Synthesis, structure, and reductive rearrangement of a novel tricyclic isoxazolidine
作者:Tze-Ming Chan、R. Friary、B. Pramanik、M.S. Puar、V. Seidl、Andrew T. Mc Phail
DOI:10.1016/s0040-4020(01)82047-0
日期:1986.1
[2,3-d] isoxazole-4,4-dioxide (1) gave a nitrone (2) which underwent an intramolecular 1,3-dipolar cycloaddition yielding a tricyclic isoxazolidine (4). A single-crystal X-ray analysis unequivocally established the structure of 4 as 9β-phenyl-2-oxa-6-thia-1-azatricyclo[3.3.1.03,7]nonan-4α-o1-6,6-dioxide. LiA1H4 and LiA1D4, reduced 4 exhaustively and rearranged it profoundly to isotopomers 5 and 6, respectively
对2-甲基-3β-苯基-2,3α,3aβ,6aβ-四氢噻吩并[2,3-d]异恶唑-4,4-二氧化物(1)进行N氧化,得到的硝酮(2)经历了分子内的1, 3-偶极环加成产生三环异恶唑烷(4)。单晶X射线分析明确地确定了4的结构为9β-苯基-2-氧杂-6-硫杂-1-氮杂三环[3.3.1.0 3,7 ]壬南-4α-o1-6,6-二氧化物。LiA1H 4和LiA1D 4分别进行了彻底的还原4和深刻地重新排列为异构体5和6 ; 新颖的Grob片段可能介导了重排。除其他外,测量13C- 13 C的耦合常数和碎片离子的比率得出5和6的完整结构。它们是5β-苯基-8-硫杂-6-氮杂双环[3。3. 1]octan-2α-o1及其3α-氘代类似物。