METHOD FOR MANUFACTURING A 6-SUBSTITUTED 1-METHYL-1H-BENZIMIDAZOLE DERIVATIVE AND AN INTERMEDIATE OF SAID METHOD
申请人:Ikeuchi Yutaka
公开号:US20120238759A1
公开(公告)日:2012-09-20
A method for manufacturing a 6-substituted 1-methyl-1H-benzimidazole derivative represented by the formula (IV)
wherein R
3
represents a hydrogen atom or a C
1
-C
4
alkyl group. A 4-substituted N
2
-methylbenzene-1,2-diamine derivative is prepared from a particular 5-substituted N-methyl-2-nitroaniline derivative, subsequently reacting the resulting compound with 4-[(2,4-dioxo-1,3-thiazolidin-5-yl)methyl]phenoxy}acetic acid or an acid chloride or a mixed acid anhydride thereof, and subsequently subjecting the resulting compound to intramolecular dehydration condensation. A compound of the formula (II)
wherein R
1
represents a hydrogen atom, a C
1
-C
4
alkyl group, or a protective group for the nitrogen atom, and R
2
represents a hydrogen atom or a protective group for the nitrogen atom is prepared and used as an intermediate.
一种制备式(IV)的6-取代1-甲基-1H-苯并咪唑衍生物的方法,其中R3代表氢原子或C1-C4烷基基团。首先从特定的5-取代N-甲基-2-硝基苯胺衍生物制备4-取代N2-甲基苯-1,2-二胺衍生物,随后将所得化合物与4-[(2,4-二氧杂环己烷-1,3-二酮-5-基)甲基]苯氧}乙酸或其酸氯或混合酸酐反应,然后对所得化合物进行分子内脱水缩合反应。制备并使用式(II)的化合物作为中间体,其中R1代表氢原子、C1-C4烷基或氮原子的保护基团,R2代表氢原子或氮原子的保护基团。