synthesized in good yields and high enantiomeric excesses (ee = 87– 96%) from the corresponding simple cyclic and acyclic ketone precursors. The procedure involves a regioand diastereoselective electrophilic fluorination of enantiopure -silylketones 2 (de = 37– 98%) using commercially available N-fluorobenzosulfonimide as fluorinating agent, followed by a racemization–free cleavage of the silyl directing
Synthesis 2001, No. 15, 12 11 2001。文章标识符:1437-210X,E;2001,0,15,2307,2319,ftx,en;Z10001SS.pdf。© Georg Thieme Verlag Stuttgart · 纽约 ISSN 0039-7881 摘要: -
氟代
酮 6 由相应的简单环状和非环状
酮前体以高产率和高对映体过量(ee = 87–96%)合成。该过程包括使用市售的 N-
氟苯磺
酰亚胺作为
氟化剂对对映体纯-甲
硅烷基
酮 2 (de = 37–98%) 进行区域和非对映选择性亲电
氟化,然后以几乎定量的产率对甲
硅烷基导向基团进行无消旋化裂解。