A convenient procedure for the preparation of α-aminoallenes using a three-component reaction of aldehyde, carbamate and propargylsilane
摘要:
A three-component reaction is described using an aldehyde, a carbamate and trimethylpropargylsilane in the presence of a Lewis acid for the production in moderate to good yield of alpha-allenyl amines. The reaction is applicable to aromatic or aliphatic aldehydes, The obtained alpha-aminoallenes are transformed into Delta(3)-pyrrolidines or amino acids by Using the reactivity of the cumulene function. (C) 2002 Elsevier Science Ltd. All rights reserved.
A convenient procedure for the preparation of α-aminoallenes using a three-component reaction of aldehyde, carbamate and propargylsilane
摘要:
A three-component reaction is described using an aldehyde, a carbamate and trimethylpropargylsilane in the presence of a Lewis acid for the production in moderate to good yield of alpha-allenyl amines. The reaction is applicable to aromatic or aliphatic aldehydes, The obtained alpha-aminoallenes are transformed into Delta(3)-pyrrolidines or amino acids by Using the reactivity of the cumulene function. (C) 2002 Elsevier Science Ltd. All rights reserved.
A new iron-catalyzed chemoselective intramolecular hydroamination and hydroalkoxylation of the readily available α-allenic amines and alcohols to valuable unsaturated 5-membered heterocycles, 2,3-dihydropyrrole and 2,3-dihydrofuran, is reported. Effective selectivity control is achieved by a metal–ligand cooperative activation of the substrates. The mild reaction conditions and the use of low amounts