Concomitant selective dehydroxylation during the transformation of flavones into pyrazoles with hydrazine is determined by the A-ring substitution pattern and propensity to keto–enol tautomerization. The obtained pyrazoles show varied tyrosinase inhibition properties, including one nanomolar inhibitor.
在将
黄酮转化为
吡唑与
肼的过程中伴随的选择性脱羟基由 A 环取代模式和酮-烯醇互变异构的倾向决定。获得的
吡唑表现出不同的
酪氨酸酶抑制特性,包括一种纳摩尔
抑制剂。