Decarboxylative and dehydrative coupling of dienoic acids and pentadienyl alcohols to form 1,3,6,8-tetraenes
作者:Ghina’a I Abu Deiab、Mohammed H Al-Huniti、I F Dempsey Hyatt、Emma E Nagy、Kristen E Gettys、Sommayah S Sayed、Christine M Joliat、Paige E Daniel、Rupa M Vummalaneni、Andrew T Morehead、Andrew L Sargent、Mitchell P Croatt
DOI:10.3762/bjoc.13.41
日期:——
Dienoic acids and pentadienyl alcohols are coupled in a decarboxylative and dehydrative manner at ambient temperature using Pd(0) catalysis to generate 1,3,6,8-tetraenes. Contrary to related decarboxylative coupling reactions, an anion-stabilizing group is not required adjacent to the carboxyl group. Of mechanistic importance, it appears that both the diene of the acid and the diene of the alcohol
Hydroxymethylation beyond Carbonylation: Enantioselective Iridium-Catalyzed Reductive Coupling of Formaldehyde with Allylic Acetates via Enantiotopic π-Facial Discrimination
作者:Victoria J. Garza、Michael J. Krische
DOI:10.1021/jacs.6b01078
日期:2016.3.23
2-propanol-mediated reductive coupling of branched allylic acetates 1a-1o with formaldehyde to form primary homoallylic alcohols 2a-2o with excellent control of regio- and enantioselectivity. These processes, which rely on enantiotopic π-facial discrimination of σ-allyliridium intermediates, represent the first examples of enantioselective formaldehyde C-C coupling beyond aldol addition.
SEGPHOS 修饰的手性铱配合物可催化 2-丙醇介导的支链烯丙乙酸酯 1a-1o 与甲醛的还原偶联,形成高烯丙醇 2a-2o,并具有出色的区域选择性和对映选择性控制。这些过程依赖于 σ-烯丙基铱中间体的对映体 π-面辨别,代表了羟醛加成以外的对映选择性甲醛 CC 偶联的第一个例子。
Reductive coupling of allylic acetates with carbonyl compounds by using Pd(0)-SmI2 system
electron-deficient imines with allylic alcohol derivatives in the presence of a catalytic amount of palladium(0) complex and indium(I) iodide was studied. The reversibility of allylation was observed in the reaction of glyoxylic oxime ether having camphorsultam. As the important effect of water on regioselectivity, the gamma-adducts were kinetically formed from monosubstituted allylic reagents in the presence