The present invention lies in a process for producing a compound represented by the following formula [IV], which comprises the following steps (1) to (3), as well as in an intermediate therefor.
(1) A step which comprises reacting a compound represented by the following formula [I] with a compound represented by the following formula [VI] or with a mixture of a compound represented by the following formula [VII] and a compound represented by the following formula [VIII] to obtain a compound represented by the following formula [IX], and hydrolyzing the compound represented by the formula [IX] under acidic conditions to obtain a compound represented by the following formula [II].
(2) A step which comprises reacting the compound represented by the formula [II] with hydroxylamine to obtain a compound represented by the following formula [III].
(3) A step which comprises dehydrating the compound represented by the formula [III] to obtain a compound represented by the formula [IV].
1
(R
1
)(R
2
)N—CH(OR
3
)(OR
4
) [VI]
(CH
3
)
2
N—CH(OCH
3
)
2
[VII]
(R
1
)(R
2
)NH [VIII]
2
本发明涉及一种制备以下化合物的方法,该化合物由以下公式(IV)表示,包括以下步骤(1)至(3),以及其中间体。
(1)一步骤包括将以下公式(I)表示的化合物与以下公式(VI)表示的化合物或以下公式(VII)表示的化合物和以下公式(VIII)表示的化合物的混合物反应,以得到以下公式(IX)表示的化合物,并在酸性条件下
水解公式(IX)表示的化合物,以得到以下公式(II)表示的化合物。
(2)一步骤包括将公式(II)表示的化合物与
羟胺反应,以得到以下公式(III)表示的化合物。
(3)一步骤包括脱
水公式(III)表示的化合物,以得到以下公式(IV)表示的化合物。
1(R1)(R2)N—CH(OR3)(OR4) [VI](
CH3)2N—CH(O )2 [VII](R1)(R2)NH [VIII]