Stereoselective Olefination Reactions Promoted by Rieke Manganese
作者:José Concellón、Humberto Rodríguez-Solla、Vicente del Amo、Pamela Díaz
DOI:10.1055/s-0029-1216880
日期:2009.8
applied to develop a novel and direct synthesis of (E)-α,β-unsaturated esters or amides and (Z)-α,β-unsaturated α-halo esters and α-choroamides through a Mn*-mediated sequential olefination protocol of aldehydes with dichloro esters or amides and trihalo esters or trichloroamides, respectively. manganese - elimination reactions - stereoselectivity - α,β-unsaturated esters - α,β-unsaturated amides - metalation
A facile and convenient protocol for the synthesis of cinnamides from cinnamic acids and tetraalkylthiuram disulfides under metal and additive free conditions has been achieved. This method allows the efficient coupling of diverse cinnamic acids with tetraalkylthiuram disulfides through a simply mixing operation.
[3]Dendralene Synthesis: Rhodium(III)-Catalyzed Alkenyl CH Activation and Coupling Reaction with Allenyl Carbinol Carbonate
作者:Honggen Wang、Bernhard Beiring、Da-Gang Yu、Karl D. Collins、Frank Glorius
DOI:10.1002/anie.201306754
日期:2013.11.18
[3]DendrAl(l)ene! A new synthesis of [3]dendralenes is based on a RhIII‐catalyzed alkenyl CH activation and coupling reaction with allenyl carbinol carbonates (see scheme; DG=directing group). A variety of [3]dendralenes with diverse substitution patterns are accessible with good efficiency. The reaction is highly stereoselective and compatible with different directing groups and numerous functional
Sequential Reactions Promoted by Manganese: Completely Stereoselective Synthesis of (<i>E</i>)-α,β-Unsaturated Amides, Ketones, Aldehydes, and Carboxylic Acids
作者:José M. Concellón、Humberto Rodríguez-Solla、Pamela Díaz
DOI:10.1021/jo701417z
日期:2007.10.1
A complete E-selective synthesis of a,alpha,beta-unsaturated amides through a sequential reaction of a range of dichloroamides with a variety of aldehydes promoted by Rieke manganese (Mn*) is reported. A mechanism based on a sequential aldol-type reaction and a completely stereoselective beta-elimination is proposed to explain these results. The unsaturated amides obtained are readily and efficiently transformed into alpha,beta-unsaturated ketones, aldehydes, or carboxylic acids without loss of the diastereoisomeric purity of the C-C double bond.