Preparative flash vacuum thermolysis. Homolytic cleavage of isomannide and isosorbide dinitrate to 1,4,3,6-dianhydrohexoses
作者:Jan G. Batelaan、Anton J. M. Weber、Ulfert E. Wiersum
DOI:10.1039/c39870001397
日期:——
1,4,3,6-dianhydromannopyranose (3) can be conveniently prepared by flash vacuum thermolysis of isomannide dinitrate (1), while its epimer isosorbide dinitrate (2) yields a mixture of (3) and 1,4,3,6-dianhydrofructose (5), reflecting the restricted number of rearrangements, in one case with inversion of configuration, possible in the intermediate cis-fused furofuran radicals.
1,4,3,6-dianhydromannopyranose(3)可以通过快速真空热解硝酸异甘露酯(1)来制备,而其差向异构体异山梨醇二硝酸酯(2)则可以得到(3)和1,4,3,6的混合物。-双脱水果糖(5),反映了在顺式-融合的呋喃呋喃自由基中间基团中可能发生的重排数量受限,在一种情况下具有构型反转的情况。