Published as part of the Special Topic Modern Cyclization Strategies in Synthesis Abstract An iridium/dppf complex efficiently catalyzed the oxidativecyclization of N-sulfonyl alkenyl amides and alkenoic acids. Electron-deficient alkenes were effective as sacrificial hydrogen acceptors. High selectivity of the oxidativecyclization over the competing addition reaction has been realized by the use
Iridium/chiral diene complexes efficiently catalyzed the asymmetric cyclization of N-sulfonyl alkenyl amides to give the corresponding 2-pyrrolidone derivatives with high enantioselectivity. A mechanistic study revealed that the reaction proceeds via nucleophilic attack of the amide on the alkene moiety.
Substituted-amine compound and a process for the preparation thereof
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US05256824A1
公开(公告)日:1993-10-26
The compound (-)-N-t-butyl-4,4-diphenyl-2-cyclopentenylamine, or its hydrochloride salt has anticholinergic activity, and thus has a variety of pharmaceutical utilities.
Asymmetric Synthesis of α-Spiro-γ-lactones and α-Substituted γ-Lactones via Chiral Bifunctional Sulfide-Catalyzed Bromolactonizations
作者:Taiki Mori、Koki Abe、Seiji Shirakawa
DOI:10.1021/acs.joc.2c02283
日期:——
via BINOL-derived chiral bifunctional sulfide-catalyzed bromolactonizations of α-allyl carboxylic acids containing either hetero- or carbocyclic structures. Transformations of the resultant α-spiro-type bromolactonization product were examined to obtain optically active γ-functionalized α-spiro-γ-lactones. The utility of this catalytic system was also demonstrated in the asymmetric synthesis of α,α-diaryl-