JP2013151484A - Method for producing epinastine by using isourea compound - Google Patents

Method for producing epinastine by using isourea compound Download PDF

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JP2013151484A
JP2013151484A JP2012281125A JP2012281125A JP2013151484A JP 2013151484 A JP2013151484 A JP 2013151484A JP 2012281125 A JP2012281125 A JP 2012281125A JP 2012281125 A JP2012281125 A JP 2012281125A JP 2013151484 A JP2013151484 A JP 2013151484A
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Naoto Inakoshi
直人 稲越
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Towa Pharmaceutical Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a method for producing epinastine via a new intermediate which is safely synthesizable at a low cost.SOLUTION: Epinastine is produced by reacting 5H-dibenz[b, e]azepine-6,11-dihydro-6-methanamine with an N-(iminoalkoxymethyl)carbamic acid ester to synthesize an N-(9,13-dihydro-1H-dibenz[c, f]imidazo[1,5-a]azepin-3-yl)-carbamic acid ester as an intermediate and treating the intermediate with an acid (process A). As an alternative, epinastine is produced by reacting an acid salt of 5H-dibenz[b, e]azepine-6,11-dihydro-6-methanamine with an N-(iminoalkoxymethyl)carbamic acid ester to synthesize an {imino[N-(5H-dibenz[b, e]azepin-6-yl)methylamino]methyl}carbamic acid ester as an intermediate and treating the intermediate with an acid (process B).

Description

本発明は、新規なN−保護エピナスチン化合物、新規なイソウレア付加体、およびそれらの製造方法、並びにエピナスチンおよびその医薬上許容される塩の製造方法に関する。 The present invention relates to a novel N-protected epinastine compound, a novel isourea adduct, and a production method thereof, and a production method of epinastine and a pharmaceutically acceptable salt thereof.

3−アミノ−9,13b−ジヒドロ−1H−ジベンズ−[c,f]−イミダゾ−[1,5−a]−アゼピンとして知られるエピナスチンは、高い抗ヒスタミンおよび抗アレルギー作用を有する医学的有用な化合物である。エピナスチンの製造方法として従来下記の2方法が知られており、特公平3−66311号公報には以下の反応工程が記載されている。 Epinastine, known as 3-amino-9,13b-dihydro-1H-dibenz- [c, f] -imidazo- [1,5-a] -azepine, is medically useful with high antihistamine and antiallergic activity. A compound. Conventionally, the following two methods are known as epinastine production methods, and Japanese Patent Publication No. 3-66311 discloses the following reaction steps.

Figure 2013151484
Figure 2013151484

この反応に用いられるブロモシアンは揮発性が高く、非常に有毒な物質であることが工業的規模での使用における重大な欠点であり、また低収率であることなどにも問題があった。改良法として特開2001−64282号公報(特許第3563643号公報)には、以下に示すブロモシアンを用いない製法が開示されている。 Bromocyan used in this reaction has high volatility and is a very toxic substance, which is a serious drawback in use on an industrial scale, and there is a problem in that it is in low yield. As an improved method, Japanese Patent Application Laid-Open No. 2001-64282 (Japanese Patent No. 3563634) discloses a production method using no bromocyan as shown below.

Figure 2013151484
Figure 2013151484

しかしこの製法で用いられるイソチオシアン酸ベンゾイルもやはり毒性が高く、非常に反応性に富む物質であるという問題点があり、また、イソチオシアン酸ベンゾイルに加えて、中間体、および副生成物が臭気のある含イオウ化合物であることからも、より安全かつ環境に配慮した製法が求められた。 However, benzoyl isothiocyanate used in this process is also highly toxic and highly reactive, and in addition to benzoyl isothiocyanate, intermediates and by-products are odorous. Since it is a sulfur-containing compound, a safer and more environmentally friendly production method has been demanded.

特公平3−66311号公報Japanese Patent Publication No. 3-66311 特開2001−64282号公報JP 2001-64282 A

従って、本発明の目的は安価で安全、かつ工業規模で利用できるエピナスチンの製造方法を提供することである。 Accordingly, an object of the present invention is to provide a method for producing epinastine that is inexpensive, safe, and usable on an industrial scale.

本発明者はこの課題解決のため鋭意研究を重ねた結果、
式(I):

Figure 2013151484
で表されるジアミン化合物あるいはその塩と、式(II):
Figure 2013151484
(式中、Rはアルキル基、アルケニル基、アルキニル基あるいはアリール基を表し、Rはアルキル基、アルケニル基、アルキニル基、アリール基、アルコキシ基、アルケニルオキシ基、アルキニルオキシ基、あるいはアリールオキシ基を表す)で表されるイソウレア化合物を反応させることを含む、
式(III):
Figure 2013151484
で表されるエピナスチンおよびその塩の製造方法を見出した。 The inventor has conducted extensive research to solve this problem,
Formula (I):
Figure 2013151484
A diamine compound or a salt thereof represented by formula (II):
Figure 2013151484
Wherein R 1 represents an alkyl group, alkenyl group, alkynyl group or aryl group, and R 2 represents an alkyl group, alkenyl group, alkynyl group, aryl group, alkoxy group, alkenyloxy group, alkynyloxy group or aryloxy Comprising reacting an isourea compound represented by:
Formula (III):
Figure 2013151484
The manufacturing method of epinastine and its salt represented by these was discovered.

式(I)で表されるジアミン化合物あるいはその塩と式(II)で表されるイソウレア化合物を反応させることで得られる化合物は、容易にエピナスチンあるいはその塩に変換することが出来ることを見出し、本発明を完成するに至った。 The compound obtained by reacting the diamine compound represented by the formula (I) or a salt thereof and the isourea compound represented by the formula (II) can be easily converted into epinastine or a salt thereof; The present invention has been completed.

本発明の基本的態様として、式(I)あるいはその塩と式(II)を反応させる工程と、反応により得られた化合物を、さらに酸で処理する工程を含む、エピナスチンあるいはその塩の製造方法である。 As a basic aspect of the present invention, a method for producing epinastine or a salt thereof comprising a step of reacting formula (I) or a salt thereof with formula (II), and a step of further treating the compound obtained by the reaction with an acid It is.

具体的には、本発明ではエピナスチンあるいはその塩は以下の反応式A

Figure 2013151484
Specifically, in the present invention, epinastine or a salt thereof is represented by the following reaction formula A.
Figure 2013151484

(式中、Rはアルキル基、アルケニル基、アルキニル基、あるいはアリール基であり、Rはアルキル基、アルケニル基、アルキニル基、アリール基、アルコキシ基、アルケニルオキシ基、アルキニルオキシ基、あるいはアリールオキシ基である。また、式(I)の化合物は塩の形態であってもよく、式(III)の化合物はいずれかの塩であってもよい)により製造される。 (Wherein R 1 is an alkyl group, alkenyl group, alkynyl group, or aryl group, and R 2 is an alkyl group, alkenyl group, alkynyl group, aryl group, alkoxy group, alkenyloxy group, alkynyloxy group, or aryl group) In addition, the compound of formula (I) may be in the form of a salt, and the compound of formula (III) may be any salt.

およびRにおけるアルキル基とは、C〜Cのアルキル基を指し、直鎖状でも分岐状でも環状でもよく、またフェニル基、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、アミノ基、アミド基などで置換されていてもよい。例えばメチル基、エチル基、n−プロピル基、イソプロピル基、n−ブチル基、イソブチル基、sec−ブチル基、t−ブチル基、シクロペンチル基、シクロヘキシル基、ベンジル基、p−メトキシベンジル基などが含まれる。また、RおよびRにおけるアルケニル基とは、C〜Cのアルケニル基を指し、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、アミノ基、アミド基などで置換されていてもよい。例えばビニル基、アリル基、シクロペンチル基などが含まれる。RおよびRにおけるアルキニル基とは、C〜Cのアルキニル基を指し、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、アミノ基、アミド基、トリアルキルシリル基などで置換されていてもよい。例えばエチニル基、2−トリメチルシリルエチニル基、プロペニル基などが含まれる。RおよびRにおけるアリール基とは、C〜C10のアリール基を指し、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、アミノ基、アミド基などで置換されていてもよい。例えばフェニル基、ナフチル基、p−メトキシフェニル基などが含まれる。また、Rにおけるアルコキシ基とはC〜Cのアルコキシ基を指し、直鎖状でも分岐状でも環状でもよく、またフェニル基、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、アミノ基、アミド基などで置換されていてもよい。例えばメトキシ基、エトキシ基、n−プロピルオキシ基、イソプロピルオキシ基、n−ブトキシ基、イソブトキシ基、sec−ブトキシ基、t−ブトキシ基、シクロペンチルオキシ基、シクロヘキシルオキシ基、ベンジルオキシ基、p−メトキシベンジルオキシ基などが含まれる。また、Rにおけるアルケニルオキシ基とはC〜Cのアルケニルオキシ基を指し、直鎖状でも分岐状でも環状でもよく、またフェニル基、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、アミノ基、アミド基などで置換されていてもよい。例えばビニル基、アリルオキシ基、1−シクロプロペニルオキシ基などが含まれる。Rにおけるアルキニルオキシ基とは、C〜Cのアルキニルオキシ基を指し、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、アミノ基、アミド基、トリアルキルシリル基などで置換されていてもよい。例えば、プロピニル基、3−トリメチルシリル−2−プロピニル基などが含まれる。また、Rにおけるアリールオキシ基とは、C〜C10のアリールオキシ基を指し、ハロゲン、水酸基、アルコキシ基、アシルオキシ基、アミノ基、アミド基などで置換されていてもよい。例えばフェノキシ基、ナフトキシ基、p−メトキシフェノキシ基などが含まれる。 The alkyl group in R 1 and R 2 refers to a C 1 to C 8 alkyl group, which may be linear, branched or cyclic, and is phenyl, halogen, hydroxyl, alkoxy, acyloxy, amino, It may be substituted with an amide group or the like. Examples include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, cyclopentyl, cyclohexyl, benzyl, p-methoxybenzyl, etc. It is. The alkenyl group in R 1 and R 2 refers to a C 1 to C 8 alkenyl group, which may be substituted with a halogen, a hydroxyl group, an alkoxy group, an acyloxy group, an amino group, an amide group, or the like. For example, vinyl group, allyl group, cyclopentyl group and the like are included. The alkynyl group in R 1 and R 2 refers to a C 1 to C 8 alkynyl group, which may be substituted with a halogen, a hydroxyl group, an alkoxy group, an acyloxy group, an amino group, an amide group, a trialkylsilyl group, or the like. . For example, ethynyl group, 2-trimethylsilylethynyl group, propenyl group and the like are included. The aryl group in R 1 and R 2 refers to a C 6 to C 10 aryl group, which may be substituted with a halogen, a hydroxyl group, an alkoxy group, an acyloxy group, an amino group, an amide group, or the like. For example, a phenyl group, a naphthyl group, a p-methoxyphenyl group and the like are included. The alkoxy group in R 2 refers to a C 1 to C 8 alkoxy group, which may be linear, branched or cyclic, and is a phenyl group, halogen, hydroxyl group, alkoxy group, acyloxy group, amino group, amide group. It may be substituted with. For example, methoxy group, ethoxy group, n-propyloxy group, isopropyloxy group, n-butoxy group, isobutoxy group, sec-butoxy group, t-butoxy group, cyclopentyloxy group, cyclohexyloxy group, benzyloxy group, p-methoxy Benzyloxy group and the like are included. The alkenyloxy group in R 2 refers to a C 1 to C 8 alkenyloxy group, which may be linear, branched or cyclic, and is phenyl, halogen, hydroxyl, alkoxy, acyloxy, amino, It may be substituted with an amide group or the like. For example, vinyl group, allyloxy group, 1-cyclopropenyloxy group and the like are included. The alkynyloxy group in R 2 refers to a C 1 to C 8 alkynyloxy group, which may be substituted with a halogen, a hydroxyl group, an alkoxy group, an acyloxy group, an amino group, an amide group, a trialkylsilyl group, or the like. For example, propynyl group, 3-trimethylsilyl-2-propynyl group and the like are included. The aryloxy group in R 2 refers to a C 6 to C 10 aryloxy group, which may be substituted with a halogen, a hydroxyl group, an alkoxy group, an acyloxy group, an amino group, an amide group, or the like. For example, phenoxy group, naphthoxy group, p-methoxyphenoxy group and the like are included.

