Diverse multisubstituted ortho-silylaryl triflates were efficiently synthesized from simple ortho-silylaryl triflates via iridium-catalyzed regioselective C–H borylation and subsequent deborylative functionalizations. An azidoaryne precursor synthesized by this method served as a useful bis-reactive platform molecule, thus demonstrating the utility of the method for preparing diverse aromatic compounds.
Benzyne 1,2,4-Trisubstitution and Dearomative 1,2,4-Trifunctionalization
作者:Jiarong Shi、Lianggui Li、Chunhui Shan、Zhonghong Chen、Liang Dai、Min Tan、Yu Lan、Yang Li
DOI:10.1021/jacs.1c04389
日期:2021.7.21
4-trifunctionalization of benzyne have been accomplished from sulfoxides bearing a penta-2,4-dien-1-yl moiety. These cascade transformations proceed through a benzyne insertion into the S═O bond and an uncommon regiospecific anionic [4,5]-sigmatropic rearrangement, furnishing a C–O, C–S, and C–C bond on the C1-, C2-, and C4-position of a benzene ring, respectively. This study showcases new cascade benzyne reaction
2-difunctionalized benzenes, the sites other than its formal triple bond remain silent in typical benzyne transformations. An unprecedented aryne 1,2,3,5-tetrasubstitution was realized from 3-silylbenzyne and aryl allyl sulfoxide, the mechanistic pathway of which includes a regioselective aryne insertion into the S═O bond, a [3,6]-sigmatropic rearrangement, and a thermal aromatic 1,3-silyl migration cascade.
such heterocycles is the (3 + 2) cycloaddition reaction of benzynes with 1,3-dipolar compounds. However, the reactions of unsymmetrically substituted benzynes generally show low selectivity and hence yield mixtures of two regioisomers. In this paper, we describe the synthesis of both regioisomers of multisubstituted benzo-fused azole derivatives such as benzotriazoles, 1H-indazoles, and benzo[d]isoxazoles