.
  • the upper limit of the reaction temperature in step 2 is not particularly limited and can be appropriately selected according to the purpose. 10° C. or lower is more preferable, and 5° C. or lower is particularly preferable.
  • the lower limit of the amount of the boronate compound relative to the compound obtained in the step 1 is not particularly limited and can be appropriately selected depending on the purpose. 0 molar equivalent or more is preferable, 1.1 molar equivalent or more is more preferable, and 1.2 molar equivalent or more is still more preferable.
  • the upper limit of the amount of the boronic acid ester compound relative to the compound obtained in the step 1 is not particularly limited and can be appropriately selected depending on the purpose.
  • the molar equivalent or less is preferable, 2.0 molar equivalent or less is more preferable, and 1.5 molar equivalent or less is even more preferable.
  • the yield of the boronic acid compound in the method for producing the boronic acid compound is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 20% or more, more preferably 30% or more, and 40%. 50% or more is more preferable, 60% or more is particularly preferable, and 70% or more is most preferable.
  • the yield is determined by HPLC analysis as follows.
  • the quenching step after step 2 is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include a method of adding methanol or hydrochloric acid.
  • the boronic acid compound is produced by the method for producing a boronic acid compound described above.
  • FIG. 1 is a schematic diagram showing an example of a flow microreactor.
  • the flow microreactor shown in FIG. 1 comprises two mixing means and five flow channels.
  • the flow path P1 is connected to the mixing means M1.
  • the flow path P2 is connected to the mixing means M1.
  • the flow path P3 is connected to the mixing means M2.
  • the flow path R1 is connected to the mixing means M1 and the mixing means M2.
  • the flow path R1 is also a reaction section.
  • the flow path R2 is connected to the mixing means M2.
  • the flow path R2 is also a reaction section.
  • the t-butyl-p-bromobenzoate is supplied from the flow path P1 to the mixing means M1. BuLi is supplied from the flow path P2 to the mixing means M1. Then, in the mixing means M1, the t-butyl-p-bromobenzoate and the BuLi are mixed, and in the resulting liquid, t-butyl-p-bromobenzoate is lithiated and 4-(t- butoxycarbonyl)phenyllithium.
  • the liquid containing 4-(t-butoxycarbonyl)phenyllithium flowing through the flow path R1 is introduced into the mixing means M2. In the mixing means M2, the liquid is mixed with the boronic acid ester compound supplied from the flow path P3 to produce a boronic acid compound after quenching.
  • Example 1 Reaction in a flow reactor: consideration of temperature
  • Two T-shaped micromixers M1 and M2 Sanko Seiki Kogyo Co., Ltd.
  • two microtube reactors R1 and R2 GL Sciences
  • the flow microreactor system was placed in a cooling bath at T° C., and t-butyl-p-bromobenzoate solution (0.38 M, THF solution, flow rate: 6.0 mL/min, Combi-Blocks) and n-butyllithium solution ( A 1.6 M, hexane solution, flow rate: 1.5 mL/min (Kanto Kagaku Co., Ltd.) was introduced into M1 (250 ⁇ m) with a syringe pump.
  • Example 2 Reaction in flow reactor: study of residence time
  • Two T-shaped micromixers M1 and M2 Sanko Seiki Kogyo Co., Ltd.
  • two microtube reactors R1 and R2 GL Sciences
  • the flow microreactor system was placed in a cooling bath at T° C., and t-butyl-p-bromobenzoate solution (0.38 M, THF solution, flow rate: 6.0 mL/min, Combi-Blocks) and n-butyllithium solution ( A 1.6 M, hexane solution, flow rate: 1.5 mL/min (Kanto Kagaku Co., Ltd.) was introduced into M1 (250 ⁇ m) with a syringe pump.
  • the resulting solution is passed through R1 ( ⁇ 1 ⁇ m, L 1 cm, t R1 sec), and at M2 (250 ⁇ m), triisopropyl borate solution (1.82 M, THF solution, flow rate: 1.5 mL / min Tokyo Kasei Kogyo Co., Ltd.).
  • microtube reactor (R1) It was found that the yield of the boronic acid compound can be improved even at -20°C or higher by shortening the residence time at .
  • the flow microreactor system was placed in a ⁇ 20° C. cooling bath, and t-butyl-p-bromobenzoate solution (C 1 M, THF solution, flow rate: 6.0 mL/min, Combi-Blocks) and sec-butyllithium solution were added.
  • C 1 M t-butyl-p-bromobenzoate solution
  • sec-butyllithium solution t-butyl-p-bromobenzoate solution
  • C 2 M hexane solution, flow rate: V 2 mL/min, Kanto Kagaku Co., Ltd.
  • Embodiments of the present invention include, for example, the following.
  • Step 1 of introducing 0.3 M or more t-butyl-p-bromobenzoate and 0.4 M or more BuLi into a first micromixer, the compound obtained in step 1, and boron and step 2 of introducing the acid ester compound into a second micromixer.
  • ⁇ 2> The method for producing a boronic acid compound according to ⁇ 1>, wherein the step 1 is performed at -20°C or higher.
  • step 3> The method for producing a boronic acid compound according to ⁇ 1> or ⁇ 2>, wherein step 2 is carried out at -20°C or higher.
  • ⁇ 4> The method for producing a boronic acid compound according to any one of ⁇ 1> to ⁇ 3>, wherein in step 1, the introduction rate of the t-butyl-p-bromobenzoate is 6 mL/min or more. be.
  • ⁇ 5> The method for producing a boronic acid compound according to any one of ⁇ 1> to ⁇ 4>, wherein the BuLi is sec-BuLi.
  • ⁇ 6> The method for producing a boronic acid compound according to any one of ⁇ 1> to ⁇ 5>, wherein the first micromixer has an average inner diameter of 250 ⁇ m or more.
  • ⁇ 7> The method for producing a boronic acid compound according to any one of ⁇ 1> to ⁇ 6>, wherein the second micromixer has an average inner diameter of 250 ⁇ m or more.
  • ⁇ 8> The method for producing a boronic acid compound according to any one of ⁇ 1> to ⁇ 7>, wherein the yield of the boronic acid compound is 20% or more.

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Abstract

La présente invention concerne un procédé de production d'un composé d'acide boronique, ledit procédé étant caractérisé en ce qu'il comprend : une étape 1 dans laquelle au moins 0,3 M de t-butyl-p-bromobenzoate et au moins 0,4 M de BuLi sont introduits dans un premier micromélangeur ; et une étape 2 dans laquelle le composé obtenu à l'étape 1 et un composé ester boronique sont introduits dans un second micromélangeur.
PCT/JP2022/045263 2021-12-15 2022-12-08 Procédé de production d'un composé d'acide boronique WO2023112820A1 (fr)

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