Picolinamide modified β-cyclodextrin/Pd (II) complex: Asupramolecular catalyst for Suzuki-Miyaura coupling of aryl, benzyl and allyl halides with arylboronic acids in water
作者:Kaixiu Luo、Lu Zhang、Rui Yang、Yi Jin、Jun Lin
DOI:10.1016/j.carbpol.2018.07.089
日期:2018.11
supramolecular catalysts for Suzuki-Miyauracoupling were prepared and characterized by NMR, FT-IR, TEM, XRD, TGA, and XPS. The resulting picolinamide-modified β-cyclodextrin/Pd(II) complex (Pd(II)@PCA-β-CD) showed very efficient catalytic activity for Suzuki-Miyauracoupling of aryl, benzyl, and allyl halides with arylboronic acids in an environmentally benign aqueous solution. Various organic halides
Phosphoric Acid Catalyzed Desymmetrization of Bicyclic Bislactones Bearing an All-Carbon Stereogenic Center: Total Syntheses of (−)-Rhazinilam and (−)-Leucomidine B
the presence of a catalytic amount of an imidodiphosphoric acid, enantioselective desymmetrization of bicyclicbislactones by reaction with alcohols took place smoothly to afford enantiomerically enriched monoacids having an all‐carbon stereogeniccenter. Concise catalytic enantioselective syntheses of both (−)‐rhazinilam and (−)‐leucomidine B were subsequently developed using (S)‐methyl 4‐ethyl‐4‐formylpimelate
The Stannum–Ene Reactions of Benzyne and Cyclohexyne with Superb Chemoselectivity for Cyclohexyne
作者:Lianggui Li、Chunhui Shan、Jiarong Shi、Wensheng Li、Yu Lan、Yang Li
DOI:10.1002/anie.202117351
日期:2022.4.19
The stannum–ene reactions of both benzyne and cyclohexyne were realized, which is particularly suitable for cyclohexyne with a broad substrate scope and excellent chemoselectivity.
Novel 4-(2-furoyl) aminopiperidines, intermediates in synthesizing the same, process for producing the same and medicinal use of the same
申请人:Fukutomi Ryuuta
公开号:US20050085508A1
公开(公告)日:2005-04-21
There are provided novel 4-(2-furoyl)aminopiperidines represented by the general formula (I), their synthetic intermediates, processes for their preparation and medicaments containing them.
In the above formula, X is CH or N, and Y is a group of the following general formula (II), formula (II-a) or formula (III):
wherein a, b and c are each an integer of 0-6;
Z is CH
2
or NH; W is O or S;
T is O or N—R
15
wherein R
15
is H, a C1-C6 alkyl group, a benzyl group or a phenethyl group; and
R
1
is H, a C1-C6 alkoxycarbonyl group, a benzyloxycarbonyl group, or the like. The 4-(2-furoyl)aminopiperidine derivatives according to this invention possess opioid μ antagonistic activity and are useful for the treatment or prevention of side effects which are caused by μ receptors agonist and which are selected from constipation, nausea/emesis or itch, or for the treatment or prevention of idiopathic constipation, postoperative ileus, paralytic ileus, irritable bowel syndrome or chronic pruritus.