Phosphoric Acid Catalyzed <i>N</i>-Addition/ <i>C</i>-Addition Reaction of 3-Vinyl Indoles with Pyrazole/Pyrazolone to Construct Pyrazole-Substituted 3-(1-Heteroarylethyl)-indole Scaffolds
作者:Jie Luo、Ji-Xing Zhao、Tao He、Ping Liu、Chun-Tian Li
DOI:10.1021/acs.joc.3c02866
日期:——
efficient atom-economic method for the preparation of 3-(1-heteroarylethyl)-indole scaffolds is of significant value in pharmaceutical and agricultural chemistry. Herein, a phosphoric acid-catalyzed N-addition reaction of 3-vinyl indoles with pyrazoles and C-addition reaction of 3-vinyl indoles with pyrazolones were developed. A series of pyrazole-substituted 3-(1-heteroarylethyl)-indole scaffolds were
Syn‐gled out: The syn diastereo‐ and enantioselective addition of azlactones to 3‐vinylindoles was accomplished by using a chiral, binapthol‐derived, Brønstedacid catalyst (see scheme). This method enables facileaccess to tryptophanderivatives with adjacent quaternary and tertiary stereogenic centers, which are potentially useful for the synthesis of peptidomimetics.
Catalytic Enantioselective Diels–Alder Reactions of Benzoquinones and Vinylindoles with Chiral Magnesium Phosphate Complexes
作者:Yujia Bai、Jinping Yuan、Xiaoyue Hu、Jon C. Antilla
DOI:10.1021/acs.orglett.9b01437
日期:2019.6.21
Tetrahydrocarbazole and its derivatives have received much attention due to the prevalence of this scaffold in natural products and their use in organic synthesis. We have developed a Diels–Alderreaction of benzoquinones and 3-vinylindoles catalyzed by chiral magnesium phosphate complexes to provide tetrahydrocarbazole derivatives in excellent yields and enantioselectivities (up to >99% yield, 99%