工程1は式(I)で表されるジアミン化合物を、式(II)で表されるイソウレア化合物と酸存在下で反応させて、式(IV)で表されるN−保護エピナスチン化合物を得る工程である。 Step 1 is a step of reacting the diamine compound represented by the formula (I) with the isourea compound represented by the formula (II) in the presence of an acid to obtain an N-protected epinastine compound represented by the formula (IV). It is.

本工程の原料である式(II)で表されるイソウレア化合物は、O−置換イソウレアあるいはその塩と、クロロギ酸メチル、クロロギ酸ベンジル、あるいは塩化ベンゾイルなどの酸塩化物あるいは酸無水物から公知の合成法により容易に得ることができる。その参考文献としては、米国特許4,045,473などをあげることができる。また、O−置換イソウレアは尿素と、例えば硫酸ジメチルなどのアルキル化剤とから合成することもできる。
このイソウレア化合物は固体または液体として単離して工程1で用いてもよく、あるいは溶液として用いてもよい。
The isourea compound represented by the formula (II) which is the raw material of this step is known from O-substituted isourea or a salt thereof and acid chlorides or acid anhydrides such as methyl chloroformate, benzyl chloroformate, or benzoyl chloride. It can be easily obtained by a synthesis method. Examples of the reference include U.S. Pat. No. 4,045,473. O-substituted isoureas can also be synthesized from urea and an alkylating agent such as dimethyl sulfate.
This isourea compound may be isolated as a solid or liquid and used in Step 1 or may be used as a solution.

式(I)で表されるジアミン化合物と式(II)で表されるイソウレア化合物との量論比は任意であるが、一般的にイソウレア化合物が安価に合成できることから、これをジアミン化合物に対して1当量以上用いることが製造効率上好ましい。 Although the stoichiometric ratio of the diamine compound represented by the formula (I) and the isourea compound represented by the formula (II) is arbitrary, generally the isourea compound can be synthesized at a low cost. It is preferable in view of production efficiency to use 1 equivalent or more.

溶媒は基質と反応しないものであれば特に制限はないが、クロロホルムなどのハロゲン化炭化水素類、トルエンなどの芳香族炭化水素類などの非極性溶媒、メタノールなどのアルコール類、およびこれらを含む混合溶媒が好ましく、クロロホルム、トルエン、メタノールが特に好ましい。溶媒量は特に制限はないが、好ましくは基質に対して5倍体積から20倍体積である。 The solvent is not particularly limited as long as it does not react with the substrate, but non-polar solvents such as halogenated hydrocarbons such as chloroform, aromatic hydrocarbons such as toluene, alcohols such as methanol, and mixtures containing these Solvents are preferred, with chloroform, toluene and methanol being particularly preferred. The amount of solvent is not particularly limited, but is preferably 5 to 20 times the volume of the substrate.

添加する酸はカルボン酸が好ましく、ギ酸、および酢酸が特に好ましい。添加する量は基質に対して0.1当量から50当量であり、好ましくは0.5当量から5当量、特に好ましくは1当量から2当量である。 The acid to be added is preferably a carboxylic acid, and formic acid and acetic acid are particularly preferable. The amount to be added is 0.1 to 50 equivalents, preferably 0.5 to 5 equivalents, particularly preferably 1 to 2 equivalents, relative to the substrate.

あるいは酸を添加せずに、ジアミン化合物の塩を用いることもできる。塩としてはギ酸塩、酢酸塩、あるいはフマル酸塩などのカルボン酸塩が好ましいが、特にフマル酸塩が好ましい。 Or the salt of a diamine compound can also be used, without adding an acid. As the salt, carboxylate such as formate, acetate, or fumarate is preferable, but fumarate is particularly preferable.

反応は40℃から溶媒沸点で行うのが好ましく、反応時間短縮の観点から55℃〜75℃が特に好ましい。 The reaction is preferably carried out at 40 ° C. to the boiling point of the solvent, and particularly preferably 55 ° C. to 75 ° C. from the viewpoint of shortening the reaction time.

目的物である式(IV)のN−保護エピナスチン化合物の単離方法について特に限定はなく、例えば反応液を室温に冷却した後、これを水にあけて有機溶媒で抽出操作を行い、溶媒を留去して得られた残渣をカラムクロマトグラフィーにより行うことができる。あるいは、この化合物を単離精製することなく次の工程の反応に付すこともできる。 There is no particular limitation on the method for isolating the N-protected epinastine compound of formula (IV), which is the target product. For example, after cooling the reaction solution to room temperature, the reaction solution is poured into water and extracted with an organic solvent. The residue obtained by distilling off can be performed by column chromatography. Alternatively, this compound can be subjected to the next step reaction without isolation and purification.

また、このN−保護エピナスチン化合物は塩酸塩などの塩として単離することもできる。 The N-protected epinastine compound can also be isolated as a salt such as hydrochloride.

式(IV)で表されるN−保護エピナスチン化合物は本製造法によるエピナスチン合成における鍵中間体であることから、産業上非常に有用な化合物である。したがって、本化合物における、エピナスチンのアミノ基の保護基を成す部分構造であるRC(=O)−としては容易に脱保護可能であるものが好ましく、そのRとしてはメトキシ基、エトキシ基、t−ブトキシ基、ベンジルオキシ基、p−メトキシベンジルオキシ基、メチル基、t−ブチル基、およびフェニル基が好ましい。特にメトキシ基、エトキシ基、ベンジルオキシ基、フェニル基が好ましい。 The N-protected epinastine compound represented by the formula (IV) is an industrially very useful compound because it is a key intermediate in epinastine synthesis by this production method. Therefore, in the present compound, R 2 C (═O) —, which is a partial structure that forms a protective group for the amino group of epinastine, is preferably one that can be easily deprotected, and R 2 is preferably a methoxy group or an ethoxy group. T-butoxy group, benzyloxy group, p-methoxybenzyloxy group, methyl group, t-butyl group, and phenyl group are preferable. In particular, a methoxy group, an ethoxy group, a benzyloxy group, and a phenyl group are preferable.

このようにして得られた式(IV)のN−保護エピナスチン化合物は、工程2で保護基を除去してエピナスチンあるいはその塩に効率よく変換することができる。その参考文献としては、“Protective Groups in Organic Synthesis, 2nd Edition”(T.W.Green,P.G.M.Wuts著, Johnson Wiley & Sons, Inc. New York)などをあげることができる。 The N-protected epinastine compound of formula (IV) thus obtained can be efficiently converted to epinastine or a salt thereof by removing the protecting group in step 2. References include “Protective Groups in Organic Synthesis, 2nd Edition” (by TW Green, PMGM Wuts, Johnson Wiley & Sons, Inc. New York), and the like.

また別の態様として、本発明ではエピナスチンあるいはその塩は以下の反応式B

Figure 2013151484
In another embodiment, epinastine or a salt thereof is represented by the following reaction formula B
Figure 2013151484

(式中、Xは酸を表す。Rはアルキル基、アルケニル基、アルキニル基、あるいはアリール基であり、Rはアルキル基、アルケニル基、アルキニル基、アリール基、アルコキシ基、アルケニルオキシ基、アルキニルオキシ基、あるいはアリールオキシ基である。また、式(V)の化合物は塩の形態であり、式(III)の化合物はいずれかの塩であってもよい)によっても製造される。 (In the formula, X represents an acid. R 1 represents an alkyl group, an alkenyl group, an alkynyl group, or an aryl group, and R 2 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, an alkenyloxy group, An alkynyloxy group or an aryloxy group, and the compound of formula (V) is in the form of a salt, and the compound of formula (III) may be any salt).

およびRにおけるアルキル基、アルケニル基、アルキニル基あるいはアリール基、Rにおけるアルコキシ基、アルケニルオキシ基、アルキニルオキシ基およびアリールオキシ基は、いずれも前記に定めたものである。中でもRとしてはメトキシ基、エトキシ基、t−ブトキシ基、ベンジルオキシ基、p−メトキシベンジルオキシ基などのアルコキシ基、メチル基、t−ブチル基などのアルキル基およびフェニル基が好ましい。特にメトキシ基、エトキシ基、ベンジルオキシ基、フェニル基が好ましい。 The alkyl group, alkenyl group, alkynyl group or aryl group in R 1 and R 2 and the alkoxy group, alkenyloxy group, alkynyloxy group and aryloxy group in R 2 are all as defined above. Among them, R 2 is preferably an alkoxy group such as a methoxy group, an ethoxy group, a t-butoxy group, a benzyloxy group or a p-methoxybenzyloxy group, an alkyl group such as a methyl group or a t-butyl group, and a phenyl group. In particular, a methoxy group, an ethoxy group, a benzyloxy group, and a phenyl group are preferable.

本工程の原料である式(II)で表されるイソウレア化合物は、前記に定めたものであり、このイソウレア化合物は固体または液体として単離して工程3で用いてもよく、あるいは溶液として用いてもよい。 The isourea compound represented by the formula (II) which is the raw material of this step is as defined above, and this isourea compound may be isolated as a solid or liquid and used in Step 3, or as a solution. Also good.

工程3は式(V)で表されるジアミン化合物の塩を、式(II)で表されるイソウレア化合物と反応させて、式(VI)で表されるイソウレア付加体を得る工程である。 Step 3 is a step of reacting the salt of the diamine compound represented by the formula (V) with the isourea compound represented by the formula (II) to obtain the isourea adduct represented by the formula (VI).

