Synthesis of <scp>l</scp>-Daunosamine Derivatives on the Basis of the Asymmetric Dihydroxylation of 3-((<i>E</i>)-1-Propenyl)-4,5-dihydroisoxazole
作者:Peter A. Wade、Stephen G. D'Ambrosio、Jetla Appa Rao、Sharmila Shah-Patel、Damien T. Cole、James K. Murray,、Patrick J. Carroll
DOI:10.1021/jo962293d
日期:1997.5.1
Methyl L-N,O-diacetyldaunosaminide was prepared from 3-nitro-4,5-dihydroisoxazole in 8.5% overall yield. A key step in the synthesis involved the AD reaction of (E)-3-(1-propenyl)-4,5-dihydroisoxazole (2b), affording the corresponding diol in 76% yield (92% ee). A second key step involved reductive cleavage of the dihydroisoxazole 4a and subsequent N-acetylation to afford separable diastereomeric gamma-(acetylamino)alcohols 7a and 8a in 62% yield (72:28, 7a/8a). Swern oxidation of 7a and subsequent methanolysis followed by acetylation provided methyl L-N,O-diacetyldaunosaminide as an anomeric mixture. The AD reactions of chiral alkenyl dihydroisoxazole 16 with (DHQ)(2)-PHAL and (DHQD)(2)-PHAL afforded diastereomeric diol products, isolated as the acetates 18 and 19 (98:2 and 5:95 ratios, respectively, depending on the chiral auxiliary).