Enantioselective Conia-Ene-Type Cyclizations of Alkynyl Ketones through Cooperative Action of B(C6F5)3, N-Alkylamine and a Zn-Based Catalyst
An efficient and highly enantioselective Conia-ene-type process has been developed. Reactions are catalyzed by a combination of B(C6F5)3, an N-alkylamine and a BOX-ZnI2 complex. Specifically, through cooperative
Cao, Min,Yesilcimen, Ahmet,Wasa, Masayuki
supporting information
p. 4199 - 4203
(2019/04/13)
Direct spirocyclization from keto-sulfonamides: An approach to azaspiro compounds
Spontaneous spirocyclization of keto-sulfonamides via ynamides through a one-pot process is presented. Push-pull ynamides were obtained through Michael addition/elimination without Cu. The obtained azaspiro compounds are building blocks for indole alkaloids. Theoretical studies provide insights into the mechanism of the formal Conia-ene reaction.
Photoreactivity of α-Tetrasubstituted Arylketones: Production and Asymmetric Tautomerization of Arylenols
In the presence of catalytic amounts of optically active aminoalcohols, the irradiation of α-disubstituted indanones, tetralones and propiophenones bearing at least one hydrogen in the γ-position led to Norrish type II cleavage compounds which were obtained with enantiomeric excesses reaching 89percent.The influence of the reaction conditions (temperature, wavelength of the UV light and nature of the aminoalcohol) has been analyzed.