本発明の反応式Bにおいて、式(V)で表されるジアミン化合物の塩を解塩することなく非プロトン性極性溶媒中で反応を行なうと、本反応は速やかに進行し、生成物は反応式Aにおける式(IV)の化合物とは異なる式(VI)で表されるイソウレア付加体が得られる。さらに、このイソウレア付加体を用いて反応式(A)の工程2と同様の反応条件で閉環反応を行ったところ、生成物として直接、式(III)で表されるエピナスチンが生成する。 In the reaction formula B of the present invention, when the reaction is carried out in an aprotic polar solvent without salting out the salt of the diamine compound represented by the formula (V), the reaction proceeds promptly and the product is reacted. An isourea adduct represented by the formula (VI) different from the compound of the formula (IV) in the formula A is obtained. Furthermore, when this ring reaction was carried out using this isourea adduct under the same reaction conditions as in Step 2 of Reaction Formula (A), epinastine represented by Formula (III) is directly generated as a product.

式(V)で表されるジアミン化合物の塩と式(II)で表されるイソウレア化合物との量論比は任意であるが、一般的にイソウレア化合物が安価に合成できることから、これをジアミン化合物に対して1当量以上用いることが製造効率上好ましい。 Although the stoichiometric ratio of the salt of the diamine compound represented by the formula (V) and the isourea compound represented by the formula (II) is arbitrary, generally the isourea compound can be synthesized at a low cost. In terms of production efficiency, it is preferable to use 1 equivalent or more based on the above.

本発明は非プロトン性極性溶媒を用いることを特徴とするものであり、溶媒は基質と反応しないものであれば特に制限はないが、N,N−ジメチルホルムアミド、N,N−ジメチルアセトアミド、1−メチル−2−ピロリドン、などのアミド類、アセトンなどのケトン類、アセトニトリルなどのニトリル類、ジメチルスルホキシドおよびこれらを含む混合溶媒が好ましい。溶媒量は特に制限はないが、好ましくは基質に対して1倍体積から30倍体積である。 The present invention is characterized in that an aprotic polar solvent is used, and the solvent is not particularly limited as long as it does not react with the substrate, but N, N-dimethylformamide, N, N-dimethylacetamide, 1 -Amides such as methyl-2-pyrrolidone, ketones such as acetone, nitriles such as acetonitrile, dimethyl sulfoxide, and mixed solvents containing these are preferred. The amount of the solvent is not particularly limited, but is preferably 1 to 30 times the volume of the substrate.

本反応は式(V)で表されるジアミン化合物の塩を原料として用いることを特徴とするものであるが、さらに、酸を添加して行うこともできる。塩としてはギ酸塩、酢酸塩、あるいはフマル酸塩などのカルボン酸塩が好ましいが、特にフマル酸塩が好ましい。添加する酸は、前記に定義した通りカルボン酸が好ましく、ギ酸、および酢酸が特に好ましい。 This reaction is characterized by using a salt of a diamine compound represented by the formula (V) as a raw material, and can also be carried out by adding an acid. As the salt, carboxylate such as formate, acetate, or fumarate is preferable, but fumarate is particularly preferable. The acid to be added is preferably a carboxylic acid as defined above, and particularly preferably formic acid and acetic acid.

反応は40℃から溶媒沸点で行うのが好ましく、沸点以下の範囲で、反応時間短縮の観点から50℃〜100℃が特に好ましい。 The reaction is preferably carried out from 40 ° C. to the boiling point of the solvent, particularly preferably from 50 ° C. to 100 ° C. from the viewpoint of shortening the reaction time in the range below the boiling point.

式(VI)のイソウレア付加体の単離方法について特に限定はなく、例えば反応液を室温に冷却した後、これを水にあけて有機溶媒で抽出操作を行い、溶媒を留去して得られた残渣をカラムクロマトグラフィーにより行うことができる。あるいは、この化合物を単離精製することなく次の工程の反応に付すこともできる。 The method for isolating the isourea adduct of formula (VI) is not particularly limited. For example, the reaction solution is cooled to room temperature, then poured into water and extracted with an organic solvent, and the solvent is distilled off. The residue can be obtained by column chromatography. Alternatively, this compound can be subjected to the next step reaction without isolation and purification.

式(VI)で表されるイソウレア付加体は本製造法によるエピナスチン合成における鍵中間体であることから、産業上非常に有用な化合物である。 The isourea adduct represented by the formula (VI) is an industrially very useful compound because it is a key intermediate in the epinastine synthesis by this production method.

このようにして得られた式(VI)のイソウレア付加体は、工程4にて酸存在下で反応させることにより、エピナスチンあるいはその塩に効率よく変換することができる。 The isourea adduct of the formula (VI) thus obtained can be efficiently converted to epinastine or a salt thereof by reacting in the presence of an acid in Step 4.

工程4で添加する酸はカルボン酸が好ましく、酢酸およびギ酸が特に好ましい。添加する量は基質に対して0.1当量から50当量であり、好ましくは0.5当量から20当量、特に好ましくは1当量から10当量である。この酸は反応開始時に一括で添加してもよいが、反応中に分割して添加するか、ゆっくり継続して添加する方法が好ましい。 The acid added in Step 4 is preferably a carboxylic acid, particularly preferably acetic acid and formic acid. The amount to be added is 0.1 to 50 equivalents, preferably 0.5 to 20 equivalents, particularly preferably 1 to 10 equivalents, relative to the substrate. Although this acid may be added all at once at the start of the reaction, a method of adding it in portions during the reaction or adding it slowly slowly is preferred.

本発明の製造法は、有害なブロモシアンを使用しないことから安全な方法である。また、臭気のあるイオウ化合物を用いることもなく、それらが副生成物として生成することもないことから環境負荷が少ない。これらの代わりに本製造法で用いられるイソウレア化合物は、いずれも安価に効率よく合成できるという利点を有している。また、工程1、工程2、工程3および工程4はいずれも特殊な製造設備を必要とせず、一般的な反応剤および溶媒から温和な条件で収率よく目的物を与えるものである。従って、本製造法はエピナスチンの製造法として工業規模で行われるのに非常に好ましい方法である。 The production method of the present invention is safe because it does not use harmful bromocyan. In addition, there is little environmental load because no odorous sulfur compounds are used and they are not produced as by-products. Instead of these, all of the isourea compounds used in this production method have the advantage that they can be synthesized efficiently at low cost. Further, Step 1, Step 2, Step 3 and Step 4 do not require any special production equipment, and give the target product in a high yield from a general reactant and solvent under mild conditions. Therefore, this production method is a very preferable method for carrying out on an industrial scale as a production method of epinastine.

以下、実施例を用いて本発明を説明するが、これらによって本発明がなんら限定を受けることはない。なお、本発明の方法で製造されるエピナスチンは、通常の方法により塩酸塩等の塩に変換することができる。 EXAMPLES Hereinafter, although this invention is demonstrated using an Example, this invention does not receive any limitation by these. In addition, epinastine manufactured by the method of the present invention can be converted into a salt such as hydrochloride by a conventional method.

参考例1 N−(イミノメトキシメチル)カルバミン酸メチルの合成
O−メチルイソウレア塩酸塩 5.53g(50.0ミリモル)を水 45mLに溶解し、5℃に冷却した。ここにクロロギ酸メチル 5.20g(55.0ミリモル)を加え、さらに温度を5℃以下に保ちながら50%水酸化ナトリウム水溶液 12.0gを滴下した後、室温で3時間撹拌した。ジクロロメタン各40mLを用いて3回抽出し、有機層を合わせて硫酸ナトリウムで乾燥して濾過した。溶媒を減圧留去して表題化合物5.21gを無色の油状物質として得た(収率79%)。この化合物は室温で放置したところ、白色の固体へと固化した。この化合物を精製することなく以下の反応に供した。
H−NMR(CDCl3,400MHz),δ(ppm):3.74(s,3H),3.84(s,3H),5.39(brs,1H),8.35(brs,1H).
Reference Example 1 Synthesis of methyl N- (iminomethoxymethyl) carbamate 5.53 g (50.0 mmol) of O-methylisourea hydrochloride was dissolved in 45 mL of water and cooled to 5 ° C. To this was added 5.20 g (55.0 mmol) of methyl chloroformate, and 12.0 g of a 50% aqueous sodium hydroxide solution was added dropwise while keeping the temperature at 5 ° C. or lower, followed by stirring at room temperature for 3 hours. Extraction was performed 3 times using 40 mL each of dichloromethane, and the organic layers were combined, dried over sodium sulfate, and filtered. The solvent was distilled off under reduced pressure to obtain 5.21 g of the title compound as a colorless oily substance (yield 79%). When this compound was allowed to stand at room temperature, it solidified into a white solid. This compound was subjected to the following reaction without purification.
1 H-NMR (CDCl3, 400 MHz), δ (ppm): 3.74 (s, 3H), 3.84 (s, 3H), 5.39 (brs, 1H), 8.35 (brs, 1H) .

実施例1 N−(9,13b−ジヒドロ−1H−ジベンズ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸メチル(式(IVa))の合成 Example 1 Synthesis of methyl N- (9,13b-dihydro-1H-dibenz [c, f] imidazo [1,5-a] azepin-3-yl) -carbamate (formula (IVa))

Figure 2013151484
Figure 2013151484

5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミン 0.45g(2.0ミリモル)およびN−(イミノメトキシメチル)カルバミン酸メチル 0.26g(2.0ミリモル)をクロロホルム 4.5mLに溶解し、酢酸 0.15mL(2.6ミリモル)を加えて12時間還流した。反応液を冷却し、飽和重曹水にあけてクロロホルム 各15mLで3回抽出した。有機層を集めて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥し、濾過した。濾液を濃縮して得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム/メタノール=100:1)で精製して表題化合物 0.42gを淡黄白色の固体として得た(収率 69%)。
H−NMR(CDCl,400MHz):3.49(d,J=14.3Hz,1H),3.61−3.66(m,1H),3.66(s,3H),4.21(t,J=9.2Hz,1H),4.60(d,J=14.2Hz,1H),5.17(dd,J=11.0,9.2Hz,1H),6.98−7.00(m,1H),7.16−7.20(m,3H),7.24−7.46(m,3H),7.47(m,1H),8.54(brs,1H).
MS(m/z):308(M+H
0.45 g (2.0 mmol) of 5H-dibenz [b, e] azepine-6,11-dihydro-6-methanamine and 0.26 g (2.0 mmol) of methyl N- (iminomethoxymethyl) carbamate were mixed with chloroform. It melt | dissolved in 4.5 mL, 0.15 mL (2.6 mmol) of acetic acid was added, and it recirculate | refluxed for 12 hours. The reaction mixture was cooled, poured into saturated aqueous sodium hydrogen carbonate, and extracted three times with 15 mL each of chloroform. The organic layer was collected, washed with saturated brine, dried over sodium sulfate, and filtered. The residue obtained by concentrating the filtrate was purified by column chromatography (silica gel, chloroform / methanol = 100: 1) to obtain 0.42 g of the title compound as a pale yellowish white solid (yield 69%).
1 H-NMR (CDCl 3 , 400 MHz): 3.49 (d, J = 14.3 Hz, 1H), 3.61-3.66 (m, 1H), 3.66 (s, 3H), 4. 21 (t, J = 9.2 Hz, 1H), 4.60 (d, J = 14.2 Hz, 1H), 5.17 (dd, J = 11.0, 9.2 Hz, 1H), 6.98 -7.00 (m, 1H), 7.16-7.20 (m, 3H), 7.24-7.46 (m, 3H), 7.47 (m, 1H), 8.54 (brs) , 1H).
MS (m / z): 308 (M + H < + > )

