Regio- and stereo-selective formation of 2-siloxy-2-alkoxyoxetanes in the photoreaction of cyclic ketene silyl acetals with 2-naphthaldehyde and their transformation to aldol-type adducts
Regio- and stereo-selective formation of bicyclo 2-siloxy-2-alkoxyoxetanes 7, 13, 14 was achieved by the proper choice of the solvent and the silyl group in the photoreaction of the cyclic ketene silyl acetals 6, 11, 12 with 2-naphthaldehyde 2, and their transformation to the aldol-type adducts 9, 15, 16 was easily accomplished under the neutral conditions.
A stereoselective, tandem [2+2] photocycloaddition–hydrolysis route to aldol-type adducts
作者:Manabu Abe、Masayuki Ikeda、Masatomo Nojima
DOI:10.1039/a805404e
日期:——
Photocycloadditions of aromatic aldehydes 2aâe with cyclic ketene silyl acetals 1aâe have been investigated. Regio- and exo-selective formation of the bicyclic 2-alkoxyoxetanes 3 was observed in high yields. Hydrolysis of the acid-labile oxetanes 3 with neutral water was efficiently achieved to give aldol-type adducts 4 (threo-selective formations).