Metal free chemoselective reduction of α-keto amides using TBAF as catalyst
作者:N. Chary Mamillapalli、Govindasamy Sekar
DOI:10.1039/c4ra13090a
日期:——
metal and ligand free chemoselective reduction of the keto group and complete reduction of the both keto and amide groups of α-keto amide with hydrosilanes using tetrabutylammoniumflouride (TBAF) as catalyst have been accomplished. This methodology affords an efficient and economic route for the synthesis of biologically important α-hydroxyamides and β-amino alcohols. The other important advantage of
Anionic activation by fluoride ion in solid-liquid systems
作者:S. Sebti、A. Foucaud
DOI:10.1016/s0040-4020(01)87355-5
日期:1986.1
and 2-acyloxy 3-oxo 2,3-diphenylpropanamides 13 under anionic activation by cesium fluoride was studied. The fluoride ion is an efficient base for the heterocyclization of 1 into 3 (2H)-furanones and 2 (5H)-furanones, but the hydrolysis of the ester group lowered the selectivity of the reaction. However, the cleavage of 13 into the esters 14 and the cyclization of 3-benzoyloxy 3-methyl 2-butanone into
The First Catalytic, Asymmetric α-Additions of Isocyanides. Lewis-Base-Catalyzed, Enantioselective Passerini-Type Reactions
作者:Scott E. Denmark、Yu Fan
DOI:10.1021/ja035410c
日期:2003.7.1
The first, catalytic, enantioselective alpha-additions of isocyanides to aldehydes have been demonstrated (Passerini-typereactions). The catalytic system of silicon tetrachloride and a chiral bisphosphoramide 5a provided high yields and good to excellent enantioselectivities for the addition of tert-butyl isocyanide to a wide range of aldehydes (aromatic, olefinic, acetylenic, aliphatic). Aqueous
Catalytic, Enantioselective α-Additions of Isocyanides: Lewis Base Catalyzed Passerini-Type Reactions
作者:Scott E. Denmark、Yu Fan
DOI:10.1021/jo050549m
日期:2005.11.1
(Passerini-type reactions). The catalytic system of silicontetrachloride and a chiral bisphosphoramide (R,R)-1b provided high yields and good to excellent enantioselectivities for the addition of tert-butyl isocyanide to a wide range of aldehydes (aromatic, heteroaromatic, olefinic, acetylenic, aliphatic). Aqueous workup afforded the α-hydroxy tert-butyl amides whereas a low-temperature methanol quench followed
The use of 2-hydroxymethyl benzoic acid as an effective water surrogate in the Passerini reaction: A straightforward access to α-hydroxyamides
作者:Marta Serafini、Alessia Griglio、Elena Oberto、Tracey Pirali、Gian Cesare Tron
DOI:10.1016/j.tetlet.2017.11.021
日期:2017.12
over the years, but they share common drawbacks in terms of generality and tolerability, especially to acid labile functionalities. Here we report a truncated Passerini reaction suitable for the easy and mild preparation of functionalized α-hydroxyamides. In particular, this procedure is tolerant to acid sensitive protecting groups, which remain intact during the multicomponent reaction.