The asymmetric aziridination of cyclicenones with N-tosyloxycarbamates, using N-neopentyl 1,2-diphenylethylenediamine as a catalyst, and its application to the formal total synthesis of (−)-agelastatin A, using a one-pot silylation-selenylation procedure and the regioselective aziridine-opening by an azide anion as key steps, are described.
Cooperative catalysis: An easily available new type of primary–secondary diamine was synthesized as a highly efficient bifunctionalcatalyst in the asymmetric crossed‐conjugateaddition of β,β‐dialkyl nitroalkenes to α,β‐unsaturated acyclic or cyclic ketones for the first time. The wide substrate scope, excellent yield (up to 96 %) and enantioselectivity (up to 99 % enantiomeric excess (ee)) under
tosyl-substituted bis(imidazolidine)pyridine Ts-PyBidine-nickel complex was an efficient catalyst for Friedel-Crafts reaction of indoles with methylene indolinones to give bisindolylmethane compounds having differently oxidized indole units with high enantioselectivities. Alkylation of the products proceeded smoothly in a highly diastereoselective manner, providing an all-carbon quaternary carbon center