Terminal Alkyne−Ethylene Cross-Metathesis: Reaction of 1-Substituted Propargyl Esters at Elevated Ethylene Pressure
作者:Jason A. Smulik、Steven T. Diver
DOI:10.1021/jo9916941
日期:2000.3.1
elevated pressure (4 atm) to give 2-substituted butadienes in good to excellent yields. Enantioenriched propargylic acetates, obtained through enzymatic kinetic resolution of secondary propargyl alcohols, similarly underwent ethylene metathesis with retention of stereochemistry at the chiral center.
Expanded Scope in Ethylene−Alkyne Cross-Metathesis: Coordinating Heteroatom Functionality at the Propargylic Position
作者:Jason A. Smulik、Steven T. Diver
DOI:10.1021/ol006035l
日期:2000.7.1
[GRAPHICS]The Grubbs 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene-substituted ruthenium complex 1 catalyzed ethylene-alkyne cross-metathesis and was shown to tolerate free hydroxyl groups and coordinating functionality at the propargylic and homopropargylic positions, Hindered and enantiomerically enriched 1-substituted alkynes also react efficiently under the reported conditions.
Tandem Enyne Metathesis and Claisen Rearrangement: A Versatile Approach to Conjugated Dienes of Variable Substitution Patterns
作者:Daniel A. Clark、Amol A. Kulkarni、Kyle Kalbarczyk、Bryan Schertzer、Steven T. Diver
DOI:10.1021/ja063132m
日期:2006.12.1
enolate Claisen rearrangement. This reaction sequence provided conjugated dienes of higher substitution pattern than that obtained through a cross-enyne metathesis alone. The Ireland-Claisen was conducted across both acyclic and cyclic dienes produced from cross-metathesis and methylene-free enyne metathesis, respectively. In the case of cyclodienes, the Ireland-Claisen rearrangement produced s-trans