Cross-Coupling Reaction of Saccharide-Based Alkenyl Boronic Acids with Aryl Halides: The Synthesis of Bergenin
作者:Kamil Parkan、Radek Pohl、Martin Kotora
DOI:10.1002/chem.201304304
日期:2014.4.7
isolated yields was achieved. Both pinacol boronates were tested in a series of cross‐coupling reactions under Suzuki–Miyaura cross‐coupling conditions to obtain the corresponding aryl, heteroaryl, and alkenyl derivatives in high isolated yields. This methodology was applied to the formal synthesis of the glucopyranoside moiety of papulacandin D and the first total synthesis of bergenin.
A short route to “reverse-prenylated” pyrrolo[2,3-b]indolesvia tandem olefination and claisen rearrangement of 2-(3,3-dimethylallyloxy)indol-3-ones: First total synthesis of flustramine C
1-acetyl-2-(3,3-dimethylallyloxy)indol-3-ones proceeded via tandemolefination, isomerization, Claisenrearrangement, and deacetylation to give 3-cyanomethyl-3-(1,1-dimethylallyl)indol-2-ones in good yields, which were reduced with Red-Al® to afford pyrrolo[2,3-b]indoles having the 1,1-dimethylallyl group at the 3a-position. The firsttotalsynthesis of the marine alkaloid flustramineC was also described
Rhodium-Catalyzed Annulative Coupling Using Vinylene Carbonate as an Oxidizing Acetylene Surrogate
作者:Koushik Ghosh、Yuji Nishii、Masahiro Miura
DOI:10.1021/acscatal.9b04254
日期:2019.12.6
Transition-metal-catalyzed C–Hactivation and subsequent oxidative cyclization with alkynes has been a powerful tool for the synthesis of polycyclic aromatic compounds. Despite the substantial progress in this field, it is still a significant challenge to establish synthetic methodologies for the construction of nonsubstituted vinylene-fused aromatics. We herein report a Rh(III)-catalyzed C–H/N–H annulation with vinylene
Electrochemically enabled functionalization of indoles or anilines for the synthesis of hexafluoroisopropoxy indole and aniline derivatives
作者:Zu-Yu Mo、Xin-Yu Wang、Yu-Zhen Zhang、Li Yang、Hai-Tao Tang、Ying-Ming Pan
DOI:10.1039/d0ob00157k
日期:——
electrochemically enabled site-selective functionalization of indole or aniline derivatives with hexafluoroisopropanol in the presence of tetrabutyl ammonium hexafluorophosphate as the redox catalyst and electrolyte was demonstrated in this work. Under mild electro-oxidation conditions, a series of hexafluoroisopropoxy indole and aniline derivatives with pharmacological activity were obtained. This conversion