Intermolecular and Intramolecular Ketone–Nitrile Reductive Coupling Reactions Promoted by TiCl4–Sm System
摘要:
The intermolecular and intramolecular reductive coupling reactions of ketones with nitriles have been successfully promoted by low-valent titanium prepared by the TiCl4-Sm system. Substituted ketones, monocyclic alpha-amino alcohols and monocyclic amines composed of a number of substitution patterns have been prepared in good yields at room or THF reflux temperature under neutral conditions. The procedure can avoid over reduction of the resulting of ketones, alpha-amino alcohols or amines. The crystal structures of two monocyclic alpha-amino alcohols are reported. (C) 2000 Elsevier Science Ltd. All rights reserved.
A highly efficient strategy for the kinetic resolution of Michael adducts was realized using a chiral N‐heterocyclic carbene catalyst. The kinetic resolution provides a new convenient route to single diastereomers of cyclohexenes and Michael adducts in good yields with high enantiomeric excesses (up to 99 % ee with a selectivity factor of up to 458). This “two flies with one swat” concept allows the
One‐Pot Sequential Synthesis of Fused Isoquinolines via Intramolecular Cyclization/Annulation and their Photophysical Investigation
作者:Amitava Rakshit、Prasenjit Sau、Subhendu Ghosh、Bhisma K. Patel
DOI:10.1002/adsc.201900543
日期:2019.8.21
1‐a]isoquinoline‐3‐carbonitrile. This one‐pot process is associated with the formation of one C−C, two C−N, two C=C and a C=O bonds. The final synthesis is a four‐step process consisting of selective hydrolysis of a cyano group to an amide, dehydrative cyclization of the amide to a cyclic amide, aromatization of the cyclic amide (2‐oxo‐1,2,3,4‐tetrahydropyridine moiety) to a 2‐oxo‐1,2‐dihydropyridine and finally
Samarium(II) iodide promoted novel reductive coupling reactions of ketones and nitriles
作者:Longhu Zhou、Yongmin Zhang、Daqing Shi
DOI:10.1016/s0040-4039(98)01984-4
日期:1998.11
The intramolecular and intermolecular reductivecoupling reaction of ketones-nitriles promoted by SmI2 were studied.
研究了SmI 2促进的酮腈的分子内和分子间还原偶联反应。
Samarium(II) Iodide-Promoted Intermolecular and Intramolecular Ketone-Nitrile Reductive Coupling Reactions
作者:Longhu Zhou、Yongmin Zhang、Daqing Shi
DOI:10.1055/s-2000-6220
日期:——
Samarium(II) iodide, a strong one-electron transfer reducing reagent, has been successfully utilized for the intermolecular and intramolecular reductive coupling reactions of ketones with nitriles. α-Hydroxy ketones, monocyclic, fused bicyclic α-hydroxy ketones and monocyclic α-amino alcohols composed of a number of substitution patterns have been prepared in good yields at room temperature or reflux under neutral conditions. The procedure can avoid overreduction of the resulting of α-hydroxy ketones or α-amino alcohols. The crystal structures of monocyclic α-amino alcohols are reported.