Reversal of the facial diastereoselectivity in the Paternò-Büchi reaction of silyl enol ethers carrying a chiral substituent in α-position
作者:Thorsten Bach、Kai Jödicke、Birgit Wibbeling
DOI:10.1016/0040-4020(96)00610-2
日期:1996.8
diastereoselectivity in the Paternò-Büchi reaction of benzaldehyde and silyl enol ethers 1 which bear a chiral substituent R∗ in α-position has been studied. Since the regioselectivity and the simple diastereoselectivity of the photocycloaddition is very good only two diastereoisomers are obtained whose ratio reflects the facial diastereoselectivity. With the silyloxy substituted substrates 1a-1c the selectivity