PdII-Catalyzed Di-o-olefination of Carbazoles Directed by the Protecting N-(2-Pyridyl)sulfonyl Group
摘要:
Despite the significance of carbazole in pharmacy and material science, examples of the direct C-H functionalization of this privileged unit are quite rare. The N-(2-pyridyl)sulfonyl group enables the Pd-II-catalyzed ortho-olefination of carbazoles and related systems, acting as both a directing and readily removable protecting group. This method features ample structural versatility, affording typically the double ortho-olefination products (at Cl and C8) in satisfactory yields and complete regiocontrol. The application of this procedure to related heterocyclic systems, such as indoline, is also described.
Synthesis of Indolines via Pd(II)-Catalyzed Amination of C–H Bonds Using PhI(OAc)2 as the Bystanding Oxidant
摘要:
The Pd(II)-catalyzed intramolecular C-H amination of 2-pyridinesulfonyl-protected phenethylamine derivatives has been achieved using Phl(OAc)(2) as a bystanding oxidant, providing access to a variety of substituted indoline derivatives in good yields. The use of the 2-pyridlnesulfonyl protecting group allows for facile deprotection following C-H functionalization.
Palladium-catalyzed C-7 alkenylation of indolines using molecular oxygen as the sole oxidant
作者:Dong Yang、Shuai Mao、Ya-Ru Gao、Dong-Dong Guo、Shi-Huan Guo、Bin Li、Yong-Qiang Wang
DOI:10.1039/c5ra02245b
日期:——
A general and efficient method for the intermolecular direct C-7-selective C–H alkenylation of indolines using palladium(II) as the catalyst and molecularoxygen as the soleoxidant has been developed. The reaction showed complete regio- and stereoselectivity. All products were E-isomers at the C-7 position, and no Z-isomers or other position substituted products could be detected. The approach also
Pd<sup>II</sup>-Catalyzed Di-<i>o</i>-olefination of Carbazoles Directed by the Protecting <i>N</i>-(2-Pyridyl)sulfonyl Group
作者:Beatriz Urones、Ramón Gómez Arrayás、Juan Carlos Carretero
DOI:10.1021/ol400206k
日期:2013.3.1
Despite the significance of carbazole in pharmacy and material science, examples of the direct C-H functionalization of this privileged unit are quite rare. The N-(2-pyridyl)sulfonyl group enables the Pd-II-catalyzed ortho-olefination of carbazoles and related systems, acting as both a directing and readily removable protecting group. This method features ample structural versatility, affording typically the double ortho-olefination products (at Cl and C8) in satisfactory yields and complete regiocontrol. The application of this procedure to related heterocyclic systems, such as indoline, is also described.
Synthesis of Indolines via Pd(II)-Catalyzed Amination of C–H Bonds Using PhI(OAc)<sub>2</sub> as the Bystanding Oxidant
作者:Tian-Sheng Mei、Dasheng Leow、Han Xiao、Brian N. Laforteza、Jin-Quan Yu
DOI:10.1021/ol401246u
日期:2013.6.21
The Pd(II)-catalyzed intramolecular C-H amination of 2-pyridinesulfonyl-protected phenethylamine derivatives has been achieved using Phl(OAc)(2) as a bystanding oxidant, providing access to a variety of substituted indoline derivatives in good yields. The use of the 2-pyridlnesulfonyl protecting group allows for facile deprotection following C-H functionalization.