Regio- and diastereo-selectivity in 1,3-dipolar cycloadditions of nitrile oxides to 4-substituted cyclopent-2-enones
作者:Giorgio Adembri、Gianluca Giorgi、Raffaella L. Lampariello、Maria L. Paoli、Alessandro Sega
DOI:10.1039/b003549l
日期:——
4-hydroxy-4-methylcyclopent-2-enone and related 4-substituted cyclopent-2-enones towards 1,3-dipolar cycloaddition with nitrile oxides is studied. The reactions are always completely regioselective while the diastereofacialselectivity depends on the nature of the substituents. Remarkably, the reaction of 4-acetoxycyclopent-2-enone shows complete regio- and diastereo-facial selectivity.
1,6-Bis(2-oxooxazolidin-3-ylcarbonylamino)hexane (1) was prepared from 2-oxazolidinone and hexamethylenediisocyanurate using triethylenediamine as a catalyst in benzene. A TG effluent gas is collected in a cold trap and then directly injected into a GC for separation, the MS for unequivocal identification. The 13 effluent compounds from the thermal degradation of 1 were identified.