The bicyclic compounds 2 and 4 are formed by intramolecular 1,3-dipolar cycloaddition of the nitrones 1 and 3, respectively. Reductive cleavage of 2a and 4a with desulfurization yields α,γ-aminoalcohols 7 and 9, respectively, as diastereomerically pure compounds.
双环化合物2和4分别通过硝酮1和3的分子内1,3-偶极环加成形成。2a和4a脱
硫还原还原分别生成α,γ-
氨基醇7和9,为非对映体纯化合物。