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.
In this study, the rapid transformation of inexpensive phenols into polyfunctionalized cyclohexenones containing a phosphonate in one pot is described. Such systems readily obtained from simple aromatic compounds could open up a multitude of synthetic possibilities. For example, this scaffold was easily and stereoselectively transformed into the corresponding enol functionality in the same pot by the
PIFA-Mediated Dearomatizative Spirocyclization of Phenolic Biarylic Ketones via Oxidation and C–C Bond Cleavage
作者:Gui-Hua Zhao、Bi-Qing Li、Shuang-Shuang Wang、Man Liu、Yuan Chen、Bin Wang
DOI:10.1021/acs.joc.0c00971
日期:2020.7.17
The dearomatizing spirocyclization of phenolic biarylic ketones using PhI(OCOCF3)2 as oxidant is presented. The reaction affords various cyclohexadienones through C–Cbondcleavage under mild conditions. Mechanistic investigations reveal that an exocyclic enol ether acts as the key intermediate in the transformation.
Asymmetric synthesis of spirocyclic isobenzofuranones <i>via</i> a squaramide-catalysed sulfa-Michael desymmetrisation reaction
作者:Tamanna、Deepak Sharma、Pankaj Chauhan
DOI:10.1039/d3ob00126a
日期:——
Enantioselective synthesis of spirocyclohexenone isobenzofuranones has been achieved through an organocatalysed sulfa-Michael desymmetrisation reaction. A cinchona-derived squaramide effectively promotes the desymmetrisation of spirocyclic 2,5-cyclohexadienone isobenzofuranones via the controlled addition of various aryl thiols to generate two vicinal stereocenters with perfect diastereoselectivities