Enantioselective Dearomatization of Indoles by an Azoalkene‐Enabled (3+2) Reaction: Access to Pyrroloindolines
作者:Guang‐Jian Mei、Xiwen Tang、Yildiz Tasdan、Yixin Lu
DOI:10.1002/anie.201911686
日期:2020.1.7
The enantioselectivedearomatization of indoles by an organocatalytic (3+2) reaction has been established. The reaction makes use of simple indole derivatives as substrates, and employs azoalkenesreaction partners. A wide range of pyrroloindolines containing an all-carbon quaternary stereogenic center were readily prepared in high yields and with excellent enantioselectivities.
and synthetic pharmaceuticals. Here, a new gold-catalyzed cycloaddition of alkynes with azadienes to access tetrasubstituted pyrroles is demonstrated. The neighboring hydroxylmethyl group serves a very important directing group through an addition/cycloaddition/elimination cascade. Diverse polysubstituted pyrroles were synthesized in good yields under mild conditions in one step, and tricyclic pyrrole
Enantiodivergent Cyclization of Racemic Cyclohexadienones via Parallel Kinetic Asymmetric Transformation
作者:Xiang Gao、Bei-Bei Li、Yu-Wei Li、Xiao Xiao、Meng-Meng Liu、Guang-Jian Mei
DOI:10.1021/acs.orglett.4c02396
日期:2024.7.26
convert available racemic substrates into valuable enantioenriched products are urgently needed in organicsynthesis. Reported herein is the first parallel kinetic asymmetric transformation of racemic cyclohexadienones. Racemic cyclohexadienones are first diastereoselectively converted into a new pair of racemic transient dienol intermediates, which are then parallel protonated by chiral phosphoric acid