Lewis Acid-Catalyzed Remote Site-Selective Ring Deconstruction of Cyclobuteno[]naphthalene-4-ones to Access Unsymmetric 1,1-Diarylated Olefins.

A catalytic site-selective ring deconstruction of cyclobuteno[]naphthalene-4-ones with alcohols is reported, enabling the direct production of a wide range of unsymmetric 1,1-diarylated olefins with good yields and complete regioselectivity. The late-stage application of these resulting terminal olefins demonstrates great possibilities to apply this strategy to complex molecules. The protocol features good functional group compatibility, broad substrate scope, and controllable site selectivity.

Regio- and Enantioselective Synthesis of Dihydropyrido[1,2-]indoles via Catalytic Asymmetric Annulative Allylic Alkylation.

A palladium-catalyzed asymmetric annulative allylic alkylation reaction of 2-[(1-indol-2-yl)methyl]malonates with ()-but-2-ene-1,4-diyl dicarbonates is described, leading to the regio- and enantioselective synthesis of dihydropyrido[1,2-]indoles with a chiral cyclic allyl stereocenter adjacent to the ring-junction nitrogen atom in moderate to good yields. The salient features of this protocol include mild conditions, a broad substrate scope, and good compatibility with substituents as well as high regio- and stereoselectivities, providing a catalytic asymmetric entry for fabricating chiral pyridoindole scaffolds.

In vivo antioxidant activity of Cinnamomum cassia leaf residues and their effect on gut microbiota of d-galactose-induced aging model mice.

Background: To thoroughly explore the values of Cinnamomum cassia leaf residues (CcLR), their antioxidant activity in vivo and the relationship with gut microbiota were investigated using d-galactose-induced aging mice.

Results: Results showed that CcLR extract treatment exerted antioxidant activity by increasing the levels of superoxide dismutase (P < 0.01) and glutathione peroxidase (P < 0.

Diastereoselective Synthesis of 1,2-Dihydrobenzofuro[3,2-]pyridines via a Carbon-Carbon Double-Bond Cleavage/Rearrangement Cascade.

A new Lewis acid-catalyzed [2 + 2] cycloaddition/retroelectrocyclization (CA-RE)/1,6-addition relay of aurone-derived 1-azadienes and 1-alkynylnaphthalen-2-ols has been reported, leading to the regio- and diastereoselective synthesis of 1,2-dihydrobenzofuro[3,2-]pyridine with a chiral carbon center and an axial chirality in good yields. This protocol enables the C-C double-bond scission/recombination to rapidly construct aza-heterocyclic architectures and features 100% atom utilization, a wide substrate scope, good compatibility with substituents, and excellent diastereoselectivity.