An alkoxide-directed alkyne–allene cross-coupling for stereoselective synthesis of 1,4-dienes
作者:Heidi L. Shimp、Glenn C. Micalizio
DOI:10.1039/b708256h
日期:——
A titanium alkoxide-mediated convergent coupling between internal alkynes and allenes is described for the regio- and stereocontrolled synthesis of substituted acyclic 1,4-dienes.
Reprint of “Allene–alkyne cross-coupling for stereoselective synthesis of substituted 1,4-dienes and cross-conjugated trienes”
作者:Heidi L. Shimp、Alissa Hare、Martin McLaughlin、Glenn C. Micalizio
DOI:10.1016/j.tet.2008.03.086
日期:2008.7
Titanium-mediated cross-coupling of allenic alcohols with alkynes has been investigated. Divergent reaction pathways were discovered that provide either stereodefined 1,4-dienes or substituted cross-conjugated trienes. In short, allene substitution plays a critical role in the determination of reaction pathway.
Synthesis of multi-substituted dihydrofurans <i>via</i> palladium-catalysed coupling between 2,3-alkadienols and pronucleophiles
作者:Hirokazu Tsukamoto、Kazuya Ito、Takayuki Doi
DOI:10.1039/c8cc02589d
日期:——
Multi-substituted dihydrofurans were obtained from a palladium-catalysed coupling reaction between 2,3-alkadienols and ketones bearing an electron-withdrawing group at the α-position. Methanol as a solvent was essential for the initial dehydrative substitution to suppress the competitive hydroalkylation of the diene moiety. The substitution would be followed by intramolecular hydroalkoxylation under