作者:Bojan Burja、Marijan Kočevar、Slovenko Polanc
DOI:10.1016/j.tet.2009.08.047
日期:2009.10
An efficient entry into pyrazol-3-ones is described starting from propenoic acids that were first transformed into the corresponding hydrazides. Oxidation of the hydrazides gave the diazenes and the latter cyclized to pyrazol-3-ones on treatment with ZrCl4. The methoxycarbonyl protection of the N-1 of the pyrazolone derivatives was easily removed under mild reaction conditions.
描述了从首先被转化成相应的酰肼的丙烯酸开始有效地进入吡唑-3-酮。酰肼的氧化产生了二氮烯,并且在用ZrCl 4处理时将其环化成吡唑-3-酮。在温和的反应条件下,容易除去吡唑啉酮衍生物的N-1的甲氧基羰基保护基。