An efficient asymmetric intramolecular trapping of ammonium ylides of α-diazoketones with enones to synthesize indoline derivatives was realized. A Rh(II)/chiralN,N′-dioxide−Sc(III) complex bimetallic relay catalytic system was established. A series of optically active 2,2,3-trisubstituted indolines were obtained in high yields (up to 99%), good enantioselectivities (up to 99% ee), and excellent
Expedient Access to Enantioenriched 1‐Azaspiro Cyclobutanones Enabled by Modified Heyns Rearrangement
作者:Shibaram Panda、Prasanta Ghorai
DOI:10.1002/anie.202306179
日期:2023.8.7
4]-azaspirocycles by employing the Heyns reactivity upon its electrophilic modification. The chiral phosphoric acid is an efficient catalyst for this transformation and allows to access a wide range of cyclobutanone containing 1-azaspirocycles with excellent enantio- and diastereoselectivities.
A domino reaction comprising four consecutive steps based on the strategy of isomerization of allylicalcohols was developed. This base‐catalyzed protocol provided an approach for constructing polysubstituted quinolines without additional additives. A wide range of di‐ or trisubstituted γ‐aminoaryl allylicalcohols bearing alkyl or (hetero)aryl substituents were transformed to the structurally diverse