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Archive for the ‘Electrocyclization’ Category

4pi-Electrocyclic ring opening cascade

Posted by naturalproductman on July 23, 2015

Kiyosei Takasu and co-workers from Kyoto University have reported in JACS on a ring expansion cross coupling cascade.

JACS paper

Posted in Cascade Reactions, Electrocyclization, Methodology, Palladium, Transition Metal | Leave a Comment »

Newman-Kwart reaction mechanism

Posted by naturalproductman on July 13, 2015

Hafize Ozcan and co-workers from Trakya University in Turkey have reported in Tetrahedron on an interesting mechanistic investigation of the Newman-Kwart reaction.

Newman-Kwart

Tetrahedron paper

Posted in Cascade Reactions, Computational, DFT, Electrocyclization, Mechanistic, Methodology, Named Reactions, Newman-Kwart, Sigmatropic Rearrangements | Leave a Comment »

Aza-Nazarov

Posted by naturalproductman on November 29, 2014

G Sekar and co-workers from IIT Madras have reported in Chem Comm on an aza-Nazarov cyclization.

Chem Comm paper

Posted in Electrocyclization, Methodology, Named Reactions, Nazarov cyclization | Leave a Comment »

Electrocyclic ring opening to ketonitrones

Posted by naturalproductman on July 27, 2014

Masahiro Terada and co-workers from Tohoku University have reported in Organic Letters on a copper-catalyzed rearrangement to form alpha,beta-unsaturated ketonitrones.

nitrone

OL paper

Posted in Cascade Reactions, Copper, Electrocyclization, Mechanistic, Methodology, Pericyclic reactions, Transition Metal | Leave a Comment »

Another Nazarov? Or not.

Posted by naturalproductman on August 31, 2012

Zhang-Jie Shi and co-workers at Peking University have reported in Organic Letters on a palladium catalyzed cyclization process, which at first glance looked like it may be a Nazarov reaction but they proved that it probably is not a Nazarov reaction because of the observed kinetic isotope effect when they replaced the aryl hydrogens with deuteriums.

no not a Nazarov

OL paper

Posted in Cascade Reactions, Electrocyclization, Methodology, Named Reactions, Nazarov cyclization, Palladium, Pericyclic reactions, Transition Metal | Leave a Comment »

DFT calculations of a retro-Nazarov

Posted by naturalproductman on July 6, 2012

Satoshi Inagaki and co-workers at Gifu University have reported in JACS on some DFT calculations of a retro-Nazarov reaction.

retro Nazarov

JACS paper

Posted in Electrocyclization, Methodology, Named Reactions, Pericyclic reactions, retro-Nazarov | Leave a Comment »

Chromium cascade

Posted by naturalproductman on May 8, 2012

Nobuhara Iwasawa and co-workers at Tokyo Institute of Technology have reported in ACIE on a chromium catalyzed cascade.

chromium

ACIE paper

Posted in Cascade Reactions, Chromium, Electrocyclization, Light Mediated, Methodology, Transition Metal | Leave a Comment »

Atropurpuran progress

Posted by naturalproductman on December 14, 2011

Richard Hsung and co-workers have reported in Organic Letters on their progress towards atropurpuran.

atropurpuran

OL paper

Posted in Allenes, Diterpene, Electrocyclization, Methodology, Pericyclic reactions | Leave a Comment »

Roseophilin formal synthesis

Posted by naturalproductman on November 28, 2011

Junbiao Chang and co-workers at Zhengzhou University have reported in JOC on a formal synthesis of roseophilin.

roseophilin

JOC paper

Posted in Alkaloids, Cascade Reactions, Electrocyclization, Methodology, Named Reactions, Nazarov cyclization, Pericyclic reactions | Leave a Comment »

Eight membered ring from four membered ring

Posted by naturalproductman on November 21, 2011

Rick Danheiser and co-workers at MIT have reported in Tetrahedron on a way to make cyclo-octatrienes.

cyclooctatriene

Tetrahedron paper

Posted in Allenes, Electrocyclization, Methodology, Pericyclic reactions | Leave a Comment »

 
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