An efficient and short totalsynthesis of the fungal benzo[j]fluoranthene compound bulgarein is reported. Key steps in the totalsynthesis are a Suzuki-Miyaura coupling reaction of two substituted naphthalene derivates followed by a polyphosphoric acid (PPA) mediated condensation reaction to form the benzo[j]fluoranthene skeleton.
Atroposelective Ni<sup>II</sup>‐Catalyzed Cross‐Coupling Reactions Enable a Deeper Understanding of Negishi Couplings: Isolation and Application of Solid Aryl Higher‐Order Zincates
作者:Damian Groß、Willem A. L. van Otterlo、Oliver Trapp、Dino Berthold
DOI:10.1002/chem.202302841
日期:2023.12
NiII-catalyzed atroposelective Negishicross-couplingreaction revealed the importance of higher-order zincates as the transmetallating active species. An easy synthesis procedure for such zincates was developed and applied to a variety of potentially useful solid monoaryl higher-order zincates. Finally, the advantages of these reagents in differentcross-couplingreactions were exemplified.
Ni II催化的原子选择性 Negishi 交叉偶联反应优化过程中的初步实验结果揭示了高阶锌酸盐作为金属转移活性物质的重要性。开发了此类锌酸盐的简单合成方法,并将其应用于各种潜在有用的固体单芳基高阶锌酸盐。最后,举例说明了这些试剂在不同交叉偶联反应中的优势。
Unprecedented Direct Asymmetric Total Syntheses of 5,8’‐Naphthylisoquinoline Alkaloids from their Fully Substituted Precursors Employing a Novel Nickel/N,N‐ligand‐Catalyzed Atroposelective Cross‐Coupling Reaction
作者:Dino Berthold、Willem A. L. van Otterlo
DOI:10.1002/chem.202302070
日期:2023.11.2
Four different 5,8’-coupled naphthylisoquinoline alkaloids have been prepared via a general and concise synthetic pathway directly from the corresponding cross-coupling reaction precursors. For the cross-coupling key step, a new Negishi cross-coupling reaction, employing a Ni/N,N-ligand-based catalyst providing the natural products in good yields and high enantiomeric purities, has been developed.