Stereoselective Synthesis, Synthetic and Pharmacological Application of Monoterpene-Based 1,2,4- and 1,3,4-Oxadiazoles
作者:Tímea Gonda、Péter Bérdi、István Zupkó、Ferenc Fülöp、Zsolt Szakonyi
DOI:10.3390/ijms19010081
日期:——
produced α,β-dihydroxy 1,2,4-oxadiazoles. Pinane-based 1,3,4-oxadiazoles were obtained similarly from acids by coupling with acyl hydrazines followed by POCl3-mediated dehydrative ring closure. In the case of the arane counterpart, the rearrangement of the constrained carane system occurred with the loss of chirality under the same conditions. Stereoselective dihydroxylation with OsO4/NMO produced α,β-dihydroxy
基于α,β-不饱和羧酸的立体异构合成基于单萜的1,2,4-和1,3,4-恶二唑衍生物的立体选择合成是通过将(-)-2-carene-3-aldehyde和市售(-)-myrtenal。1,2,4-氧杂二唑通过相应的O-酰基酰胺基肟中间体分两步制备,然后在温和的反应条件下进行氟化四丁基铵(TBAF)诱导的环化反应。在与OsO4 / NMO(N-甲基吗啉N-氧化物)系统高度立体定向反应中的立体选择性二羟基化反应产生了α,β-二羟基1,2,4-恶二唑。通过与酰基肼偶合,然后由POCl3介导的脱水闭环,类似地从酸中获得基于烷的1,3,4-恶二唑。如果是Arane对应者,在相同条件下,受限的烷烃体系发生重排,但手性下降。用OsO4 / NMO进行立体选择性二羟基化可生成α,β-二羟基1,3,4-恶二唑。制备的二醇作为手性催化剂用于二乙基锌对醛的对映选择性加成。通过MTT测定法在体外筛选所有化合物对四