A method for the preparation of 3-alkylated spiro [4.5] trienones via alkylation/ipso-
cyclization of activated alkynes with 4-alkyl-DHPs under transition-metal-free conditions is …

A new, general method for the synthesis of spiro [4, 5] trienones is described by the
intramolecular ipso-halocyclization of 4-(p-unsubstituted-aryl)-1-alkynes. In the presence of …

A nitrogen‐centered radical strategy for the preparation of 3‐acylated spiro [4, 5] trienones
via visible‐light‐mediated acylation/ipso‐cyclization of alkynes with acyl oxime esters is …

A novel halogen-radical-promoted dearomative aza-spirocyclization of alkynylimines for the
synthesis of 3-halo-spirocyclohexadienones is described. In this process, it is believed that a …

A novel and direct oxidative spirocyclization of arylpropiolamides with sulfonylhydrazides
leading to 3-sulfonated azaspiro [4, 5] trienones has been developed under metal-free …

A general and efficient intramolecular electrophilic ipso-iodocyclization of para-unactivated
arylalkynes has been developed for the synthesis of spiro [4, 5] trienyl acetates. In the …

DTBP‐Mediated Cascade Spirocyclization and Dearomatization of Biaryl Ynones: Facile Access
to Spiro[5.5]trienones through C(sp3)−H Bond Functionalization - Zhang - 2021 - European …

An electrochemical dearomatizing spirocyclization of alkynes with dimethyl 2-
benzylmalonates for the preparation of spiro [4.5] deca-trienones has been developed. This …

The electrophilic cyclization of 2-(1-alkynyl)-2-alken-1-ones in the presence of various
alcohols or carbon-based nucleophiles offers an efficient and straightforward route to highly …

The samarium diiodide-induced 6-trig cyclizations of substituted g-arylketones 1, 4, 5, 9, 11,
and 14 are strongly influenced by substituents of the aryl group. Whereas para-methoxy …