Cyclobutenes from alkynes and silyl enol ethers

Xiaoming Feng and co-workers from Sichuan University have reported in ACIE on a Zn-catalyzed [2+2] reaction between alkynones and cyclic silyl enol ethers.

 

ACIE paper

Fe-catalyzed [2+2]

Paul Chirik and co-workers from Princeton have reported in Science on an iron catalyzed [2+2] cycloaddition.

Science paper

[2+2] stereochemistry

Thorsten Bach and co-workers at Technische Universität München have reported in JACS on the stereochemistry of some [2+2] reactions.

JACS paper

[2+2] via oxazaborolidine

M. Kevin Brown and co-workers at Indiana University have reported in JACS on an asymmetric [2+2] using an oxazaborolidine catalyst.

JACS paper

Strained alkynes are in

Rick Danheiser and colleague have reported in JACS on the synthesis of an aza-cyclohexyne to do the chemistries that other people have been doing with benzynes.

JACS paper

Dictazole synthesis

Grey Erwan Poupon and co-workers at CNRS have reported in ACIE on the synthesis of dictazole.

ACIE paper

Asymmetric [2+2]

Tehshik Yoon and co-workers published in Science on an enantioselective [2+2] reaction.

Science paper

Asymmetric [2+2]

Thorsten Bach and colleague have reported in Science on a Lewis acid catalyzed [2+2] reaction.

 

Science paper

Gold catalyzed [2+2]

Antonio Echavarren and co-workers from ICIQ in Spain have reported in Org Lett on a gold catalyzed intramolecular [2+2] between an alkene and alkyne.

OL paper

That’s pretty strained

Fumitoshi Kakiuchi and co-workers from Keio University have reported in Org Lett on a rhodium catalyzed [2+2] reaction between a terminal alkyne and an electron deficient alkene to form a cyclobutene.

OL paper