Palladium(II)-Catalyzed Regioselective Direct C2 Alkenylation of Indoles and Pyrroles Assisted by the<i>N</i>-(2-Pyridyl)sulfonyl Protecting Group
作者:Alfonso García-Rubia、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1002/anie.200902802
日期:2009.8.17
N‐(2‐pyridyl)sulfonyl group controls the direct PdII‐catalyzed alkenylation of indoles, affording the corresponding products in good yields and with complete regiocontrol at C2 (see scheme, DMA=dimethylacetamide). The protocol was also extended to pyrrole derivatives. The final reductive desulfonylation affords the C2‐substituted indoles and pyrroles in good yields.
Palladium-Catalyzed Intermolecular C-2 Alkenylation of Indoles Using Oxygen as the Oxidant
作者:Zhao-Lei Yan、Wen-Liang Chen、Ya-Ru Gao、Shuai Mao、Yan-Lei Zhang、Yong-Qiang Wang
DOI:10.1002/adsc.201300811
日期:2014.3.24
A general and efficient palladium‐catalyzed intermolecular direct C‐2 alkenylation of indolesusingoxygen as the oxidant has been developed. The reaction is of complete regio‐ and stereoselectivity. All products are E‐isomers at the C‐2‐position with no Z‐isomers and 3‐substituted products were detected.
Palladium-Catalyzed Intermolecular Dehydrogenative C-2 Pentenylation of Indoles with 2-Methyl-2-butene
作者:Guo-Qiang Zhang、Xiao-Xuan Wu、Bao-Yin Zhao、Meng-Yue Wang、Hong-Xia Zhang、Yong-Qiang Wang
DOI:10.1021/acs.orglett.4c00803
日期:——
natural products. Herein we report an unprecedented unusual C5 functionalization of indole regioselectively at the C-2-position enabled by a (2-pyridyl)sulfonyl-directing palladium-catalyzed dehydrogenative strategy with a bulk chemical 2-methyl-2-butene as a C5 source. Compared to typical C5 functionalization using pentenyl alcohols, carbonates, borates, or halides as the C5 source, the protocol not
五碳 (C 5 ) 单元是构成多种天然产品的基本构件。在此,我们报道了一种前所未有的不寻常的吲哚在 C-2 位的区域选择性 C 5官能化,这是通过 (2-吡啶基)磺酰基导向的钯催化脱氢策略以大宗化学品 2-甲基-2-丁烯作为 C 5实现的。来源。与典型的使用戊烯醇、碳酸酯、硼酸酯或卤化物作为C 5源的C 5官能化相比,该方案不仅具有低成本优势,而且具有原子和步骤经济性。
PdII-Catalysed CH Functionalisation of Indoles and Pyrroles Assisted by the Removable N-(2-Pyridyl)sulfonyl Group: C2-Alkenylation and Dehydrogenative Homocoupling
作者:Alfonso García-Rubia、Beatriz Urones、Ramón Gómez Arrayás、Juan Carlos Carretero
DOI:10.1002/chem.201001126
日期:2010.8.16
The easily installed and removed N‐(2‐pyridyl)sulfonyl group exerts complete C2 regiocontrol over the PdII‐catalysed CH alkenylation of indoles and pyrroles, affording the corresponding products in good isolated yields (typically ≥70 %). A remarkable feature of this catalyst system is that it tolerates a wide variety of substituted alkenes, including conjugated electron‐deficient alkenes, styrenes