実施例2 N−(9,13b−ジヒドロ−1H−ジベンズ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸メチル(式(IVa))の合成
5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミン 0.45g(2.0ミリモル)およびN−(イミノメトキシメチル)カルバミン酸メチル 0.26g(2.0ミリモル)をトルエン 4.5mLに溶解し、酢酸 0.15mL(2.6ミリモル)を加えて70℃で15時間攪拌した。反応液を冷却し、溶媒を減圧留去した。この残渣にクロロホルム 15mLおよび飽和重曹水 15mLを加え、分液ろうとに移して激しく振とうした。有機層を貯液し、水層をクロロホルム 各15mLで2回抽出した。有機層を集めて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥し、濾過した。濾液を濃縮して得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム/メタノール=100:1)で精製して表題化合物 0.49gを淡黄白色の固体として得た(収率 79%)。
Example 2 Synthesis of methyl N- (9,13b-dihydro-1H-dibenz [c, f] imidazo [1,5-a] azepin-3-yl) -carbamate (formula (IVa)) 5H-Dibenz [ b, e] azepine-6,11-dihydro-6-methanamine 0.45 g (2.0 mmol) and methyl N- (iminomethoxymethyl) carbamate 0.26 g (2.0 mmol) in 4.5 mL toluene. After dissolution, 0.15 mL (2.6 mmol) of acetic acid was added and stirred at 70 ° C. for 15 hours. The reaction solution was cooled and the solvent was distilled off under reduced pressure. To this residue, 15 mL of chloroform and 15 mL of saturated aqueous sodium bicarbonate were added, transferred to a separatory funnel and shaken vigorously. The organic layer was stored and the aqueous layer was extracted twice with 15 mL each of chloroform. The organic layer was collected, washed with saturated brine, dried over sodium sulfate, and filtered. The residue obtained by concentrating the filtrate was purified by column chromatography (silica gel, chloroform / methanol = 100: 1) to obtain 0.49 g of the title compound as a pale yellowish white solid (79% yield).

実施例3 N−(9,13b−ジヒドロ−1H−ジベンズ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸メチル(式(IVa))の合成
5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミン 0.45g(2.0ミリモル)およびN−(イミノメトキシメチル)カルバミン酸メチル 0.26g(2.0ミリモル)をメタノール 4.5mLに溶解し、ギ酸 0.10mL(2.6ミリモル)を加えて18時間還流した。反応液を冷却し、溶媒を減圧留去した。この残渣にクロロホルム 20mLおよび飽和重曹水 15mLを加え、分液ろうとに移して激しく振とうした。有機層を貯液し、水層をクロロホルム 各15mLで2回抽出した。有機層を集めて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥し、濾過した。濾液を濃縮して得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム/メタノール=100:1)で精製して表題化合物 0.48gを淡黄白色の固体として得た(収率 79%)。
Example 3 Synthesis of methyl N- (9,13b-dihydro-1H-dibenz [c, f] imidazo [1,5-a] azepin-3-yl) -carbamate (formula (IVa)) 5H-Dibenz [ b, e] azepine-6,11-dihydro-6-methanamine 0.45 g (2.0 mmol) and methyl N- (iminomethoxymethyl) carbamate 0.26 g (2.0 mmol) in 4.5 mL methanol After dissolution, 0.10 mL (2.6 mmol) of formic acid was added and refluxed for 18 hours. The reaction solution was cooled and the solvent was distilled off under reduced pressure. To this residue, 20 mL of chloroform and 15 mL of saturated aqueous sodium bicarbonate were added, transferred to a separatory funnel and shaken vigorously. The organic layer was stored and the aqueous layer was extracted twice with 15 mL each of chloroform. The organic layer was collected, washed with saturated brine, dried over sodium sulfate, and filtered. The residue obtained by concentrating the filtrate was purified by column chromatography (silica gel, chloroform / methanol = 100: 1) to obtain 0.48 g of the title compound as a pale yellowish white solid (79% yield).

実施例4 N−(9,13b−ジヒドロ−1H−ジベンズ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸メチル(式(IVa))の合成
5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミンフマル酸塩 0.62g(2.0ミリモル)およびN−(イミノメトキシメチル)カルバミン酸メチル 0.26g(2.0ミリモル)をメタノール 4.5mLに加えて18時間還流した。反応液を冷却し、溶媒を減圧留去した。この残渣にクロロホルム 20mLおよび飽和重曹水 15mLを加え、分液ろうとに移して激しく振とうした。有機層を貯液し、水層をクロロホルム 各15mLで2回抽出した。有機層を集めて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥し、濾過した。濾液を濃縮して得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム/メタノール=100:1)で精製して表題化合物 0.40gを淡黄白色の固体として得た(収率 65%)。
Example 4 Synthesis of methyl N- (9,13b-dihydro-1H-dibenz [c, f] imidazo [1,5-a] azepin-3-yl) -carbamate (formula (IVa)) 5H-Dibenz [ b, e] azepine-6,11-dihydro-6-methanamine fumarate 0.62 g (2.0 mmol) and methyl N- (iminomethoxymethyl) carbamate 0.26 g (2.0 mmol) in methanol Added to 4.5 mL and refluxed for 18 hours. The reaction solution was cooled and the solvent was distilled off under reduced pressure. To this residue, 20 mL of chloroform and 15 mL of saturated aqueous sodium bicarbonate were added, transferred to a separatory funnel and shaken vigorously. The organic layer was stored and the aqueous layer was extracted twice with 15 mL each of chloroform. The organic layer was collected, washed with saturated brine, dried over sodium sulfate, and filtered. The residue obtained by concentrating the filtrate was purified by column chromatography (silica gel, chloroform / methanol = 100: 1) to obtain 0.40 g of the title compound as a pale yellowish white solid (yield 65%).

参考例2 N−(イミノメトキシメチル)カルバミン酸エチルの合成
O−メチルイソウレア塩酸塩 1.11g(10.0ミリモル)を水 14mLに溶解し、5℃に冷却した。ここにクロロギ酸エチル 1.19g(11.0ミリモル)を加え、さらに温度を5℃以下に保ちながら50%水酸化ナトリウム水溶液 2.40gを滴下した後、室温で19時間撹拌した。ジクロロメタン各20mLを用いて3回抽出し、有機層を合わせて硫酸ナトリウムで乾燥して濾過した。溶媒を減圧留去して表題化合物 0.92gを無色の油状物質として得た(収率63%)。この化合物を精製することなく以下の反応に供した。
H−NMR(CDCl3,400MHz):1.33(t,J=7.8Hz,3H),3.85(s,3H),4.16(q,J=7.8Hz,2H),5.36(brs,1H),8.29(brs,1H).
Reference Example 2 Synthesis of ethyl N- (iminomethoxymethyl) carbamate 1.11 g (10.0 mmol) of O-methylisourea hydrochloride was dissolved in 14 mL of water and cooled to 5 ° C. 1.19 g (11.0 mmol) of ethyl chloroformate was added thereto, and 2.40 g of 50% aqueous sodium hydroxide solution was added dropwise while maintaining the temperature at 5 ° C. or lower, and the mixture was stirred at room temperature for 19 hours. Extraction was performed 3 times using 20 mL of dichloromethane, and the organic layers were combined, dried over sodium sulfate, and filtered. The solvent was distilled off under reduced pressure to obtain 0.92 g of the title compound as a colorless oil (yield 63%). This compound was subjected to the following reaction without purification.
1 H-NMR (CDCl 3, 400 MHz): 1.33 (t, J = 7.8 Hz, 3H), 3.85 (s, 3H), 4.16 (q, J = 7.8 Hz, 2H), 5 .36 (brs, 1H), 8.29 (brs, 1H).

実施例5 N−(9,13b−ジヒドロ−1H−ジベンズ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸エチル(式(IVb))の合成 Example 5 Synthesis of ethyl N- (9,13b-dihydro-1H-dibenz [c, f] imidazo [1,5-a] azepin-3-yl) -carbamate (formula (IVb))

Figure 2013151484
Figure 2013151484

5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミン 0.45g(2.0ミリモル)およびN−(イミノメトキシメチル)カルバミン酸エチル 0.29g(2.0ミリモル)をトルエン 4.5mLに溶解し、酢酸 0.15mL(2.6ミリモル)を加えて70℃で16時間攪拌した。反応液を冷却し、飽和重曹水にあけてクロロホルム 各15mLで3回抽出した。有機層を集めて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥して濾過した。濾液を濃縮して得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム/メタノール=100:1)で精製して表題化合物 0.56gを微黄白色の固体として得た(収率 87%)。
H−NMR(CDCl3,400MHz): 1.27(t,J=7.1Hz,3H),3.48(d,J=14.3Hz,1H),3.60−3.66(m,1H),3.83(brs,2H),4.05−4.16(m,2H),4.20(t,J=9.3Hz,1H),4.61(d,J=14.2Hz,1H),5.15(dd、J=11.6,9.2Hz,1H),6.97−7.00(m,1H),7.48(dd、J=7.9,1.2Hz,1H),8.34(brs,1H).
MS(m/z):322(M+H+)
0.45 g (2.0 mmol) of 5H-dibenz [b, e] azepine-6,11-dihydro-6-methanamine and 0.29 g (2.0 mmol) of ethyl N- (iminomethoxymethyl) carbamate were dissolved in toluene. It melt | dissolved in 4.5 mL, 0.15 mL (2.6 mmol) of acetic acid was added, and it stirred at 70 degreeC for 16 hours. The reaction mixture was cooled, poured into saturated aqueous sodium hydrogen carbonate, and extracted three times with 15 mL each of chloroform. The organic layer was collected, washed with saturated brine, dried over sodium sulfate and filtered. The residue obtained by concentrating the filtrate was purified by column chromatography (silica gel, chloroform / methanol = 100: 1) to obtain 0.56 g of the title compound as a pale yellowish white solid (yield 87%).
1 H-NMR (CDCl 3,400 MHz): 1.27 (t, J = 7.1 Hz, 3H), 3.48 (d, J = 14.3 Hz, 1H), 3.60-3.66 (m, 1H), 3.83 (brs, 2H), 4.05-4.16 (m, 2H), 4.20 (t, J = 9.3 Hz, 1H), 4.61 (d, J = 14. 2 Hz, 1H), 5.15 (dd, J = 11.6, 9.2 Hz, 1H), 6.97-7.00 (m, 1H), 7.48 (dd, J = 7.9, 1 .2 Hz, 1H), 8.34 (brs, 1H).
MS (m / z): 322 (M + H +)

