Synthesis of 2,3-Fused Quinolines from 3-Substituted Quinoline 1-Oxides. Part III. Intramolecular Cyclization of Quinoline 1-Oxides Bearing Active Methylene Groups at the 3-Position in the Presence of Acetic Anhydride
摘要:
3-N-Alkylcyanoacetamidoquinoline 1-oxides (3a and 3c) react with Ac2O at room temperature in chloroform to afford 1-alkyl-3-cyano-4H-pyrrolo[3,2-b]quinolin-2-ones (4a and 4c). The cyclization of 3-N-alkylethoxycarbonylacetamidoquinoline 1-oxides (3b and 3d) occurs upon heating with Ac2O at 60-degrees-C. 3-(3,3-Dicyanopropoxy) quinoline 1-oxide (5) also cyclizes to the pyranoquinoline (6) when treated with Ac2O at room temperature in chloroform-DMF.
Synthesis of 2,3-Fused Quinolines from 3-Substituted Quinoline 1-Oxides. Part III. Intramolecular Cyclization of Quinoline 1-Oxides Bearing Active Methylene Groups at the 3-Position in the Presence of Acetic Anhydride
摘要:
3-N-Alkylcyanoacetamidoquinoline 1-oxides (3a and 3c) react with Ac2O at room temperature in chloroform to afford 1-alkyl-3-cyano-4H-pyrrolo[3,2-b]quinolin-2-ones (4a and 4c). The cyclization of 3-N-alkylethoxycarbonylacetamidoquinoline 1-oxides (3b and 3d) occurs upon heating with Ac2O at 60-degrees-C. 3-(3,3-Dicyanopropoxy) quinoline 1-oxide (5) also cyclizes to the pyranoquinoline (6) when treated with Ac2O at room temperature in chloroform-DMF.
primary alcohols with aryl and heteroaryl amines together with diols and amino alcohol derivatives. Notably, the catalytic protocol consisting of an earth-abundant and non-precious NiBr2/L1 system enables the transformations in the presence of hydroxyl, alkene, nitrile, and nitro functionalities. As a highlight, we have demonstrated the alkylation of diamine, intramolecular cyclization to N-heterocycles
A borrowinghydrogenstrategy for the palladium‐catalyzed dehydrativecoupling of aminoisoquinolines or aminoquinolines with benzylic alcohols by a water‐soluble π‐benzylpalladium(II) system has been developed.
Titanium-Catalyzed Selective <i>N</i>-Alkylation of Amines with Alcohols via Borrowing Hydrogen Methodology
作者:Rahul Upadhyay、Sushil K. Maurya
DOI:10.1021/acs.joc.3c01788
日期:2023.12.15
The N-alkylation of amines with alcohols using earth-abundant and nonprecious metal catalysts has gained considerable attention in the pharmaceutical industry. We described titanium-catalyzed synthetic protocol for N-alkylation of amines with alcohols via borrowing hydrogen or hydrogen autotransfer reactions. The methodology enables the selective monoalkylation of various substituted (hetero)aromatic
使用地球储量丰富的非贵金属催化剂,胺与醇的N-烷基化在制药工业中引起了相当大的关注。我们描述了通过借氢或氢自转移反应用醇对胺进行N-烷基化的钛催化合成方案。该方法能够以良好至优异的收率(高达 97% 的收率)对各种取代的(杂)芳香胺进行选择性单烷基化。地球丰富的金属催化的适用性和 32 N -烷基化胺的合成进一步证明了该协议的重要性。这项工作允许将钛基催化剂用于各种反应,以扩展催化领域的自然蓝图。