A biocatalytic/reductive etherification approach to substituted piperidinyl ethers
作者:Jeffrey T. Kuethe、Jacob M. Janey、Matthew Truppo、Juan Arredondo、Tao Li、Kelvin Yong、Shuwen He
DOI:10.1016/j.tet.2014.04.064
日期:2014.7
synthetically useful protocol has been developed for the preparation of highly functionalized piperidinyl ethers. Biocatalytic reduction of cyclhexanones 7, 10, and 14 allows for the preparation of both cis- and trans diastereomers with an extremely high degree of stereochemical control. Reductive etherification of the corresponding trimethylsilylethers with 1-(benzyloxycarbonyl)-4-piperidinone 17 in the presence
Intramolecular Schmidt Reaction Involving Primary Azidoalcohols under Nonacidic Conditions: Synthesis of Indolizidine (−)-167B
作者:Ajoy Kapat、Erich Nyfeler、Guy T. Giuffredi、Philippe Renaud
DOI:10.1021/ja908933s
日期:2009.12.16
reported. This approach involves a nonacidic activation of the alcohol via triflation. The synthetic potential offered by the mild reaction conditions is demonstrated by a highly selective synthesis of (-)-indolizidine167B.
Synthesis and Characterization of 2-Carboxyethyltriphenyl Phosphonium Tribromide and Its Application as Catalyst in Silylation of Alcohols and Thiols Under Solvent-Free Condition
作者:Rupa Rani Dey、Siddhartha Sankar Dhar
DOI:10.1080/00397911.2014.897356
日期:2014.8.18
Preparation, characterization and use of 3-methyl-1-sulfonic acid imidazolium hydrogen sulfate as an eco-benign, efficient and reusable ionic liquid catalyst for the chemoselective trimethylsilyl protection of hydroxyl groups
作者:Nader Ghaffari Khaligh
DOI:10.1016/j.molcata.2011.08.021
日期:2011.10
New and novel ionic liquid (3-methyl-1-sulfonic acid imidazolium hydrogen sulfate) is a recyclable and eco-benign catalyst for the chemoselective trimethylsilyl protection of hydroxyl groups under solvent-free conditions to afford trimethylsilanes in excellent yields (92-100%) and in very short reaction times (1-8 min). The catalyst was characterized by FT-IR, H-1 NMR and C-13 NMR studies. All the products were extensively characterized by H-1 NMR, IR, GC-MS and melting point analyses. A mechanism for the catalytic activity is proposed. The catalyst can be recovered and reused without loss of activity. The work-up of the reaction consists of a simple separation, followed by concentration of the crude product and purification. (C) 2011 Elsevier B.V. All rights reserved.
Succinimide-<i>N</i>-Sulfonic Acid: A Mild, Efficient, and Reusable Catalyst for the Chemoselective Trimethylsilylation of Alcohols and Phenols