Synthesis of 2,6-disubstituted and 2,3,6-trisubstituted anilines
摘要:
A number of 2,6-disubstituted and 2,3,6-trisubstituted anilines have been prepared via the selective para dehalogenation of the corresponding anilines. Modification of the substituents on the amino nitrogen demonstrates that the selectivity is derived from steric rather than electronic effects. The effects of the choice of formate hydrogen donor, Pd catalyst, solvent, and temperature upon the efficiency and selectivity of the dehalogenation are discussed.
Rhodium(III)‐Catalyzed Direct C7‐Selective Alkenylation and Alkylation of Indoles with Maleimides
作者:Yaoguang Sheng、Yi Gao、Bingbing Duan、Mengxia Lv、Yao Chen、Mengjie Yang、Jianmin Zhou、Guang Liang、Zengqiang Song
DOI:10.1002/adsc.202101055
日期:2022.1.18
A versatile and efficient method for the coupling of maleimides and indoles at the C7-position has been established under Rh(III) catalysis. The present protocol was compatible with various functional groups, diverse 3-(indol-7-yl)maleimides and 3-(indol-7-yl)succinimides were obtained in moderate to excellent yields by switching reaction conditions. Moreover, this method further highlights the unique
Site-Selective δ-C(sp<sup>3</sup>
)−H Alkylation of Amino Acids and Peptides with Maleimides via a Six-Membered Palladacycle
作者:Bei-Bei Zhan、Ya Li、Jing-Wen Xu、Xing-Liang Nie、Jun Fan、Liang Jin、Bing-Feng Shi
DOI:10.1002/anie.201801445
日期:2018.5.14
report on the site‐selective δ‐C(sp3)−H alkylation of amino acids and peptides with maleimides via a kinetically less favored six‐membered palladacycle in the presence of more accessible γ‐C(sp3)−H bonds. Experimental studies revealed that C−H bond cleavage occurs reversibly and preferentially at γ‐methyl over δ‐methyl C−H bonds while the subsequent alkylation proceeds exclusively at the six‐membered
Process for the selective reduction of the 4-halogen in
申请人:Dow Elanco
公开号:US05089653A1
公开(公告)日:1992-02-18
Substituted 2-haloanilines are prepared from the correspondingly substituted 2,4-dichloro- or 2,4-dibromoanilines by selectively reducing a chloro or bromo substituent para to a protected amino group in the presence of the same halogen as an ortho substituent. The selective reductions are accomplished by protecting the amino function of the aniline with two protecting groups, e.g., as the diacetanilide or the succinimide.
Cascade hydroarylation/Diels–Alder cycloaddition of alkynylindoles with electron-deficient alkynes and alkenes
作者:Guang-Chao Feng、Jun-Chi Li、Xiang Huang、Ji-Kai Liu、Bin Wu、Jin-Ming Yang
DOI:10.1039/d3cc05210a
日期:——
cascade gold(I)-catalyzed hydroarylation of alkynylindoles and subsequent Diels–Alder cycloaddition with electron-deficient alkynes and alkenes is described. A variety of azepino-fused hydrocarbazoles and carbazoles were obtained in moderate to excellent yields. Key features of this methodology are low catalyst loadings, high regioselectivity, broad functional group tolerances, access to important
在此,描述了一种新型级联金( I )催化的炔吲哚加氢芳基化反应以及随后与缺电子炔烃和烯烃的狄尔斯-阿尔德环加成反应。以中等至优异的产率获得了多种氮杂环稠合氢咔唑和咔唑。该方法的主要特点是催化剂负载量低、区域选择性高、官能团耐受性广、可获得重要的杂环以及 100% 原子经济性。
Process for the selective reduction of the 4-halogen in 2,4-dihaloanilines