Synthesis of Cyclic Sulfones by Ring-Closing Metathesis
作者:Qingwei Yao
DOI:10.1021/ol017142y
日期:2002.2.1
A general and highly efficient synthesis of cyclic sulfones based on ring-closingmetathesis has been developed. The synthetic utility of the resulting cyclic sulfones was demonstrated by their participation in stereoselective Diels-Alder reactions and transformation to cyclic dienes by the Ramberg-Bäcklund reaction.
Polystyrene-Supported 1,5,7-Triazabicyclo[4.4.0]dec-5-ene as an Efficient and Reusable Catalyst for the Thiolysis of 1,2-Epoxides under Solvent-Free Conditions
Polystyrene-supported 1,5,7-triazabicyclo[4.4.0]dec-5-ene (PS-TBD) is an effective basiccatalyst for the thiolysis of the 1,2-epoxides 1a–e by the aryl- and alkyl-substituted thiols 2A–E under solvent-free conditions while its activity is remarkably reduced in MeCN. The reactions are totally anti-diastereoselective and generally highly C-β regioselective. The corresponding hydroxy sulfides have been