Synthesis of bicyclic nitrogen compounds via tandem intramolecular Heck cyclization and subsequent trapping of intermediate .pi.-allylpalladium complexes
摘要:
Intramolecular palladium-mediated three-component cyclizations of substrates containing vinyl halide, olefin, and sulfonamide moieties to generate a diverse group of nitrogen heterocycles have been developed. The methodology has been applied to construction of both fused and bridged bicyclic systems. The strategy can also be used for spirocyclizations. This chemistry involves regiospecific generation of pi-allylpalladium complexes via Heck reactions of vinyl halides and simple olefins, followed by nucleophilic addition of sulfonamide anions to these intermediates.
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。
Copper-Catalyzed Double Additions and Radical Cyclization Cascades in the Re-Engineering of the Antibacterial Pleuromutilin
作者:Rebecca E. Ruscoe、Neal J. Fazakerley、Huanming Huang、Sabine Flitsch、David J. Procter
DOI:10.1002/chem.201504343
日期:2016.1.4
novel tricyclic architectures inspired by pleuromutilin. SmII‐mediated radical cyclizationcascades of dialdehydes, prepared using a new, one‐pot, copper‐catalyzed double organomagnesium addition to β‐chlorocyclohexenone, proceed with complete sequence selectivity and typically with high diastereocontrol to give analogues of the target core. Our expedient approach (ca. 7 steps) allows non‐traditional,
涉及简单制备的起始材料的通用合成序列提供了受截短侧耳素启发的多种新颖的三环结构的快速获得。 Sm II介导的二醛自由基环化级联是使用一种新的、一锅法、铜催化的双有机镁加成到 β-氯环己烯酮制备的,具有完全的序列选择性和通常具有高非对映控制,以产生目标核心的类似物。我们的权宜方法(大约 7 个步骤)允许通过非传统的从头合成方式获得无法通过半合成从天然产物中制备的重要抗菌剂的类似物。
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
MACROCYCLIZATION REACTIONS AND INTERMEDIATES USEFUL IN THE SYNTHESIS OF ANALOGS OF HALICHONDRIN B
申请人:FANG Francis G.
公开号:US20160264594A1
公开(公告)日:2016-09-15
The invention provides methods for the synthesis of eribulin or a pharmaceutically acceptable salt thereof (e.g., eribulin mesylate) through a macrocyclization strategy. The macrocyclization strategy of the present invention involves subjecting a non-macrocyclic intermediate to a carbon-carbon bond-forming reaction (e.g., an olefination reaction (e.g., Homer-Wadsworth-Emmons olefination), Dieckmann reaction, catalytic Ring-Closing Olefin Metathesis, or Nozaki-Hiyama-Kishi reaction) to afford a macrocyclic intermediate. The invention also provides compounds useful as intermediates in the synthesis of eribulin or a pharmaceutically acceptable salt thereof and methods for preparing the same.
Synthesis of halichondrin analogs and uses thereof
申请人:President and Fellows of Harvard College
公开号:US11155562B2
公开(公告)日:2021-10-26
The present invention provides halichondrin analogs, such as compounds of Formula (I). The compounds may bind to microtubule sites, thereby inhibiting microtubule dynamics. Also provided are methods of synthesis, pharmaceutical compositions, kits, methods of treatment, and uses that involve the compounds for treatment of a proliferative disease (e.g., cancer). Compounds of the present invention are particularly useful for the treatment of metastatic breast cancer, non-small cell lung cancer, prostate cancer, and sarcoma. The included methods of synthesis are useful for the preparation of compounds of Formula (I)-(III) along with naturally occurring halicondrins (e.g., halichondrin B & C, norhalichondrin A, B, & C, and homohalichondrin A, B, & C). Also included are methods for interconverting between the halichondrins, norhalichondrins, and homohalichondrins and their unnatural epimers at the C38 ketal stereocenter through the use of an acid-mediated equilibration.