Methods for producing furfural-4-boronic acid by the reaction of furfural acetals (I), which are substituted by halogen in position 4, with boronic acid esters or anhydrides, by the subsequent metalation of compound (I) and the simultaneous or subsequent reaction with a boronic acid ester or anhydride to form an acetal-protected furfural-4-boronic acid ester. This product is subjected to acid hydrolysis to form furfural-4-boronic acid. In the formulae: X represents chlorine, bromine or iodine; R represents a branched, unbranched and/or cyclic, optionally substituted C
1
-C
20
alkyl group, an optionally substituted C
6
-C
12
aryl group or an optionally substituted C
3
-C
8
cycloalkyl group, the two groups R together can form a ring; R′, R″, R′″ independently of one another represent acylic or cyclic, branched or unbranched, optionally substituted C
1
-C
20
alkyl groups, or optionally substituted aryl groups, optionally two of the groups R′, R″ and R′″ together form a ring, or represent additional groups B(OR)
3
.
通过将4位卤素取代的
呋喃乙缩醛(I)与
硼酸酯或酸酐反应,随后对化合物(I)进行
金属化并同时或随后与
硼酸酯或酸酐反应,形成一个保护的
呋喃-4-
硼酸酯。该产物经过酸
水解可形成
呋喃-4-
硼酸。在公式中,X代表
氯,
溴或
碘;R代表支链,直链和/或环状,可选地取代的C1-C20烷基,可选地取代的C6-C12芳基或可选地取代的C3-C8环状烷基,两个R组合可以形成一个环; R',R'',R'''分别独立地表示无环或环状,支链或直链,可选地取代的C1-C20烷基,或可选地取代的芳基,可选地,R',R''和R'''中的两个组成一个环,或表示额外的B(OR)3基团。