On treatment of triazoles having an N‐sulfonyl‐protected benzylamine moiety with [Rh2(C7H15CO2)4], intramolecular C−H bond insertion takes place at the benzylic position to give cis‐N‐sulfonyl‐2‐aryl‐3‐[(sulfonylimino)methyl]pyrrolidines in good yields and with highly stereoselectivities. Analogously, the similar treatment of triazoles having an ether or even an alkyl moiety affords 2‐alkyl‐ or 2‐
治疗上具有三唑Ñ用的[Rh磺酰基保护的苄胺部分2(C 7 ħ 15 CO 2)4 ],分子内C-H键的插入发生在苄基位置,得到顺式- ñ -磺酰基-2-芳基-3-[(磺酰亚胺基)甲基]吡咯烷酮收率高且立体选择性高。类似地,对具有醚或什至烷基部分的三唑进行类似处理,得到2-烷基-或2-芳基-3-[[磺酰亚胺聚合物)甲基]四氢呋喃或2-烷基-3-[[磺酰亚胺聚合物]甲基]环戊烷。良品率高。
Secondary stereocontrolling interactions in chiral Brønsted acid catalysis: study of a Petasis–Ferrier-type rearrangement catalyzed by chiral phosphoric acids
作者:Kyohei Kanomata、Yasunori Toda、Yukihiro Shibata、Masahiro Yamanaka、Seiji Tsuzuki、Ilya D. Gridnev、Masahiro Terada
DOI:10.1039/c4sc00611a
日期:——
Chiral phosphoric acids have emerged as promising asymmetric Brønsted acid catalysts that harness hydrogen bonding interactions as key stereocontrolling elements. A new approach to chiral phosphoric acid catalysis through ion-pairing interactions between the anionic conjugate base of the catalyst and a cationic electrophile has recently attracted attention. However, the mechanism of stereocontrol through