Selective synthesis of 2‐(5‐oxo‐1‐arylhex‐1‐yn‐3‐yl)phenyl benzoates via FeCl
<sub>3</sub>
‐mediated cascade reactions of propargylamines with
<i>β</i>
‐enamino ketones
A mild and efficient FeCl3‐mediated cascade reaction of ortho‐hydroxyl propargylamines with β‐enamino ketones has been developed. This protocol provided a practical and selective method to synthesize 2‐(5‐oxo‐1‐arylhex‐1‐yn‐3‐yl)phenyl benzoates via in situ generated alkynyl o‐quinone methides following a cascade intermolecular 1,4‐conjugate addition/intramolecular nucleophilic addition/reverse Claisen
Acceleration of Petasis Reactions of Salicylaldehyde Derivatives with Molecular Sieves
作者:Xianglin Shi、Dominique Hebrault、Michael Humora、William F. Kiesman、Hairuo Peng、Tina Talreja、Zezhou Wang、Zhili Xin
DOI:10.1021/jo202117u
日期:2012.1.20
Mild reaction conditions for Petasis reactions of substituted salicylaldehydes with various amines and arylboronic acids in the presence of molecular sieves were developed. Molecular sieves (MS) significantly accelerated the reaction rates and drove the reactions to high conversions. The conditions were applied to the synthesis of the core structure of BIIB042, a gamma-secretase modulator, without stereochernical erosion of a stereogenic center in the salicylaldehyde intermediate.
Catalyst-Free Synthesis of 2,3-Dihydrobenzofurans via a Formal [4+1] Annulation of Propargylamines with Sulfur Ylides
A simple, general route to the 2,3-dihydrobenzofurans substituted at C3 by an aryethynyl or aryl group, starting from propargylamine and itsderivatives with benzoyl sulfonium salts, has been developed. This reaction involved an in situ generated o-quinone methide (o-QM) intermediate followed by [4+1] annulation with sulfur ylides. Notably, this protocol's features include moderate to excellent yields
Microwave-assisted nanocatalysis: A CuO NPs/rGO composite as an efficient and recyclable catalyst for the Petasis-borono–Mannich reaction
作者:Anshu Dandia、Sarika Bansal、Ruchi Sharma、Kuldeep S. Rathore、Vijay Parewa
DOI:10.1039/c8ra05203d
日期:——
CuO NPs/rGO composite was synthesized and characterized by various analytical techniques an used as a recyclable catalyst for Petasis-borono–Mannich reaction under microwave irradiation.