A palladium-catalyzed arylation of N-acyl-N,O-acetals with arylboronic reagents: synthesis of diarylmethylamines protected by easily removable acyl group
摘要:
An efficient process was developed to synthesis diarylmethylamines protected by a readily removable acyl group using a palladium-catalyzed arylation of N-acyl-N,O-acetals with arylboronic reagents. The attractive features of this protocol are: the ease of preparing substrate and the mild reaction condition under an air atmosphere. Moderate enantioselectivity was observed in preliminary screening studies of chiral ligands. (C) 2015 Elsevier Ltd. All rights reserved.
N-[1-(Benzotriazol-1-yl)alkyl]amides, versatile amidoalkylation reagents. 5. A general and convenient route to N-(.alpha.-alkoxyalkyl)amides
摘要:
N-[1-(Benzotriazol-1-yl)alkyl]amides 2, easily prepared from benzotriazole 1, an aldehyde, and an amide, react readily with a variety of primary and secondary alcohols under mild conditions to give N-(alpha-alkoxyalkyl)amides 3 in good yield.
functional group can act as a synthetic precursor to unstable reactive N-acylimines. In this paper, a variety of N-acyl-O-ethyl-N,O-acetals was concisely prepared under mild conditions mediated by titanium ethoxide (Ti(OEt)4). The method also offers a new strategy to make other O-alkyl-N,O-acetals. Furthermore, this strategy was extended to the synthesis of an analogue of the natural product turtschamide