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Archive for the ‘Transition Metal’ Category

Reactions involving transition metals

Towards halichondrins

Posted by naturalproductman on May 12, 2015

I would call the vinyl halide coupling reaction with an aldehyde using chromium/nickel combination a Nozaki Hiyama Kishi coupling, but maybe because the author is one of the people in the named reaction, it wasn’t mentioned in the paper as the “NHK reaction”, but rather, a Ni/Cr-mediated reaction.

halichondrin

JACS paper

JACS paper 2

Posted in Chromium, cross coupling, Methodology, Named Reactions, Nickel, Polyketides, Total Synthesis | Leave a Comment »

Oxygen transfer

Posted by naturalproductman on May 2, 2015

Chepuri Ramana and colleague at CSIR have reported in Organic Letters on a ruthenium catalyzed oxygen transfer reaction.
oxygen

OL paper

Posted in Methodology, Ruthenium, Transition Metal | Leave a Comment »

Methylene transfer

Posted by naturalproductman on May 2, 2015

Itaru Nakamura and co-workers from Tohoku University have reported in ACIE on a gold catalyzed methylene transfer sequence to access isoxazolines.

methylene

ACIE paper

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

Disorazole synthesis through metathesis

Posted by naturalproductman on May 2, 2015

Alison Hulme and co-workers from the University of Edinburgh have reported in ACIE on a metathesis approach to disorazole. Reminds me of the Hoveyda approach.

metathesis

ACIE paper

Posted in Asymmetric, C2-Symmetric, Metathesis, Methodology, Molybdenum, Transition Metal | Leave a Comment »

Cyclopropanation with iron(III) phthalocyanine

Posted by naturalproductman on May 2, 2015

Emily Balskus and colleague have reported in ACIE on an iron(III) phthalocyanine catalyst that can perform cyclopropanation reactions. Reminds me of the P450 version that was published a few years back.

cyclopropanation
ACIE paper

Posted in Enzymes, Iron, Methodology, Transition Metal | Leave a Comment »

The cousin of the Saegusa-Ito oxidation

Posted by naturalproductman on May 2, 2015

Timothy Newhouse and co-workers at Yale have reported in JACS on an interesting way to make alpha,beta-unsaturated esters and nitriles from saturated starting materials.

unsaturation

JACS paper

Posted in Palladium, Transition Metal | Leave a Comment »

Reverse Claisen cascade

Posted by naturalproductman on April 16, 2015

Yongjia Shang and co-workers from Anhui Normal University have reported in JOC on an interesting iron catalyzed cascade reaction.

JOC paper

Posted in Cascade Reactions, Claisen rearrangement, Iron, Methodology, Sigmatropic Rearrangements, Transition Metal | Leave a Comment »

Mn catalyzed C-H azidation

Posted by naturalproductman on April 16, 2015

Jay Groves and co-workers have reported in JACS on a Mn-catalyzed C-H azidation reaction.

Mn

JACS paper

Posted in C-H activation, Manganese, Methodology, Transition Metal | Leave a Comment »

Pd-catalyzed DKR

Posted by naturalproductman on April 16, 2015

Xinjun Luan and co-workers have reported in JACS on a palladium catalyzed dynamic kinetic resolution of biaryls to spirocyclic centers.

spirocycle

JACS paper

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

A Formal Metathesis

Posted by naturalproductman on April 16, 2015

Zhang Jie-Shi and co-workers from the Chinese Academy of Sciences have reported in JACS on a rhodium catalyzed exchange between an aryl keton and an aryl carboxylic acid to form aliphatic carboxylic acids and biaryl compounds.

cascade

JACS paper

Posted in Cascade Reactions, Metathesis, Methodology, Rhodium, Transition Metal | Leave a Comment »

 
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