申请人:Burroughs Wellcome Co.
公开号:US03933807A1
公开(公告)日:1976-01-20
A process for the preparation of a cyanophenol of formula (I) ##SPC1## wherein Z is a substituent in the 4- or 6-position with respect to the hydroxy group, characterized in that cyanide ions are reacted in a dipolar aprotic solvent with a nitrobenzene of formula (II) ##SPC2## wherein Z has the same value as in formula (I) and is a group, other than a nitro group, known to withdraw electrons in substitution reactions and which does not contain a proton capable of ionizing under the defined reaction conditions if such ionization would inhibit the electron-withdrawing effect of the group Z. In formula (I) and (II) the benzene ring is optionally substituted by one or more non electron-withdrawing groups, or by one or more electron-withdrawing groups provided that such electron-withdrawing groups are in positions other than the 4- and 6-positions with respect to the hydroxy group. The compounds of formula (I) are of value in being readily hydrolysed to the corresponding salicylic acids of formula (III) ##SPC3## certain of which have been described in the literature as possessing a variety of pharmacological properties.
一种制备式(I)的氰苯酚的方法##SPC1##其中Z是相对于羟基的4-或6-位置的取代基,在无水极性溶剂中,氰离子与式(II)的硝基苯反应,##SPC2##其中Z的值与式(I)中的相同,并且是一种已知在取代反应中吸引电子的基团,但不含在定义的反应条件下具有离子化能力的质子,如果这种离子化会抑制基团Z的吸电子效应。在式(I)和(II)中,苯环可以选择性地被一个或多个非吸电子的基团取代,或者被一个或多个吸电子的基团取代,前提是这种吸电子的基团位于相对于羟基的4-和6-位置以外。式(I)的化合物具有价值,因为它们很容易水解成式(III)的相应水杨酸##SPC3##其中一些已经在文献中被描述为具有各种药理特性。