Rhodium-Catalyzed Three-Component Reaction between Silylacetylene and Two Ketenes Leading to 1,3-Enynes Bearing a Carboxylic Ester Group via Double Insertion of Ketenes
摘要:
The first cross-reaction between a terminal silylacetylene and two ketene molecules leading to 1,3-enynes bearing a carboxylic ester group via double insertion of ketenes is achieved using a cationic rhodium complex catalyst. This reaction is applicable for various symmetrical and unsymmetrical ketenes with good stereoselectivities.
Nickel-Catalyzed Asymmetric Addition of Alkyne CH Bonds across 1,3-Dienes Using Taddol-Based Chiral Phosphoramidite Ligands
作者:Masamichi Shirakura、Michinori Suginome
DOI:10.1002/anie.201001188
日期:——
Enantioenriched 3‐methyl‐1,4‐enynes are the products of the title reaction. The terminal α‐siloxy‐sec‐alkyl groups were then converted into γ‐oxoalkyl groups by rhodium‐catalyzed conjugate alkynyl addition to α,β‐unsaturated ketones through cleavage of the alkynyl CC bond.
Rhodium-Catalyzed Three-Component Reaction between Silylacetylene and Two Ketenes Leading to 1,3-Enynes Bearing a Carboxylic Ester Group via Double Insertion of Ketenes
作者:Kenichi Ogata、Itsuki Ohashi、Shin-ichi Fukuzawa
DOI:10.1021/ol301897h
日期:2012.8.17
The first cross-reaction between a terminal silylacetylene and two ketene molecules leading to 1,3-enynes bearing a carboxylic ester group via double insertion of ketenes is achieved using a cationic rhodium complex catalyst. This reaction is applicable for various symmetrical and unsymmetrical ketenes with good stereoselectivities.