The First Tandem [2 + 2] Cycloaddition−Michael Reaction Using Ynolates: Facile Construction of Substituted Carbocycles
摘要:
[GRAPHICS]A tandem [2 + 2] cycloaddition-Michael reaction using ynolate anions followed by decarboxylation produced polysubstituted five-, six-, and seven-membered cycloalkenes.
Selective 1,4-reduction of unsaturated carbonyl compounds using Co2(CO)8–H2O
作者:Hee-Yoon Lee、Mihyun An
DOI:10.1016/s0040-4039(03)00462-3
日期:2003.3
α,β-Unsaturated ketones and aldehydes were selectively reduced to the corresponding saturatedcarbonyl compounds by Co2(CO)8–H2O system. The current reducing system also offered a chemoselective reduction of less substituted unsaturated carbonylgroups.
A Practical, efficient, and atom economic alternative to the Wittig and Horner–Wadsworth–Emmons reactions for the synthesis of (E)-α,β-unsaturated esters from aldehydes
作者:Benjamin List、Arno Doehring、Maria T. Hechavarria Fonseca、Andreas Job、Ramon Rios Torres
DOI:10.1016/j.tet.2005.09.081
日期:2006.1
efficient new methodology for the synthesis of (E)-α,β-unsaturatedestersfromaldehydes. In our DMAP-catalyzed reaction, both aromatic as well as aliphatic aldehydes furnish the desired products highly regio- and stereoselectively if treated with commercially available or synthetically easily accessible malonic acid half ester. A large scale application in the synthesis of p-methoxycinnamates, which are
Practical Synthesis of (E)-α,β-Unsaturated Esters from Aldehydes
作者:Benjamin List、Arno Doehring、Maria T. Hechavarria Fonseca、Kathrin Wobser、Hendrik van Thienen、Ramon Rios Torres、Pedro Llamas Galilea
DOI:10.1002/adsc.200505196
日期:2005.10
Based on a modification of the Doebner–Knoevenagel reaction, a practical and highly efficient synthesis of α,β-unsaturated esters with excellent regio- and stereoselectivity was developed. The reactions are catalyzed by 4-dimethylaminopyridine in DMF at room temperature or below. Both aliphatic and aromatic aldehydes can readily be used in the process.
The development of a new catalytic process: Bu3SnH-catalyzed reductive cyclization of enals and enones
作者:David S Hays、Gregory C Fu
DOI:10.1016/s0040-4020(99)00446-9
日期:1999.7
By sequencing two known reactions, a new catalytic carbon-carbon bond-forming process, the Bu3SnH-catalyzed, PhSiH3-mediated reductive cyclization of enals and enones, has been developed. The addition of EtOH to the reactions leads to reproducibly good yields of the cyclized products; a rationale for including this additive is provided.