Directed ortho Metalation (DoM)-Linked Corriu–Kumada, Negishi, and Suzuki–Miyaura Cross-Coupling Protocols: A Comparative Study
作者:Victor Snieckus、Claude Quesnelle
DOI:10.1055/s-0037-1611053
日期:2018.11
the DoM strategy lends itself to the regioselective construction of diversely substitutedaromatics and heteroaromatics. A systematic study of the widely used, titled name reaction transition-metal-catalyzed cross-coupling reactions with attention to context with the directed ortho metalation (DoM) is reported. In general, the Suzuki–Miyaura and Negishi protocols show greater scope and better yields
致力于斯科特丹麦:至此,我们(以及缺席的KB )正在庆祝您的创造力和成就。 发布时间作为的一部分奉献给斯科特E.丹麦在他65之际特别节日的生日。 抽象的 报告了对广泛使用的标题反应过渡金属催化的交叉偶联反应的系统研究,并着眼于定向原金属化(D o M)。通常,Suzuki-Miyaura和Negishi方案比Corriu-Kumada方案具有更大的范围和更高的产量,尽管后者定性地以最快的速度进行,但功能基团的耐受性较低。据证明,Negishi工艺可用于具有亲核试剂和碱敏感功能的底物,其效率可与Suzuki-Miyaura反应媲美。这些交叉偶联反应与D o M策略的联系使其适用于不同取代的芳族化合物和杂芳族化合物的区域选择性结构。 报告了对广泛使用的标题反应过渡金属催化的交叉偶联反应的系统研究,并着眼于定向原金属化(D o M)。通常,Suzuki-Miyaura和Negishi方案比Cor
Ni-Catalyzed Cross-Electrophile Coupling of Aryl Triflates with Thiocarbonates via C–O/C–O Bond Cleavage
作者:Zhaodong Zhu、Yuxin Gong、Weiqi Tong、Weichao Xue、Hegui Gong
DOI:10.1021/acs.orglett.1c00313
日期:2021.3.19
A nickel-catalyzed reductive coupling of aryl triflates with thiocarbonates is reported here. Both electron-rich and -deficient aryl C(sp2)–O electrophiles as well as a class of O-tBu S-alkyl thiocarbonates are compatible with the optimized reaction conditions, as evidenced by 49 examples. The reaction also proceeds with good chemoselective cleavage of the C–O bond with regard to thioesters. This work
此处报道了芳基三氟甲磺酸酯与硫代碳酸酯的镍催化还原偶联。富电子和不足的芳基C(sp 2)-O亲电体以及一类O - t Bu S-烷基硫代碳酸酯都与优化的反应条件兼容,如49个实例所示。对于硫代酯,该反应还会以良好的C–O键化学选择性裂解来进行。这项工作拓宽了镍催化的还原交叉亲电子偶联反应的范围。
Umpolung Strategy for Arene C−H Etherification Leading to Functionalized Chromanes Enabled by I(III)
<i>N</i>
‐Ligated Hypervalent Iodine Reagents
作者:Myriam Mikhael、Wentao Guo、Dean J. Tantillo、Sarah E. Wengryniuk
DOI:10.1002/adsc.202100809
日期:2021.11.9
The direct formation of aryl C−O bonds via the intramolecular dehydrogenativecoupling of a C−H bond and a pendant alcohol represents a powerful synthetic transformation. Herein, we report a method for intramolecular arene C−H etherification via an umpoled alcohol cyclization mediated by an I(III) N-HVI reagent. This approach provides access to functionalized chromane scaffolds from primary, secondary
Total Synthesis of Camptothecin and Related Natural Products by a Flexible Strategy
作者:Ke Li、Jinjie Ou、Shuanhu Gao
DOI:10.1002/anie.201607832
日期:2016.11.14
strategy for constructing natural products containing indolizinone or quinolizinone scaffolds and their analogues was developed, which was based on a cascade exo hydroamination followed by spontaneous lactamization. This method was applied in the total synthesis of camptothecin in nine steps in a newring‐forming approach. It was also used to efficiently prepare five biogenetically or structurally related