参考例3 N−(イミノメトキシメチル)カルバミン酸ベンジルの合成
O−メチルイソウレア塩酸塩 1.11g(10.0ミリモル)を水 14mLに溶解し、5℃に冷却した。ここにクロロギ酸ベンジル 1.88g(11.0ミリモル)とテトラヒドロフラン 7mLを加え、さらに温度を5℃以下に保ちながら50%水酸化ナトリウム水溶液 2.40gを滴下した後、室温で19時間撹拌した。クロロホルム各25mLを用いて3回抽出し、有機層を合わせて硫酸ナトリウムで乾燥して濾過した。溶媒を減圧留去して表題化合物2.09gを無色の油状物質として得た(収率90%)。この化合物を精製することなく以下の反応に供した。
H−NMR(CDCl3,400MHz):3.84(s,3H),5.16(s,2H),5.38(brs,1H),7.31−7.42(m,5H),8.23(brs,1H).
Reference Example 3 Synthesis of benzyl N- (iminomethoxymethyl) carbamate 1.11 g (10.0 mmol) of O-methylisourea hydrochloride was dissolved in 14 mL of water and cooled to 5 ° C. To this, 1.88 g (11.0 mmol) of benzyl chloroformate and 7 mL of tetrahydrofuran were added, and 2.40 g of 50% aqueous sodium hydroxide solution was added dropwise while keeping the temperature at 5 ° C. or lower, followed by stirring at room temperature for 19 hours. Extraction was performed three times using 25 mL of chloroform, and the organic layers were combined, dried over sodium sulfate, and filtered. The solvent was distilled off under reduced pressure to obtain 2.09 g of the title compound as a colorless oil (yield 90%). This compound was subjected to the following reaction without purification.
1 H-NMR (CDCl3, 400 MHz): 3.84 (s, 3H), 5.16 (s, 2H), 5.38 (brs, 1H), 7.31-7.42 (m, 5H), 8.23 (brs, 1H).

実施例6 N−(9,13b−ジヒドロ−1H−ジベンズ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸ベンジル(式(IVc))の合成 Example 6 Synthesis of N- (9,13b-dihydro-1H-dibenz [c, f] imidazo [1,5-a] azepin-3-yl) -benzyl carbamate (formula (IVc))

Figure 2013151484
Figure 2013151484

5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミン 0.45g(2.0ミリモル)およびN−(イミノメトキシメチル)カルバミン酸ベンジル 0.47g(2.0ミリモル)をトルエン 4.5mLに溶解し、酢酸 0.15mL(2.6ミリモル)を加えて70℃で14時間攪拌した。反応液を冷却し、飽和重曹水にあけてクロロホルム 各15mLで3回抽出した。有機層を集めて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥して濾過した。濾液を濃縮して得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム)で精製して表題化合物 0.42gを淡黄色の泡状物質として得た(収率 64%)。
H−NMR(CDCl3,400MHz):3.48(d,J=14.3Hz,1H),3.61(t,J=10.2Hz,1H),4.12(t,J=9.2Hz,1H),4.21(t,J=14.2Hz,1H),4.60(d,J=14.2Hz,1H),5.10(s,2H),5.14(t,J=9.2Hz,1H),6.96−6.99(m,1H),7.16−7.19(m,3H),7.24−7.33(m,6H),7.36−7.39(m,2H),7.48(d,J=7.3Hz,1H),8.31(brs,1H).
MS(m/z):384(M+H+)
0.45 g (2.0 mmol) of 5H-dibenz [b, e] azepine-6,11-dihydro-6-methanamine and 0.47 g (2.0 mmol) of benzyl N- (iminomethoxymethyl) carbamate were dissolved in toluene. It melt | dissolved in 4.5 mL, 0.15 mL (2.6 mmol) of acetic acid was added, and it stirred at 70 degreeC for 14 hours. The reaction mixture was cooled, poured into saturated aqueous sodium hydrogen carbonate, and extracted three times with 15 mL each of chloroform. The organic layer was collected, washed with saturated brine, dried over sodium sulfate and filtered. The residue obtained by concentrating the filtrate was purified by column chromatography (silica gel, chloroform) to obtain 0.42 g of the title compound as a pale yellow foam (yield 64%).
1 H-NMR (CDCl 3, 400 MHz): 3.48 (d, J = 14.3 Hz, 1 H), 3.61 (t, J = 10.2 Hz, 1 H), 4.12 (t, J = 9. 2 Hz, 1H), 4.21 (t, J = 14.2 Hz, 1H), 4.60 (d, J = 14.2 Hz, 1H), 5.10 (s, 2H), 5.14 (t, J = 9.2 Hz, 1H), 6.96-6.99 (m, 1H), 7.16-7.19 (m, 3H), 7.24-7.33 (m, 6H), 7. 36-7.39 (m, 2H), 7.48 (d, J = 7.3 Hz, 1H), 8.31 (brs, 1H).
MS (m / z): 384 (M + H +)

参考例4 N−(イミノメトキシメチル)ベンズアミドの合成
O−メチルイソウレア塩酸塩 1.11g(10.0ミリモル)を水 15mLおよびジクロロメタン 15mLの混液に溶解して5℃に冷却した。ここに塩化ベンゾイル 1.55g(11.0ミリモル)を加えた。温度を5℃以下に保ちながら、ここに50%水酸化ナトリウム水溶液 2.4gを加えた後、激しく撹拌しながら室温で17時間撹拌した。有機層を貯液し、水層をジクロロメタン 各15mLで2回抽出した。有機層を合わせて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥して濾過した。溶媒を減圧留去して表題化合物 1.58gを白色の固体として得た(収率 89%)。この物質を精製することなく以下の反応に供した。
H−NMR(CDCl3,400MHz):4.01(s,3H),5.56(brs,1H),7.43−7.43(m,2H),7.50−7.55(m,1H),8.28−8.30(m,1H),9.27(brs,1H).
Reference Example 4 Synthesis of N- (iminomethoxymethyl) benzamide 1.11 g (10.0 mmol) of O-methylisourea hydrochloride was dissolved in a mixture of 15 mL of water and 15 mL of dichloromethane and cooled to 5 ° C. To this was added 1.55 g (11.0 mmol) of benzoyl chloride. While maintaining the temperature at 5 ° C. or lower, 2.4 g of a 50% aqueous sodium hydroxide solution was added thereto, followed by stirring at room temperature for 17 hours with vigorous stirring. The organic layer was stored and the aqueous layer was extracted twice with 15 mL each of dichloromethane. The organic layers were combined, washed with saturated brine, dried over sodium sulfate, and filtered. The solvent was distilled off under reduced pressure to obtain 1.58 g of the title compound as a white solid (yield 89%). This material was subjected to the following reaction without purification.
1 H-NMR (CDCl3,400MHz): 4.01 (s, 3H), 5.56 (brs, 1H), 7.43-7.43 (m, 2H), 7.50-7.55 (m , 1H), 8.28-8.30 (m, 1H), 9.27 (brs, 1H).

実施例7 N−(9,13b−ジヒドロ−1H−ジベンズ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)ベンズアミド(IVd)の合成 Example 7 Synthesis of N- (9,13b-dihydro-1H-dibenz [c, f] imidazo [1,5-a] azepin-3-yl) benzamide (IVd)

Figure 2013151484
Figure 2013151484

5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミン 0.45g(2.0ミリモル)およびN−(イミノメトキシメチル)ベンズアミド 0.36g(2.0ミリモル)をトルエン 4.5mLに溶解し、酢酸 0.14mL(2.6ミリモル)を加えて70℃で13時間攪拌した。反応液を冷却し、飽和重曹水 15mLにあけてクロロホルム 各20mLで3回抽出した。有機層を集めて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥し、濾過した。濾液を濃縮して得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム/メタノール=100:1)で精製して表題化合物 0.48gを淡黄白色の固体として得た(収率 67%)。
H−NMR(DMSO−d6,400MHz):3.57(t,J=10.3Hz,1H),3.69(d,J=14.2Hz,1H),4.29(t,J=9.5Hz,1H),4.48(d,J=13.9Hz,1H),5.22(dd,J=11.4Hz,9.3Hz,1H),7.22−7.48(m,10H),7.60(dd,J=7.9,1.1Hz,1H),7.94−7.96(m,2H),9.25(brs,1H)
3. 0.45 g (2.0 mmol) of 5H-dibenz [b, e] azepine-6,11-dihydro-6-methanamine and 0.36 g (2.0 mmol) of N- (iminomethoxymethyl) benzamide in toluene It melt | dissolved in 5 mL, 0.14 mL (2.6 mmol) of acetic acid was added, and it stirred at 70 degreeC for 13 hours. The reaction solution was cooled, poured into 15 mL of saturated aqueous sodium hydrogen carbonate, and extracted three times with 20 mL each of chloroform. The organic layer was collected, washed with saturated brine, dried over sodium sulfate, and filtered. The residue obtained by concentrating the filtrate was purified by column chromatography (silica gel, chloroform / methanol = 100: 1) to obtain 0.48 g of the title compound as a pale yellowish white solid (yield 67%).
1 H-NMR (DMSO-d6, 400 MHz): 3.57 (t, J = 10.3 Hz, 1H), 3.69 (d, J = 14.2 Hz, 1H), 4.29 (t, J = 9.5 Hz, 1 H), 4.48 (d, J = 13.9 Hz, 1 H), 5.22 (dd, J = 11.4 Hz, 9.3 Hz, 1 H), 7.22-7.48 (m , 10H), 7.60 (dd, J = 7.9, 1.1 Hz, 1H), 7.94-7.96 (m, 2H), 9.25 (brs, 1H)

実施例8 N−(9,13b−ジヒドロ−1H−ジベンゾ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸メチル塩酸塩の合成
N−(9,13b−ジヒドロ−1H−ジベンゾ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸メチル 0.38g(1.3ミリモル)をメタノール 2.6mLに加え、ここに1規定塩酸 1.3mLを加えて室温で30分攪拌した。溶媒を留去し、残渣にトルエン 10mLを加えて再び溶媒を留去した。トルエン 3mLおよび2−プロパノール 1mLを加えて室温で30分撹拌した後、固体を濾取した。濾過ケーキをトルエン/2−プロパノール混液(10:1)で洗浄し、50℃で減圧乾燥して表題化合物 0.37gを微黄白色の固体として得た(収率 85%)。
H−NMR(DMSO−d6,400MHz):3.61−3.70(m,2H),3.74(s,3H),4.54(t,J=10.4Hz,1H),4.59(d,J=14.2Hz,1H),5.39(t,J=10.6Hz,1H),7.17−7.20(m,1H),7.21−7.28(m,2H),7.32−7.39(m,2H),7.44−7.48(m,1H),7.53−7.56(m,2H),9.54(brs,1H).
Example 8 Synthesis of N- (9,13b-dihydro-1H-dibenzo [c, f] imidazo [1,5-a] azepin-3-yl) -carbamic acid methyl hydrochloride N- (9,13b-dihydro 0.38 g (1.3 mmol) of methyl 1H-dibenzo [c, f] imidazo [1,5-a] azepin-3-yl) -carbamate was added to 2.6 mL of methanol, and 1N hydrochloric acid 1 .3 mL was added and stirred at room temperature for 30 minutes. The solvent was distilled off, 10 mL of toluene was added to the residue, and the solvent was distilled off again. 3 mL of toluene and 1 mL of 2-propanol were added and stirred at room temperature for 30 minutes, and then the solid was collected by filtration. The filter cake was washed with a toluene / 2-propanol mixture (10: 1) and dried under reduced pressure at 50 ° C. to obtain 0.37 g of the title compound as a pale yellowish white solid (yield 85%).
1 H-NMR (DMSO-d6, 400 MHz): 3.61-3.70 (m, 2H), 3.74 (s, 3H), 4.54 (t, J = 10.4 Hz, 1H), 4 .59 (d, J = 14.2 Hz, 1H), 5.39 (t, J = 10.6 Hz, 1H), 7.17-7.20 (m, 1H), 7.21-7.28 ( m, 2H), 7.32-7.39 (m, 2H), 7.44-7.48 (m, 1H), 7.53-7.56 (m, 2H), 9.54 (brs, 1H).

