PROCESS FOR THE PREPARATION OF (E)-3-(1-PROPENYL)ISOXAZOLINE
申请人:NIPPON SODA CO., LTD.
公开号:EP1174429A1
公开(公告)日:2002-01-23
A process for the preparation of (E)-3-(1-propenyl)-2-isoxazoline, characterized by reacting crotonaldehyde with hydroxylamine to form an oxime, and then converting the oxime into a nitrile oxide while reacting the nitrile oxide with ethylene.
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).
WADE, PETER A.;RAO, J. APPA;BEREZNAK, JAMES F.;YUAN, C. -K., TETRAHEDRON LETT., 30,(1989) N4, C. 5969-5972
作者:WADE, PETER A.、RAO, J. APPA、BEREZNAK, JAMES F.、YUAN, C. -K.
DOI:——
日期:——
A dihydroisoxazole-based route to 2,3,6-trideoxy-3-aminohexose derivatives
作者:Peter A. Wade、J.Appa Rao、James F. Bereznak、C.-K. Yuan