A palladium-catalyzed synthesis of (hetero)aryl-substituted imidazoles from aryl halides, imines and carbon monoxide
作者:Jevgenijs Tjutrins、Bruce A. Arndtsen
DOI:10.1039/c6sc04371b
日期:——
We describe here a tandem catalytic route to prepare imidazoles in a single operation from aryliodides, imines and CO. The reaction involves a catalytic carbonylation of aryl halides with imines to form 1,3-dipoles, which undergo spontaneous 1,3-dipolar cycloaddition. Overall, this offers an alternative to couplingreactions to construct the (hetero)aryl-imidazole motif, where variation of the building
Lithium acetate-catalyzed Mannich-type reaction between trimethylsilylenolates and aldimines proceeded smoothly in dry or even in a water-containing DMF to afford the corresponding β-amino carbonyl compounds in good to high yields under mild conditions.
The catalytic asymmetricarylation of pyridylimines was developed. A range of pyridylimines reacted with arylboronic acids under rhodium catalysis to produce pyridine-incorporating chiral diarylmethylamines in 46% to 99% yield with 90:10 to 99.5:0.5 er, thus providing a method for the preparation of these important chiral pharmacophores.
开发了吡啶亚胺的催化不对称芳基化。一系列吡啶亚胺在铑催化下与芳基硼酸反应,以 46% 至 99% 的收率和 90:10 至 99.5:0.5 er 生成含有吡啶的手性二芳基甲胺,从而为这些重要的手性药效团的制备提供了一种方法。
Photoredox-Catalyzed Synthesis of β-Amino Alcohols: Hydroxymethylation of Imines with α-Silyl Ether as Hydroxymethyl Radical Precursor
作者:Arjun Gontala、Hyunho Huh、Sang Kook Woo
DOI:10.1021/acs.orglett.2c03633
日期:2023.1.13
alcohols using two simple starting materials. Herein, we present a novel method for a divergent synthesis of β-amino ethers and β-amino alcohols in a sequential one-pot protocol under high-efficiency, mild, and metal- or metal-free conditions. Especially, TMSCH2OPMP was developed as a synthetic equivalent of α-hydroxymethyl radical in an in situ photocatalyzed oxidative PMP group deprotection strategy under
A Novel Method for the Synthesis of <i>N</i>-Sulfonylaldimines by ZnO as a Recyclable Neutral Catalyst Under Solvent-Free Conditions
作者:Mona Hosseini-Sarvari、Hashem Sharghi
DOI:10.1080/10426500701372355
日期:2007.7.19
ZnO acts as an effective catalyst for the rapid synthesis of a range of N-sulfonylaldimines from aromatic aldehydes and sulfonamides under solvent free conditions. The ZnO powder can be reused up to three times after simple washing with distilled water and ethyl acetate.