Palladium-Catalysed Heteroannulation with Terminal Alkynes: a Highly Regio- and Stereoselective Synthesis of (Z)-3-Aryl(alkyl)idene Isoindolin-1-ones
摘要:
A highly regio- and stereoselective method for the synthesis of (Z)-3-aryl(alkyl)idene isoindolin-1-ones through palladium-copper catalysis is described. 2-Iodobenzamide 1 and its substituted derivatives 2-10 were reacted with terminal alkynes 11-19 in the presence of (PPh3)(2)PdCl2, CuI, and Et3N in DMF mostly at 80 degrees C for 16 h to yield the 2-alkynyl substituted benzamides 20-38, 40-45, 77 which could then be cyclised with NaOEt in EtOH to the 3-aryl(alkyl)idene isoindolin-1-ones 46-49, 51, 53-55, 57, 59-71, 73 and 75. In certain cases, the isoindolin-1-ones 50, 52, 56 and 58 could be directly obtained by the palladium-catalysed reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.
Manganese-Catalyzed [3 + 2] Cyclization of Ketones and Isocyanates via Inert C–H Activation
作者:Jiaqi Huo、Yunhui Yang、Congyang Wang
DOI:10.1021/acs.orglett.1c00857
日期:2021.5.7
manganacycles with isocyanates were first reported by Kaesz and Liebeskind in 1975 and 1990, respectively. The buildup of a closed manganese catalytic cycle for the reaction of ketones and isocyanates remains an unsolved problem. Herein, an unprecedented trio of Me2Zn/AlCl3/AgOTf is developed to build up manganese catalysis, which enables the [3 + 2] cyclization of ketones with isocyanates via inert C–H
media has emerged as a new facet of green chemistry. In this paper, a sulfone‐containing imidazolium‐based Brønsted acid ionic liquid was prepared and used as a recyclable acid catalyst. The ionic liquid catalyst enables the use of an industrially acceptable and environmentally benign solvent, butyl acetate, as the reaction medium. The ionic liquid/butyl acetate biphasic system was successfully utilized
A Highly Regio and Stereoselective Synthesis of (<i>Z</i>)-3-Aryl(alkyl)idene Isoindolin-1-ones via Palladium Catalyzed Annulation of Terminal Alkynes
作者:M. Khan、Nitya Kundu
DOI:10.1055/s-1997-1049
日期:——
o-Iodobenzamide or its N-substituted derivatives 4-10 and terminal alkynes 11-17 reacted in DMF in the presence of bis(triphenylphosphine)palladium(II)chloride, cuprous iodide and triethylamine leading to (Z)-3-arylidene isoindolin-1-ones (22, 24, 27 and 28) or o-alkynyl N-substituted benzamides (I). The latter could be cyclised with sodium in ethanol in a completely regio and stereoselective manner to (Z)-3-aryl(alkyl)idene isoindolin-1-ones 18-35.
Rhodium(III)-Catalyzed Amidation of Aryl Ketone<i>O</i>-Methyl Oximes with Isocyanates by CH Activation: Convergent Synthesis of 3-Methyleneisoindolin-1-ones
作者:Bing Zhou、Wei Hou、Yaxi Yang、Yuanchao Li
DOI:10.1002/chem.201204448
日期:2013.4.8
Going green! The rhodium(III)‐catalyzed annulation of arylketone O‐methyl oximes with isocyanates for the synthesis of 3‐methyleneisoindolin‐1‐ones is reported (see scheme). This reaction exhibits high regioselectivity, functional‐group tolerance, and broad substrate scope, without the use of additives or production of environmentally hazardous waste.
Synthesis of 3-alkylidene phthallmidines by reaction of isocyanates with ortho-manganated aromatic ketones.
作者:Lanny S. Liebeskind、Stacey A. Johnson、J.Stuart McCallum
DOI:10.1016/s0040-4039(00)97631-7
日期:1990.1
Heating ortho-manganated aromatic ketones and RNCO (R = Et, n-Pr, p-tolyl) in dioxane for 3 – 7 h leads to production of 3-alkylidene phthalimidines. The alkylidene phthalimidines derived from aliphatic isocyanates were unstable and were reduced to phthalimidines prior to purification and characterization.