A chiral SPINOL derived phosphoric acid-catalyzed asymmetric N-alkylation reaction of indoles with cyclic α-diaryl-substituted N-acyl imines, which are generated in situ from 3-aryl 3-hydroxyisoindolinones, has been demonstrated. The transformation proceeds smoothly with a broad range of indoles and isoindolinone alcohols. A variety of indole derived N-alkylated tetrasubstituted chiral aminals were
Enantioselective Synthesis of Difluoroalkylated Isoindolinones via Chiral Spirocyclic Phosphoric Acid Catalyzed Mannich-Type Reaction
作者:Xufeng Lin、Lei Wang、Jialing Zhong
DOI:10.1055/a-1274-2959
日期:2021.3
An enantioselective Mannich-type reaction of in situ generated cyclic ketimines with difluoroenoxysilanes catalyzed by chiral spirocyclic phosphoric acid has been developed. This methodology provides a facile route to difluoroalkyl-substituted chiral isoindolinones bearing a quaternary stereogenic center in high yields and up to 96% enantioselectivity.
An iridium/chiral diene complex efficiently catalyzedenantioselective (3+2) annulation between 1,3‐enynes and cyclic N‐acyl ketimines generated in situ from 3‐aryl‐3‐hydroxyisoindoin‐1‐ones. The reaction gave the corresponding aminoindane derivatives in high yields with high regio‐, diastereo‐, and enantioselectivity.
Rh(<scp>iii</scp>)-catalyzed [3 + 3] spirocyclization of 3-aryl-3-hydroxyisoindolinones with vinylene carbonate as a three-atom unit
作者:Hai-Shan Jin、Cai-Cai Liang
DOI:10.1039/d3ob00796k
日期:——
vinylene carbonate is used as the coupling partner and acts as a three-atom synthon (C–C–O) through the decarboxylation process. This atom-economic reaction worked efficiently under mild conditions via a C–Hactivation pathway. It is the first example where 3-aryl-3-hydroxyisoindolinones are used as the buildingblocks to construct spiroheterocycles.