実施例9 3−アミノ−9,13b−ジヒドロ−1H−ジベンゾ[c,f]イミダゾ[1,5−a]アゼピン(エピナスチン,式(III))の合成
N−(9,13b−ジヒドロ−1H−ジベンゾ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸メチル 0.22g(0.70ミリモル)を6M 塩酸 3mLに加えて95℃で撹拌した。23時間後、6M 塩酸を1mL加えて95℃で8時間撹拌した。反応液を冷却し、50% 水酸化ナトリウム水溶液でpHを11とした後、クロロホルム 各15mLで3回抽出した。有機層を集めて飽和食塩水で洗浄し、硫酸ナトリウムで乾燥して濾過した。濾液を濃縮して、得られた残渣をカラムクロマトグラフィー(アミノシリカゲル,クロロホルム/メタノール=50:1)で精製して表題化合物 0.13gを白色の固体として得た(収率 73%)。
H−NMR(CDCl3,400MHz):3.50(d,J=14.1Hz,1H),3.55(t,J=10.3Hz,1H),4.11(t,J=10.2,8.8Hz,1H),4.65(d,J=14.0Hz,1H),5.07(t,J=9.4Hz,1H),6.98−7.01(m,1H),7.13−7.24(m,4H),7.28−7.32(m,1),7.35−7.40(m,2H).
Example 9 Synthesis of 3-amino-9,13b-dihydro-1H-dibenzo [c, f] imidazo [1,5-a] azepine (epinastine, formula (III)) N- (9,13b-dihydro-1H -0.22 g (0.70 mmol) of methyl dibenzo [c, f] imidazo [1,5-a] azepin-3-yl) -carbamate was added to 3 mL of 6M hydrochloric acid and stirred at 95 ° C. After 23 hours, 1 mL of 6M hydrochloric acid was added and stirred at 95 ° C. for 8 hours. The reaction solution was cooled, adjusted to pH 11 with 50% aqueous sodium hydroxide solution, and extracted three times with 15 mL each of chloroform. The organic layer was collected, washed with saturated brine, dried over sodium sulfate and filtered. The filtrate was concentrated, and the resulting residue was purified by column chromatography (amino silica gel, chloroform / methanol = 50: 1) to give 0.13 g of the title compound as a white solid (yield 73%).
1 H-NMR (CDCl3, 400 MHz): 3.50 (d, J = 14.1 Hz, 1H), 3.55 (t, J = 10.3 Hz, 1H), 4.11 (t, J = 10. 2,8.8 Hz, 1H), 4.65 (d, J = 14.0 Hz, 1H), 5.07 (t, J = 9.4 Hz, 1H), 6.98-7.01 (m, 1H) ), 7.13-7.24 (m, 4H), 7.28-7.32 (m, 1), 7.35-7.40 (m, 2H).

参考例5 N−(イミノメトキシメチル)カルバミン酸アリルの合成
O−メチルイソウレア塩酸塩 0.50g(4.5ミリモル)を水 4mLに溶解し、5℃に冷却した。ここにクロロギ酸アリル 0.60g(5.0ミリモル)を加え、さらに温度を5℃以下に保ちながら50%水酸化ナトリウム水溶液 1.09gを滴下した後、1,4−ジオキサン 2mLを加えて12時間攪拌した。ジクロロメタン 30mLを用いて抽出し、有機層を硫酸ナトリウムで乾燥して濾過した。溶媒を減圧留去して表題化合物 0.44gを無色の油状物質として得た(収率61%)。この化合物を精製することなく以下の反応に供した。
H−NMR(CDCl,400MHz),δ(ppm):3.84(s,3H),4.62(d,J=5.8Hz,2H),5.23(dd,J=10.4Hz,1.2Hz,1H),5.34(dd,J=17.2Hz,1.4Hz,1H),5.65(brs,1H),5.95−6.03(m,1H),8.25(brs,1H)
MS(m/z):159(M+H+
Reference Example 5 Synthesis of allyl N- (iminomethoxymethyl) carbamate 0.50 g (4.5 mmol) of O-methylisourea hydrochloride was dissolved in 4 mL of water and cooled to 5 ° C. To this, 0.60 g (5.0 mmol) of allyl chloroformate was added, and 1.09 g of 50% aqueous sodium hydroxide solution was added dropwise while keeping the temperature at 5 ° C. or lower, and then 2 mL of 1,4-dioxane was added to add 12 Stir for hours. Extraction was performed using 30 mL of dichloromethane, and the organic layer was dried over sodium sulfate and filtered. The solvent was distilled off under reduced pressure to obtain 0.44 g of the title compound as a colorless oily substance (yield 61%). This compound was subjected to the following reaction without purification.
1 H-NMR (CDCl 3 , 400 MHz), δ (ppm): 3.84 (s, 3H), 4.62 (d, J = 5.8 Hz, 2H), 5.23 (dd, J = 10. 4 Hz, 1.2 Hz, 1 H), 5.34 (dd, J = 17.2 Hz, 1.4 Hz, 1 H), 5.65 (brs, 1 H), 5.95-6.03 (m, 1 H), 8.25 (brs, 1H)
MS (m / z): 159 (M + H < + > )

実施例10 N−(9,13b−ジヒドロ−1H−ジベンゾ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸アリル(式(IVe))の合成 Example 10 Synthesis of N- (9,13b-dihydro-1H-dibenzo [c, f] imidazo [1,5-a] azepin-3-yl) -allylcarbamate (Formula (IVe))

Figure 2013151484
Figure 2013151484

5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミン 0.43g(1.9ミリモル)およびN−(イミノメトキシメチル)カルバミン酸アリル 0.30g(1.9ミリモル)をクロロホルム 4.2mLに溶解し、酢酸 0.14mL(2.5ミリモル)を加えて3.5時間還流した。反応液を冷却し、飽和重曹水にあけてクロロホルム各30mLで2回抽出した。有機層を集めて水で洗浄し、硫酸ナトリウムで乾燥し、濾過した。溶媒を減圧留去し、得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム/メタノール=100:1)で精製して表題化合物0.15gを黄色の油状物質として得た(単離収率24%)。
H−NMR(CDCl,400MHz),δ(ppm):3.49(d,14.2Hz,1H),3.63(t,10.4Hz,1H),4.20(t,9.2Hz,1H),4.55−4.58(m,2H),4.61(d,14.2Hz,1H),5.16(t,10.4Hz,1H),5.17(d,10.4Hz,1H),5.28(d,17.24Hz,1H),5.92−6.05(m,1H),6.97−7.00(m,1H),7.16−7.23(m,3H),7.24−7.31(m,3H),7.48(d,7.2Hz,1H),8.30(s,1H).
MS(m/z):334(M+H+).
5H-Dibenz [b, e] azepine-6,11-dihydro-6-methanamine 0.43 g (1.9 mmol) and allyl N- (iminomethoxymethyl) carbamate 0.30 g (1.9 mmol) were mixed with chloroform. It melt | dissolved in 4.2 mL, 0.14 mL (2.5 mmol) of acetic acid was added, and it recirculate | refluxed for 3.5 hours. The reaction solution was cooled, poured into a saturated aqueous sodium bicarbonate solution, and extracted twice with 30 mL each of chloroform. The organic layer was collected and washed with water, dried over sodium sulfate and filtered. The solvent was distilled off under reduced pressure, and the obtained residue was purified by column chromatography (silica gel, chloroform / methanol = 100: 1) to obtain 0.15 g of the title compound as a yellow oily substance (24% isolated yield). ).
1 H-NMR (CDCl 3 , 400 MHz), δ (ppm): 3.49 (d, 14.2 Hz, 1 H), 3.63 (t, 10.4 Hz, 1 H), 4.20 (t, 9. 2Hz, 1H), 4.55-4.58 (m, 2H), 4.61 (d, 14.2Hz, 1H), 5.16 (t, 10.4Hz, 1H), 5.17 (d, 10.4 Hz, 1H), 5.28 (d, 17.24 Hz, 1H), 5.92-6.05 (m, 1H), 6.97-7.00 (m, 1H), 7.16- 7.23 (m, 3H), 7.24-7.31 (m, 3H), 7.48 (d, 7.2Hz, 1H), 8.30 (s, 1H).
MS (m / z): 334 (M + H < + > ).

