A New Two-Step Four-Component Synthesis of Highly Functionalized Cyclohexenols by Sequential Nickel-Catalyzed Couplings
作者:Mario Lozanov、John Montgomery
DOI:10.1021/ja0175845
日期:2002.3.1
A new two-step procedure for the synthesis of cyclohexenols has been developed. A nickel-catalyzedthree-componentaddition of an enal, alkyne, and acetylenic tin affords substituted hept-4-en-6-ynals. The products of this first step then undergo a second nickel-catalyzedreaction with organozincs or organoboranes to afford densely functionalized cyclohexenols. Variation in each of the four components
Two sequential nickel-catalyzed reactions allow the preparation of highly functionalized alkylidene cyclohexenols. Dehydration of the resulting cycloadducts allows the preparation of densely functionalized aromatic ring systems, whereas a simple sequence involving oxidation followed by carbonyl addition or enolization allows additional diversity incorporation.
Palladium-Catalyzed Coupling Reactions of N-Methoxy-N-methylcarbamoyl Chloride for the Synthesis of N-Methoxy-N-methylamides
作者:Masahiro Murakami、Yujiro Hoshino、Hajime Ito、Yoshihiko Ito
DOI:10.1246/cl.1998.163
日期:1998.2
A new synthetic method of N-methoxy-N-methylamides is developed. The palladium-catalyzedcouplingreaction of N-methoxy-N-methylcarbamoyl chloride furnished N-methoxy-N-methylamide in moderate to good yield, wherein a carbonyl equivalent was appended to sp and sp2 carbon atoms as a versatile synthetic basis for further manipulation.
The Antiadhesive Strategy in Crohn′s Disease: Orally Active Mannosides to Decolonize Pathogenic<i>Escherichia coli</i>from the Gut
作者:Dimitri Alvarez Dorta、Adeline Sivignon、Thibaut Chalopin、Tetiana I. Dumych、Goedele Roos、Rostyslav O. Bilyy、David Deniaud、Eva-Maria Krammer、Jérome de Ruyck、Marc F. Lensink、Julie Bouckaert、Nicolas Barnich、Sébastien G. Gouin
DOI:10.1002/cbic.201600018
日期:2016.5.17
Ready for take off? Adherent‐invasive E. coli (AIEC) were shown to promote the inflammation of the intestinal mucosa of patients with Crohn′sdisease (CD). We have designed a small library of AIEC antiadhesives, one of which could decolonize AIEC from the gut of a transgenic CD mouse model. These might open new perspectives in the treatment of CD.
Synthesis of 2-aryl-1,1-difluoro-1,3-enynes via consecutive cross-coupling reactions of 2,2-difluoro-1-iodoethenyl p-toluenesulfonate
作者:Ju Hee Kim、Ye Rim Jeong、Sung Lan Jeon、In Howa Jeong
DOI:10.1016/j.jfluchem.2014.07.007
日期:2014.11
Alkynylation reaction of 2,2-difluoro-1-iodoethenyl p-toluenesulfonate 1 with alkynyltributylstannanes in the presence of 10 mol% Pd(PPh3)4 and 10 mol% CuI in THF at reflux temperature for 3 h provided the corresponding 1,1-difluoro-1,3-enynyl tosylates 2 in 65–85% yields. The further arylation reaction of 2 with aryltributylstannanes in the presence of 10 mol% Pd(PPh3)2Cl2 and 3 equiv. of LiBr in