Diverse<i>N</i>-Heterocyclic Ring Systems via Aza-Heck Cyclizations of<i>N</i>-(Pentafluorobenzoyloxy)sulfonamides
作者:Ian R. Hazelden、Xiaofeng Ma、Thomas Langer、John F. Bower
DOI:10.1002/anie.201605152
日期:2016.9.5
bond of N‐(pentafluoro‐benzoyloxy)sulfonamides are described. These studies, which encompass only the second class of aza‐Heck reaction developed to date, provide direct access to diverse N‐heterocyclicringsystems.
Pyrrolidines and Piperidines by Ligand-Enabled Aza-Heck Cyclizations and Cascades of <i>N</i>
-(Pentafluorobenzoyloxy)carbamates
作者:Ian R. Hazelden、Rafaela C. Carmona、Thomas Langer、Paul G. Pringle、John F. Bower
DOI:10.1002/anie.201801109
日期:2018.4.23
Ligand‐enabled aza‐Heck cyclizations and cascades of N‐(pentafluorobenzoyloxy)carbamates are described. These studies encompass the first examples of efficient non‐biased 6‐exo aza‐Heck cyclizations. The methodology provides direct and flexible access to carbamate protected pyrrolidines and piperidines.
Radical [<i>n</i> + 1] Annulations with Sulfur Dioxide
作者:Anna Tsimelzon、Rebecca Braslau
DOI:10.1021/jo052035t
日期:2005.12.1
A new methodology for [n + 1] radical annulation using sulfurdioxide as a geminal radical acceptor/donor is presented. This methodology provides a novel route to the formation of five-, six-, and seven-membered cyclic sulfones utilizing a radical chain mechanism under very mild conditions.
提出了一种使用二氧化硫作为双基自由基受体/供体的[ n +1]自由基环化的新方法。这种方法学为在非常温和的条件下利用自由基链机理形成五元,六元和七元环状砜提供了一条新颖的途径。
Reactifs de grignard vinyliques γ fonctionnels
作者:J.G. Duboudin、B. Jousseaume、A Saux
DOI:10.1016/s0022-328x(00)91989-2
日期:1979.3
Primary α-acetylenic alcohols undergo regio- and stereo-specific additiions of Grignard reagents in the presence of cuprous halides. These reactions yield γ-functionally substituted vinylmagnesium compounds. With secondary and tertiary alcohols, the course of the reaction depends on the nature of alcohol and Grignard reagent.
Molybdenum-Catalyzed Hydroxyl-Directed <i>Anti</i>-Dihydroxylation of Allylic and Homoallylic Alcohols
作者:Pei Fan、Shixia Su、Chuan Wang
DOI:10.1021/acscatal.8b01449
日期:2018.8.3
A catalytic hydroxyl-directed anti-dihydroxylation of allylic and homoallylic alcohols has been developed. This operationally simple method was successfully applied to the direct anti-monodihydroxylation of allylic alcohols containing at least one distal olefinic unit. Under the catalysis of commercially available MoO2(acac)2, an array of hydroxylated dienes were successfully converted into various