参考例6 N−(イミノメトキシメチル)カルバミン酸tert−ブチルの合成
O−メチルイソウレア塩酸塩 0.50g(4.5ミリモル)をDMF4mLに溶解し、2℃に冷却した。ここに炭酸カリウム2.06g(14.9ミリモル)を加え、さらに温度を2℃以下に保ちながら二炭酸ジ−tert−ブチル1.09gを加えて、64時間攪拌した。水30mLを加えた後、ジクロロメタン30mLを用いて抽出し、有機層を各30mLの水で2回、飽和食塩水で洗浄し、硫酸ナトリウムで乾燥して濾過した。溶媒を減圧留去して表題化合物0.52gを無色の油状物質として得た(収率66%)。この化合物を精製することなく以下の反応に供した。
1H−NMR(CDCl3,400MHz),δ(ppm):1.50(s,9H),3.83(s,3H).
MS(m/z):175(M+H+)
Reference Example 6 Synthesis of tert-butyl N- (iminomethoxymethyl) carbamate 0.50 g (4.5 mmol) of O-methylisourea hydrochloride was dissolved in 4 mL of DMF and cooled to 2 ° C. To this, 2.06 g (14.9 mmol) of potassium carbonate was added, and 1.09 g of di-tert-butyl dicarbonate was added while maintaining the temperature at 2 ° C. or lower, followed by stirring for 64 hours. After adding 30 mL of water, extraction was performed using 30 mL of dichloromethane, and the organic layer was washed twice with 30 mL of water and with saturated saline, dried over sodium sulfate, and filtered. The solvent was distilled off under reduced pressure to obtain 0.52 g of the title compound as a colorless oily substance (yield 66%). This compound was subjected to the following reaction without purification.
1H-NMR (CDCl3, 400 MHz), δ (ppm): 1.50 (s, 9H), 3.83 (s, 3H).
MS (m / z): 175 (M + H +)

実施例11 N−(9,13b−ジヒドロ−1H−ジベンゾ[c,f]イミダゾ[1,5−a]アゼピン−3−イル)−カルバミン酸tert−ブチル(式(IVf)の合成 Example 11 Synthesis of tert-butyl N- (9,13b-dihydro-1H-dibenzo [c, f] imidazo [1,5-a] azepin-3-yl) -carbamate (formula (IVf)

Figure 2013151484
5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミン 0.39g(1.72ミリモル)およびN−(イミノメトキシメチル)カルバミン酸tert−ブチル0.30g(1.7ミリモル)をクロロホルム4.0mLに溶解し、酢酸128μL(2.2ミリモル)を加えて4.5時間還流した。反応液を冷却し、飽和重曹水にあけてクロロホルム30mLで抽出した。有機層を水で洗浄し、硫酸ナトリウムで乾燥し、濾過した。溶媒を減圧留去し、得られた残渣をカラムクロマトグラフィー(シリカゲル、クロロホルム/メタノール=100:1)で精製して表題化合物0.17gを淡黄白色の固体として得た(単離収率28%)。
1H−NMR(CDCl3,400MHz),δ(ppm): 1.47(s,9H),3.47(d,14.2Hz,1H),3.60(dd,11.1Hz,8.8Hz,1H),4.16(t,9.1Hz,1H),4.62(d,14.2Hz,1H),5.09(dd,11.4Hz,9.0Hz,1H),6.95−7.00(m,1H),7.13−7.32(m,6H),7.51(dd,7.9Hz,1.0Hz,1H),8.42(brs,1H).
MS(m/z):350(M+H+).
Figure 2013151484
0.39 g (1.72 mmol) 5H-dibenz [b, e] azepine-6,11-dihydro-6-methanamine and 0.30 g (1.7 mmol) tert-butyl N- (iminomethoxymethyl) carbamate Was dissolved in 4.0 mL of chloroform, 128 μL (2.2 mmol) of acetic acid was added, and the mixture was refluxed for 4.5 hours. The reaction mixture was cooled, poured into saturated aqueous sodium hydrogen carbonate, and extracted with 30 mL of chloroform. The organic layer was washed with water, dried over sodium sulfate and filtered. The solvent was distilled off under reduced pressure, and the resulting residue was purified by column chromatography (silica gel, chloroform / methanol = 100: 1) to obtain 0.17 g of the title compound as a pale yellowish white solid (isolation yield 28). %).
1H-NMR (CDCl3, 400 MHz), δ (ppm): 1.47 (s, 9H), 3.47 (d, 14.2 Hz, 1H), 3.60 (dd, 11.1 Hz, 8.8 Hz, 1H), 4.16 (t, 9.1 Hz, 1 H), 4.62 (d, 14.2 Hz, 1 H), 5.09 (dd, 11.4 Hz, 9.0 Hz, 1 H), 6.95- 7.00 (m, 1H), 7.13-7.32 (m, 6H), 7.51 (dd, 7.9 Hz, 1.0 Hz, 1H), 8.42 (brs, 1H).
MS (m / z): 350 (M + H @ +).

参考例7 反応式Bの工程3の実験における分析方法
反応式Bの工程3の反応での高速液体クロマトグラフィー(HPLC)を用いた絶対定量法としては、以下の条件を用いて収率を求めた。
検出器: 紫外吸光検出器
検出波長: 220nm
カラム: イナートシルODS−3 内径 4.6mm、長さ 150mm(GLサイエンス製)
カラム温度: 40℃付近の一定温度
移動相: アセトニトリル 200mL、水 800mL、リン酸 0.4mL、およびトリエチルアミン 0.4mLの混合液
Reference Example 7 Analytical Method in Experiment of Step 3 of Reaction Formula B As an absolute quantitative method using high performance liquid chromatography (HPLC) in the reaction of Step 3 of Reaction Formula B, the yield is obtained using the following conditions. It was.
Detector: UV absorption detector Detection wavelength: 220 nm
Column: Inert Sil ODS-3 Inner Diameter 4.6 mm, Length 150 mm (GL Science)
Column temperature: Constant temperature mobile phase around 40 ° C .: Mixture of 200 mL acetonitrile, 800 mL water, 0.4 mL phosphoric acid, and 0.4 mL triethylamine

実施例12 {イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸メチル(式(VIa))の合成 Example 12 Synthesis of {imino [N- (5H-dibenz [b, e] azepin-6-yl) methylamino] methyl} methyl carbamate (Formula (VIa))

Figure 2013151484
Figure 2013151484

5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミンフマル酸塩 1.02g(3.0ミリモル)およびN−(イミノメトキシメチル)カルバミン酸メチル 0.44g(3.3ミリモル)をN,N−ジメチルホルムアミド3.3mL(5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミンフマル酸塩に対して3.3倍体積)に加えて50℃で21時間撹拌した。続いて、反応液にトルエン 10mL、炭酸水素ナトリウム 0.52gおよび水 10mLを添加し、有機層を分離した。水層をトルエン 10mLで再び抽出し、得られたトルエン層を合一して室温で静置した。析出した固体を濾取し、風乾して微黄色の固体 0.52gを得た(収率51%)。この化合物のHPLC純度は97%であった。
H−NMR(CDCl3,400MHz):3.59−3.78(m,2H),3.65(s,3H),4.09(m,2H),4.80(brs,1H),6.64(d,J=7.8Hz,1H),6.73−6.77(m,1H),6.99−7.07(m,3H),7.16−7.26(m,3H).
5H-Dibenz [b, e] azepine-6,11-dihydro-6-methanamine fumarate 1.02 g (3.0 mmol) and methyl N- (iminomethoxymethyl) carbamate 0.44 g (3.3 Mmol) is added to 3.3 mL of N, N-dimethylformamide (3.3 times volume with respect to 5H-dibenz [b, e] azepine-6,11-dihydro-6-methanamine fumarate) at 50 ° C. For 21 hours. Subsequently, 10 mL of toluene, 0.52 g of sodium hydrogen carbonate and 10 mL of water were added to the reaction solution, and the organic layer was separated. The aqueous layer was extracted again with 10 mL of toluene, and the resulting toluene layers were combined and allowed to stand at room temperature. The precipitated solid was collected by filtration and air-dried to obtain 0.52 g of a slightly yellow solid (yield 51%). The HPLC purity of this compound was 97%.
1 H-NMR (CDCl 3, 400 MHz): 3.59-3.78 (m, 2H), 3.65 (s, 3H), 4.09 (m, 2H), 4.80 (brs, 1H), 6.64 (d, J = 7.8 Hz, 1H), 6.73-6.77 (m, 1H), 6.99-7.07 (m, 3H), 7.16-7.26 (m , 3H).

実施例13 {イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸メチル(式(VIa))の合成(反応条件の検討)
実施例12と同様の操作を行ない、種々の溶媒および溶媒量の検討を行なった。反応終了後に反応液を約30mg抜き出し、HPLC分析を行った。検討条件と、HPLC分析による収率は表1の通りである。
Example 13 Synthesis of {imino [N- (5H-dibenz [b, e] azepin-6-yl) methylamino] methyl} carbamate methyl (formula (VIa)) (research of reaction conditions)
The same operation as in Example 12 was performed, and various solvents and solvent amounts were examined. After completion of the reaction, about 30 mg of the reaction solution was extracted and subjected to HPLC analysis. The examination conditions and the yield by HPLC analysis are as shown in Table 1.

Figure 2013151484
Figure 2013151484

実施例14 {イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸メチル(式(VIa))の合成
5H−ジベンズ[b,e]アゼピン−6,11−ジヒドロ−6−メタンアミンフマル酸塩 1.02g(3.0ミリモル)およびN−(イミノメトキシメチル)カルバミン酸メチル 0.44g(3.3ミリモル)をジメチルスルホキシド 1.1mLに加えて40℃で22時間撹拌した。この反応液を約30mg抜き出しHPLC分析したところ、目的物の収率は94%であった。
Example 14 Synthesis of {imino [N- (5H-dibenz [b, e] azepin-6-yl) methylamino] methyl} carbamate (Formula (VIa)) 5H-Dibenz [b, e] azepine-6 , 11-dihydro-6-methanamine fumarate 1.02 g (3.0 mmol) and methyl N- (iminomethoxymethyl) carbamate 0.44 g (3.3 mmol) were added to 1.1 mL dimethyl sulfoxide. Stir at 40 ° C. for 22 hours. About 30 mg of this reaction solution was extracted and analyzed by HPLC. The yield of the target product was 94%.

実施例15 {イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸アリル(式(VIb))の合成 Example 15 Synthesis of {imino [N- (5H-dibenz [b, e] azepin-6-yl) methylamino] methyl} carbamate allyl (formula (VIb))

Figure 2013151484
Figure 2013151484

実施例12と同様の操作を行ない、N−(イミノメトキシメチル)カルバミン酸メチルの代わりにN−(イミノメトキシメチル)カルバミン酸アリルを用いて、表題化合物を得た。
H−NMR(CDCl,400MHz),δ(ppm):3.50−3.77(m,2H),3.90−4.28(m,3H),4.55(d,5.6Hz,2H),4.78(s,1H),5.15(d,10.9Hz,1H),5.29(dd,17.2Hz,1.3Hz,1H),5.89−5.99(m,1H),6.64(d,7.7Hz,1H),6.76(t,7.3Hz,1H),7.00−7.08(m,3H),7.15−7.23(m,3H).
MS(m/z):351(M+H+).
The same operation as in Example 12 was performed, and the title compound was obtained using allyl N- (iminomethoxymethyl) carbamate instead of methyl N- (iminomethoxymethyl) carbamate.
1 H-NMR (CDCl 3 , 400 MHz), δ (ppm): 3.50-3.77 (m, 2H), 3.90-4.28 (m, 3H), 4.55 (d, 5. 6 Hz, 2H), 4.78 (s, 1H), 5.15 (d, 10.9 Hz, 1H), 5.29 (dd, 17.2 Hz, 1.3 Hz, 1H), 5.89-5. 99 (m, 1 H), 6.64 (d, 7.7 Hz, 1 H), 6.76 (t, 7.3 Hz, 1 H), 7.00-7.08 (m, 3 H), 7.15- 7.23 (m, 3H).
MS (m / z): 351 (M + H < + > ).

