Abstract
The one-pot reaction of alkylisocyanides 1 and acetylenic esters 2 in the presence of 1, 3-diketones 3 provides an efficient access to 2-amino-4 H-pyrans 4a–l. Ketenimines 5 were detected in the early stage of reaction as intermediates. The products 4a–l are stabilised by an intra molecular N-H…O hydrogen bonding.
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