Asymmetric epoxidation of α,β-unsaturated ketones via an amine-thiourea dual activation catalysis
Sign Up to like & getrecommendations! Published in 2021 at "Tetrahedron Letters"
DOI: 10.1016/j.tetlet.2021.152941
Abstract: Abstract A simple asymmetric epoxidation method is developed to effectively synthesize chiral α-carbonyl epoxides through an amine-thiourea dual activation catalysis. In this method, TBHP, as an oxidant, determined the reaction rate, and the chiral amine-thiourea… read more here.
Keywords: thiourea dual; activation catalysis; unsaturated ketones; dual activation ... See more keywords
Asymmetric Epoxidation of 1,4-Naphthoquinones Catalyzed by Guanidine-Urea Bifunctional Organocatalyst.
Sign Up to like & getrecommendations! Published in 2018 at "Organic letters"
DOI: 10.1021/acs.orglett.8b00641
Abstract: An enantioselective nucleophilic epoxidation of 2-substituted 1,4-naphthoquinones in the presence of a newly developed guanidine-bisurea bifunctional organocatalyst with tert-butyl hydroperoxide (TBHP) as an oxidant is presented. 1,4-Naphthoquinones bearing substituents at C6, C7, and C2 were… read more here.
Keywords: asymmetric epoxidation; naphthoquinones catalyzed; epoxidation; bifunctional organocatalyst ... See more keywords
Asymmetric epoxidation of α,β-unsaturated ketones catalyzed by rare-earth metal amides RE[N(SiMe3)2]3 with chiral TADDOL ligands
Sign Up to like & getrecommendations! Published in 2021 at "New Journal of Chemistry"
DOI: 10.1039/d0nj05228k
Abstract: The catalytic asymmetric epoxidation of α,β-unsaturated ketones by tert-butylhydroperoxide (TBHP) has been well established using rare-earth metal amides RE[N(SiMe3)2]3 (RE = La(1), Nd(2), Sm(3), Y(4), Yb(5)) with chiral TADDOL ligands. It was found that the… read more here.
Keywords: epoxidation unsaturated; chiral taddol; unsaturated ketones; sime3 chiral ... See more keywords
Asymmetric Epoxidation of Olefins with Sodium Percarbonate Catalyzed by Bis-amino-bis-pyridine Manganese Complexes
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DOI: 10.3390/molecules27082538
Abstract: Asymmetric epoxidation of a series of olefinic substrates with sodium percarbonate oxidant in the presence of homogeneous catalysts based on Mn complexes with bis-amino-bis-pyridine ligands is reported. Sodium percarbonate is a readily available and environmentally… read more here.
Keywords: bis; bis amino; asymmetric epoxidation; epoxidation ... See more keywords