また、表2に対応する原料(II)を用いて実施例12と同様の方法を行ない、式(VI):

Figure 2013151484
で表される表2の化合物を得ることができる。 Further, the same method as in Example 12 was performed using the raw material (II) corresponding to Table 2, and the formula (VI):
Figure 2013151484
The compound of Table 2 represented by these can be obtained.

Figure 2013151484
Figure 2013151484

実施例16 {イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸メチル(式(VIa))からエピナスチン塩酸塩の合成
{イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸メチル(式(VIa))1.02g(3.0ミリモル)にトルエン10mLを加えて90℃に加熱した。撹拌しながら、ここに酢酸0.43mLをシリンジポンプを用い、23時間かけて滴下した。反応液を放冷後、5℃以下に冷却して3日間静置して析出した固体を濾取して0.65gの固体を得た。この物質と水1mLおよび10規定塩酸0.24mLを混合し、溶媒を減圧留去した。残渣に酢酸エチル15mLおよびメタノール0.6mLを加えて80℃に加熱して析出した固体を濾取し、減圧乾燥して表題化合物 0.42gを得た(収率49%)。この物質の融点は273〜274℃であり、文献値と一致した。
Example 16 Synthesis of epinastine hydrochloride from {imino [N- (5H-dibenz [b, e] azepin-6-yl) methylamino] methyl} carbamate methyl (formula (VIa)) {imino [N- (5H -Dibenz [b, e] azepin-6-yl) methylamino] methyl} carbamate (formula (VIa)) 1.02 g (3.0 mmol) was added 10 mL of toluene and heated to 90 ° C. Acetic acid 0.43mL was dripped here over 23 hours using the syringe pump, stirring. The reaction solution was allowed to cool, then cooled to 5 ° C. or lower and allowed to stand for 3 days. The precipitated solid was collected by filtration to obtain 0.65 g of a solid. This material was mixed with 1 mL of water and 0.24 mL of 10N hydrochloric acid, and the solvent was distilled off under reduced pressure. 15 mL of ethyl acetate and 0.6 mL of methanol were added to the residue and heated to 80 ° C., and the precipitated solid was collected by filtration and dried under reduced pressure to obtain 0.42 g of the title compound (yield 49%). The melting point of this material was 273-274 ° C., consistent with literature values.

実施例17 {イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸メチル(式(VIa))からエピナスチンの合成
{イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸メチル(式(VIa))97mg(0.3ミリモル)にトルエン10mLと表3記載の酸1モル当量を加えて70℃に加熱し、16時間攪拌した。この反応液を約30mg抜き出しHPLC分析を行なった。結果を表3に示す。
Example 17 Synthesis of epinastine from methyl {imino [N- (5H-dibenz [b, e] azepin-6-yl) methylamino] methyl} carbamate (formula (VIa)) {imino [N- (5H-dibenz To 97 mg (0.3 mmol) of [b, e] azepine-6-yl) methylamino] methyl} carbamate (formula (VIa)) was added 10 mL of toluene and 1 molar equivalent of the acid shown in Table 3, and the mixture was heated to 70 ° C. Heat and stir for 16 hours. About 30 mg of this reaction solution was extracted and subjected to HPLC analysis. The results are shown in Table 3.

Figure 2013151484
Figure 2013151484

Claims (18)

式(I):
Figure 2013151484
で表されるジアミン化合物あるいはその塩と、式(II):
Figure 2013151484
(式中、Rはアルキル基、アルケニル基、アルキニル基、あるいはアリール基を表し、Rはアルキル基、アルケニル基、アルキニル基、アリール基、アルコキシ基、アルケニルオキシ基、アルキニルオキシ基、あるいはアリールオキシ基を表す)で表されるイソウレア化合物を反応させることを含む、式(III):
Figure 2013151484
で表されるエピナスチンあるいはその塩の製造方法。
Formula (I):
Figure 2013151484
A diamine compound or a salt thereof represented by formula (II):
Figure 2013151484
(Wherein R 1 represents an alkyl group, an alkenyl group, an alkynyl group, or an aryl group, and R 2 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, an alkenyloxy group, an alkynyloxy group, or an aryl group) Comprising reacting an isourea compound represented by formula (III):
Figure 2013151484
The manufacturing method of epinastine or its salt represented by these.
式(I):
Figure 2013151484
で表されるジアミン化合物あるいはその塩と、式(II):
Figure 2013151484
(式中、Rはアルキル基、アルケニル基、アルキニル基、あるいはアリール基を表し、Rはアルキル基、アルケニル基、アルキニル基、アリール基、アルコキシ基、アルケニルオキシ基、アルキニルオキシ基、あるいはアリールオキシ基を表す)で表されるイソウレア化合物を酸の存在下で反応させて式(IV):
Figure 2013151484
で表されるN−保護エピナスチン化合物(式中、Rは式(II)と同様である)を得、さらに保護基を除去して式(III):
Figure 2013151484
で表されるエピナスチンあるいはその塩に変換することからなる、エピナスチンおよびその塩の請求項1に記載の製造方法。
Formula (I):
Figure 2013151484
A diamine compound or a salt thereof represented by formula (II):
Figure 2013151484
(Wherein R 1 represents an alkyl group, an alkenyl group, an alkynyl group, or an aryl group, and R 2 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, an alkenyloxy group, an alkynyloxy group, or an aryl group) (Representing an oxy group) is reacted with an isourea compound represented by formula (IV) in the presence of an acid:
Figure 2013151484
N-protected epinastine compound represented by the formula (wherein R 2 is the same as in formula (II)), and further the protective group is removed to obtain formula (III):
Figure 2013151484
The manufacturing method of Claim 1 which consists of converting to the epinastine or its salt represented by these.
式(IV)で表されるN−保護エピナスチン化合物のRがアルコキシ基である請求項2に記載の製造方法。 The production method according to claim 2, wherein R 2 of the N-protected epinastine compound represented by the formula (IV) is an alkoxy group. 式(IV)で表されるN−保護エピナスチン化合物のRがメトキシ基、エトキシ基、あるいはベンジルオキシ基である請求項3に記載の製造方法。 The production method according to claim 3, wherein R 2 of the N-protected epinastine compound represented by the formula (IV) is a methoxy group, an ethoxy group, or a benzyloxy group. 式(IV)で表されるN−保護エピナスチン化合物のRがフェニル基である請求項2に記載の製造方法。 The production method according to claim 2, wherein R 2 of the N-protected epinastine compound represented by the formula (IV) is a phenyl group. 式(I)で表されるジアミン化合物がそのフマル酸塩である請求項2に記載の製造方法。 The production method according to claim 2, wherein the diamine compound represented by the formula (I) is a fumarate thereof. 反応に用いる酸がカルボン酸である請求項2に記載の製造方法。 The production method according to claim 2, wherein the acid used in the reaction is a carboxylic acid. 式(IV):
Figure 2013151484
で表される、Rがアルキル基、アルケニル基、アルキニル基、アリール基、アルコキシ基、アルケニルオキシ基、アルキニルオキシ基、あるいはアリールオキシ基であるN−保護エピナスチン化合物およびその塩。
Formula (IV):
Figure 2013151484
And an N-protected epinastine compound and a salt thereof, wherein R 2 is an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, an alkenyloxy group, an alkynyloxy group, or an aryloxy group.
がアルコキシ基である請求項8に記載のN−保護エピナスチン化合物およびその塩。 The N-protected epinastine compound and a salt thereof according to claim 8, wherein R 2 is an alkoxy group. N−(9,13b−ジヒドロ−1H−ジベンゾ[c,f]イミダズ[1,5−a]アゼピン−3−イル)−カルバミン酸メチルおよびその塩。 N- (9,13b-dihydro-1H-dibenzo [c, f] imidaz [1,5-a] azepin-3-yl) -methyl carbamate and salts thereof. 式(V):
Figure 2013151484
(式中、Xは酸を表す)で表されるジアミン化合物の塩と、式(II):
Figure 2013151484
(式中、Rはアルキル基、アルケニル基、アルキニル基、あるいはアリール基を表し、Rはアルキル基、アルケニル基、アルキニル基、アリール基、アルコキシ基、アルケニルオキシ基、アルキニルオキシ基、あるいはアリールオキシ基を表す)で表されるイソウレア化合物を反応させて式(VI):
Figure 2013151484
で表されるイソウレア付加体(式中、Rは式(II)と同様である)を得、さらに酸で処理して式(III):
Figure 2013151484
で表されるエピナスチンあるいはその塩に変換することからなる、エピナスチンおよびその塩の請求項1に記載の製造方法。
Formula (V):
Figure 2013151484
(Wherein X represents an acid) a salt of a diamine compound represented by formula (II):
Figure 2013151484
(Wherein R 1 represents an alkyl group, an alkenyl group, an alkynyl group, or an aryl group, and R 2 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, an alkenyloxy group, an alkynyloxy group, or an aryl group) An isourea compound represented by formula (VI):
Figure 2013151484
(Wherein R 2 is the same as in formula (II)), and further treated with an acid to give formula (III):
Figure 2013151484
The manufacturing method of Claim 1 which consists of converting to the epinastine or its salt represented by these.
式(VI)で表されるイソウレア付加体のRがアルコキシ基およびアルケニルオキシ基である請求項11に記載の製造方法。 The production method according to claim 11, wherein R 2 of the isourea adduct represented by the formula (VI) is an alkoxy group or an alkenyloxy group. 式(VI)で表されるイソウレア付加体のRがメトキシ基、エトキシ基、ベンジルオキシ基あるいはアリルオキシ基である請求項12に記載の製造方法。 The production method according to claim 12, wherein R 2 of the isourea adduct represented by the formula (VI) is a methoxy group, an ethoxy group, a benzyloxy group, or an allyloxy group. 式(V)で表されるジアミン化合物の塩がフマル酸塩である請求項11に記載の製造方法。 The production method according to claim 11, wherein the salt of the diamine compound represented by the formula (V) is a fumarate. 環化反応および保護基の除去に用いる酸がカルボン酸である請求項11に記載の製造方法。 The production method according to claim 11, wherein the acid used for the cyclization reaction and removal of the protecting group is a carboxylic acid. 式(VI):
Figure 2013151484
で表される、Rがアルキル基、アルケニル基、アルキニル基、アリール基、アルコキシ基、アルケニルオキシ基、アルキニルオキシ基、あるいはアリールオキシ基であるイソウレア付加体。
Formula (VI):
Figure 2013151484
An isourea adduct wherein R 2 is an alkyl group, alkenyl group, alkynyl group, aryl group, alkoxy group, alkenyloxy group, alkynyloxy group, or aryloxy group.
がアルコキシ基である請求項16に記載のイソウレア付加体。 The isourea adduct according to claim 16, wherein R 2 is an alkoxy group. {イミノ[N−(5H−ジベンズ[b,e]アゼピン−6−イル)メチルアミノ]メチル}カルバミン酸メチル。 {Imino [N- (5H-dibenz [b, e] azepin-6-yl) methylamino] methyl} methyl carbamate.
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