Metal-Catalyzed Syntheses of Abridged CDE Rings of Rubriflordilactones A and B
摘要:
The development of complementary palladium- and cobalt-catalyzed approaches to tricyclic arylsilanes suitable for elaboration into the CDE ring systems of rubriflordilactones A and B is reported. Microwave conditions are required to effect a cobalt-catalyzed triyne cyclotrimerization, which critically depends on the substitution pattern of the triyne termini. Mild conditions to elaborate these arylsilanes to the CDE cores of the natural products are described.
Metal-Catalyzed Syntheses of Abridged CDE Rings of Rubriflordilactones A and B
摘要:
The development of complementary palladium- and cobalt-catalyzed approaches to tricyclic arylsilanes suitable for elaboration into the CDE ring systems of rubriflordilactones A and B is reported. Microwave conditions are required to effect a cobalt-catalyzed triyne cyclotrimerization, which critically depends on the substitution pattern of the triyne termini. Mild conditions to elaborate these arylsilanes to the CDE cores of the natural products are described.
Total Synthesis of the <i>Schisandraceae</i>
Nortriterpenoid Rubriflordilactone A
作者:Guilhem Chaubet、Shermin S. Goh、Mujahid Mohammad、Birgit Gockel、Marie-Caroline A. Cordonnier、Hannah Baars、Andrew W. Phillips、Edward A. Anderson
DOI:10.1002/chem.201703229
日期:2017.10.9
Full details of the totalsynthesis of the Schisandraceae nortriterpenoid natural product rubriflordilactone A are reported. Palladium- and cobalt-catalyzed polycyclizations were employed as key strategies to construct the central pentasubstituted arene from bromoendiyne and triyne precursors. This required the independent assembly of two AB ring aldehydes for combination with a common diyne component
报道了五味子科降三萜类天然产物 rubriflordilactone A 的全合成细节。钯和钴催化的多环化被用作从溴戊二炔和三炔前体构建中心五取代芳烃的关键策略。这需要独立组装两个AB环醛以与共同的二炔组分结合。人们探索了许多模型系统来研究这两种方法,并建立了具有挑战性的苯并吡喃和丁烯内酯环的安装路线。
Hypervalent iodine-mediated gem-difluorination of vinyl halides enabled by exclusive 1,2-halo migration
作者:Chenglong Li、Yangzhen Liao、Xuemei Tan、Xiaozu Liu、Peijun Liu、Wen-Xin Lv、Honggen Wang
DOI:10.1007/s11426-021-9965-9
日期:2021.6
β-Difluorinated alkyl halides are of significant value in the modular synthesis of gem-difluorinated molecules. An exclusive 1,2-halo migratory gem-difluorination of vinyl halides with in situ-generated PhIF2·HF is described. This protocol provides a general and practical approach towards a wide variety of β-difluorinated alkyl bromides. Both α- and β-bromoalkyl alkenes are suitable substrates, leading
Metal-Catalyzed Syntheses of Abridged CDE Rings of Rubriflordilactones A and B
作者:Shermin S. Goh、Hannah Baars、Birgit Gockel、Edward A. Anderson
DOI:10.1021/ol303041j
日期:2012.12.21
The development of complementary palladium- and cobalt-catalyzed approaches to tricyclic arylsilanes suitable for elaboration into the CDE ring systems of rubriflordilactones A and B is reported. Microwave conditions are required to effect a cobalt-catalyzed triyne cyclotrimerization, which critically depends on the substitution pattern of the triyne termini. Mild conditions to elaborate these arylsilanes to the CDE cores of the natural products are described.