Intramolecular Hydrosilylation and Silicon-Assisted Cross-Coupling: An Efficient Route to Trisubstituted Homoallylic Alcohols
摘要:
[GRAPHICS]Alkylidenesilacyclopentanes (formed by intramolecular hydrosilylation of homopropargyl alcohols) are efficiently coupled with aryl or alkenyl halides in the presence of tetrabutylammonium fluoride and a palladium(0) catalyst. Yields of cross-coupling were generally high, and the reaction is compatible with a wide range of functional groups. The overall transformation achieves the conversion of homopropargyl alcohols to trisubstituted homoallylic alcohols in a highly stereoselective fashion.
An Alkoxide-Directed Carbometalation of Internal Alkynes
作者:Jamie Ryan、Glenn C. Micalizio
DOI:10.1021/ja057352w
日期:2006.3.1
A mild and efficient alkoxide-directed carbometalation is described. Regioselective carbon-carbon bond formation occurs in all cases at the site distal to the tethered alkoxide. This reaction provides a convenient means to prepare differentially functionalized tetrasubstituted 1,3-dienes in a regio- and stereoselective manner.