Solvent-free synthesis of monoacylaminals from the reaction of amides and aminals as precursors in carbinolamide synthesis
摘要:
A solvent-free method of generating monoacylaminals by heating the amide and aminal starting materials in the presence of one another has been developed. Yields were generally between 45% and 65% with the monoacylaminal being isolated, needing no further purification after drying under high vacuum. (C) 2010 Elsevier Ltd. All rights reserved.
α-Acetylstyrylphosphonates were conveniently synthesized from 2-oxopropylphosphonates and substituted (dimorpholinomethyl)-benzenes (aminals). 4-Benzylidenemorpholinium carboxylates, generated from aminals by the action of α-halo acids, reacted with the phosphonates to give the products by elimination of the amine. The yields were influenced by the nature of substituents and their position in the phenyl ring and could be improved by adjustment of the acidities of the reacted acids. α-Acetylstyrylphosphonates containing various substituents on every position (at the 2-, 3-, or 4-position) in the phenyl ring were obtained generally in excellent yields using monochloroacetic acid.
Synthesis of 3-(aminomethyl)pyridine by traceless C3-selective umpolung of 1-amidopyridin-1-ium salts
作者:Pingsheng Tang、Dehai Xiao、Bo Wang
DOI:10.1039/c6cc09582h
日期:——
A natural product inspired rapid access of 3-(aminomethyl)pyridine by one-pot reaction of 1-amidopyridin-1-ium salt with aminal followed by reductive cleavage of the N-N bond is developed. This C3-selective formal C-H...
Rediscovering aminal chemistry: copper(<scp>ii</scp>) catalysed formation under mild conditions
作者:Juliana G. Pereira、João P. M. António、Ricardo Mendonça、Rafael F. A. Gomes、Carlos A. M. Afonso
DOI:10.1039/d0gc01977a
日期:——
aldehyde lithiation. Nevertheless, the existing methodologies for their formation typically employ harsh conditions limiting their usefulness. In this work, we present an efficient and mild methodology for the preparation of aminals from aromatic aldehydes, including furanic platforms. These mildconditions allowed ease of access to a plethora of aminals and as such we set out to explore previously unaccessible
Solvent-free synthesis of monoacylaminals from the reaction of amides and aminals as precursors in carbinolamide synthesis
作者:Matthew F. Sansone、Takaoki Koyanagi、David E. Przybyla、Richard W. Nagorski
DOI:10.1016/j.tetlet.2010.09.043
日期:2010.11
A solvent-free method of generating monoacylaminals by heating the amide and aminal starting materials in the presence of one another has been developed. Yields were generally between 45% and 65% with the monoacylaminal being isolated, needing no further purification after drying under high vacuum. (C) 2010 Elsevier Ltd. All rights reserved.