Benzylic Arylation of 2-Methyl-5-membered Heterocycles Using TMP-Bases
摘要:
A new general Pd-catalyzed arylation of various 2-methyl-5-membered heterocycles is reported. This novel method requires Li-, Mg-, or Zn-TMP bases and allows selective metalation of the benzylic position. Subsequent Negishi cross-coupling provides the corresponding arylated heterocycles.
Iridium‐Catalyzed Asymmetric Allylic Substitution of Methyl Azaarenes
作者:Xi‐Jia Liu、Wen‐Yun Zhang、Chao Zheng、Shu‐Li You
DOI:10.1002/anie.202200164
日期:2022.5.9
An iridium-catalyzedasymmetricallylic substitution of a variety of methyl azaarenes, including (benzo)thiazole, oxazole, benzoimidazole, pyridine, and (iso)quinoline, is described. The corresponding chiral azaarene derivatives are afforded in good yields with high enantioselectivity (up to 96 % yield and 99 % ee).
Benzylic Arylation of 2-Methyl-5-membered Heterocycles Using TMP-Bases
作者:Stéphanie Duez、Andreas K. Steib、Paul Knochel
DOI:10.1021/ol300517q
日期:2012.4.20
A new general Pd-catalyzed arylation of various 2-methyl-5-membered heterocycles is reported. This novel method requires Li-, Mg-, or Zn-TMP bases and allows selective metalation of the benzylic position. Subsequent Negishi cross-coupling provides the corresponding arylated heterocycles.
TMPZnOPiv•LiCl: A New Base for the Preparation of Air-Stable Solid Zinc Pivalates of Sensitive Aromatics and Heteroaromatics
作者:Christos I. Stathakis、Sophia M. Manolikakes、Paul Knochel
DOI:10.1021/ol400242r
日期:2013.3.15
A wide range of aryl and heteroaryl zinc pivalates bearing sensitive functionalities were prepared by selectivemetalation using TMPZnOPiv•LiCl, a new hindered zinc amide base. The new zincreagents are easy-to-handle solids, which maintain their activity almost entirely (>95%) after 4 h of air exposure and smoothly undergo Negishicross-couplings and reactions with various electrophiles such as Cu(I)-catalyzed