A vinylogous Michael reaction of 2-furanone dimers with α,β-unsaturated nitroolefins for constructing chiral γ,γ-disubstituted butenolides

An asymmetric vinylogous Michael reaction of 2-furanone dimers with α,β-unsaturated nitroolefins utilizing bifunctional thiourea as a catalyst has been developed, which provides an easy access to a wide range of chiral γ,γ-disubstituted butenolides.

Crystal structure of 1-((R)-(2′-(dimethylamino)-[1,1′-binaphthalen]-2-yl))-3-((S)-2-hydroxy-1-phenylethyl)thiourea, C31H29N3OS

C31H29N3OS, orthorhombic, P212121, (no. 19), a = 8.7252(5) Å, b = 15.6732(8) Å, c = 18.9746(9) Å, V = 2594.8(2) Å3, Z = 4, R gt(F) = 0.0689, wR ref(F 2) = 0.1179, T = 276(2) K.

Transition Metal-Free Intermolecular C(sp2)-H Direct Amination of Furanones via a Redox Pathway

A direct C(sp²)-H amination of 2-furanones under metal-free conditions was realized. This unprecedented intermolecular C-H to C-N conversion provides rapid access to 4-amino-furanone derivatives and novel aza-heterocycle fused furanone skeletons. A redox mechanism based on a double-Michael-addition intermediate INT2 is proposed and detected by spectrometry.

A novel chiral DMAP–thiourea bifunctional catalyst catalyzed enantioselective Steglich and Black rearrangement reactions

A novel chiral DMAP–thiourea bifunctional catalyst has been prepared and applied in the highly enantioselective Steglich and Black rearrangement reactions.