Convenient Catalysed Spirocyclisation of 4-(2-Carboxyethyl)Phenols
作者:Zhong-Shi Zhou、Xue-Han He
DOI:10.3184/174751917x14840718425897
日期:2017.1
stoichiometric oxidant m-chloroperbenzoic acid, the oxidative spirocyclisation of 4-(2-carboxyethyl)phenols proceeded smoothly, providing the corresponding spirodienones in good yields. In this protocol, 1-iodopropane was first oxidised to hypoiodous acid, which then facilitated the spirocyclisation of the phenols.
Organoiodine-Catalyzed Oxidative Spirocyclization of Phenols using Peracetic Acid as a Green and Economic Terminal Oxidant
作者:Yutaka Minamitsuji、Daishi Kato、Hiromichi Fujioka、Toshifumi Dohi、Yasuyuki Kita
DOI:10.1071/ch09148
日期:——
The use of peraceticacid as a green and economical terminal oxidant in fluoroalcohol solvents could provide a practical iodoarene-catalyzed oxidation of phenols to give spirodienones. Acetic acid and water were the only co-products and waste, and thus this catalytic approach utilizing fluoroalcohol media could simplify the reaction workup procedure for product isolation.
Auxiliary‐Free Remote Dearomatizative Nitrenoid Transfer for Enantioselective Construction of Spirolactams
作者:Bo‐Han Zhu、Wen‐Ting Guo、Qing Sun、Peng‐Cheng Qian、Long‐Wu Ye、Long Li
DOI:10.1002/adsc.202101189
日期:2022.1.18
An Ir-catalyzed remotedearomatizative amidation for the enantioselectiveconstruction of chiral spirolactams in 70–93% yield with 81–96% ee was developed. This protocol represented a more atom-economical approach to chiral spirolactams via Ir-catalyzed nitrenoidtransfer without the introduction of a traceless O-silyl achiral auxiliary.
开发了一种 Ir 催化的远程脱芳构酰胺化,用于手性螺内酰胺的对映选择性构建,产率为 70-93%,ee 为 81-96%。该协议代表了一种更原子经济的手性螺内酰胺方法,通过 Ir 催化的 nitrenoid 转移而无需引入无痕 O-甲硅烷基非手性助剂。
1-hydroxy naphthyl alkanoic acids and certain salts thereof