A new Lewis acid-catalyzed [2 + 2] cycloaddition/ retroelectrocyclization (CA-RE)/1,6-addition relay of aurone-derived 1azadienes and 1-alkynylnaphthalen-2-ols has been reported, leading to the regio-and diastereoselective synthesis of 1,2-dihydrobenzofuro[3,2-b]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.
A palladium-catalyzed
asymmetric annulative allylic alkylation
reaction of 2-[(1H-indol-2-yl)methyl]malonates with
(E)-but-2-ene-1,4-diyl dicarbonates is described,
leading to the regio- and enantioselective synthesis of dihydropyrido[1,2-a]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.
A catalytic site-selective ring deconstruction of cyclobuteno[a]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 latestage 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.
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