Crystal structure of (3aR,6aR)-3-[(2R,3R,4S,5R)-4-benzyloxy-2,3-O-isopropylidenedioxy- tetrahydrofuran-5-yl)]-3a,6a-dihydrofuro[2,3-d]isoxazole, C19H21NO6

S. Henkel, T. Leibold, V. Jäger
1997 Zeitschrift für Kristallographie - New Crystal Structures  
Source of material: The title compound (see réf. 1) was prepared by 1,3-dipolar cycloaddition of furan (see ref. 2 and 3) with the nitrile oxide precursor 3-O-benzyl-1,2-O-isopropylidene-D-xylofururono-hydroximoyl chloride (see ref. 4). The mixture of diastereomeric cycloadducts [70:30] was separated by MPLC and the major (xylo) isomer was recrystallized from petroleum ether/ethyl acetate. In the crystal, two conformers with respect to the arrangement of the phenyl group are present in a
more » ... ical 1:1 ratio, oriented almost perfectly perpendicular (89.95°).
doi:10.1524/ncrs.1997.212.jg.431 fatcat:qfwzd5izkrco7a4tseiu72nqr4