A Pd(II)-Catalyzed Ring-Expansion Reaction of Cyclic 2-Azidoalcohol Derivatives: Synthesis of Azaheterocycles
作者:Shunsuke Chiba、Yan-Jun Xu、Yi-Feng Wang
DOI:10.1021/ja9049564
日期:2009.9.16
A Pd(II)-catalyzed ring expansion-reaction of cyclic 2-azidoalcohol derivatives was found to proceed via an unprecedented C-C bond cleavage-C-N bond formation sequence, providing substituted azaheterocycles.
发现 Pd(II) 催化的环状 2-叠氮醇衍生物的扩环反应通过前所未有的 CC 键断裂-CN 键形成序列进行,提供取代的氮杂杂环。
A Three-Component Coupling Approach to Cyclopentanoids
作者:Barry M. Trost、Anthony B. Pinkerton
DOI:10.1021/jo010593b
日期:2001.11.1
A new approach to 2,3-disubstituted cyclopentenones has been developed. This approach consists of a two-step protocol involving the cyclization of a Z-vinyl bromide under Barbier type conditions to form a cyclopentenol, which is then oxidatively rearranged to generate the cyclopentenone. The Z-vinyl bromide is in turn derived from a ruthenium catalyzed three-component coupling of an alkyne, an enone
Rh-catalyzed reagent-free ring expansion of cyclobutenones and benzocyclobutenones
作者:Peng-hao Chen、Joshua Sieber、Chris H. Senanayake、Guangbin Dong
DOI:10.1039/c5sc01875g
日期:——
A reagent-free Rh-catalyzed ring-expansion reaction via C–C cleavage of cyclobutenones and benzocyclobutenones is reported.
报道了一种无试剂的Rh催化的环扩张反应,通过对环丁酮和苯并环丁酮进行C-C键裂解。
Regio- and Chemoselective Bromination of 2,3-Diarylcyclopent-2-en-1-ones
作者:Valerii Z. Shirinian、Dmitry V. Lonshakov、Vadim V. Kachala、Igor V. Zavarzin、Alexey A. Shimkin、Andrew G. Lvov、Mikhail M. Krayushkin
DOI:10.1021/jo301474j
日期:2012.9.21
The bromination of 2,3-diarylcyclopent-2-en-1-ones under various conditions has been studied. It was found that depending on the brominating reagent and nature of solvent the bromine atom can be introduced at the 4- or 5-position of the ethene “bridge”, as well as into the aryl moieties. Aryl group bromination is accomplished with such reagents as molecular bromine, N-bromosuccinimide, or tetrabutylammonium
Enhanced geometrical control in a Ru-catalyzed three component coupling
作者:Barry M Trost、Anthony B Pinkerton
DOI:10.1016/s0040-4039(00)01735-4
日期:2000.12
Exclusive Z-selectivity in the Ru-catalyzed bromoalkylation of alkynes with vinyl ketones is observed with aryl and other tertiary substituted acetylenic substrates, a feature that has led to an efficient synthesis of a COX-2 inhibitor.