Synthesis of indoles via alkylidenation of acyl hydrazides
作者:Kevin Hisler、Aurélien G.J. Commeureuc、Sheng-ze Zhou、John A. Murphy
DOI:10.1016/j.tetlet.2009.02.060
日期:2009.7
synthesised via alkylidenation of acyl phenylhydrazides using phosphoranes and the Petasis reagent, followed by in situ thermal rearrangement of the product enehydrazines. The Petasis reagent provides an essentially neutral equivalent of the [acid-catalysed] Fischer indole synthesis, but with acyl phenylhydrazides as starting substrates. Alkylidene triphenylphosphoranes convert aroyl phenylhydrazides to indoles
An indole core bearing a functional group on the C2 position is often found as a key structure in biologically active natural products and pharmaceuticals. Here, we report direct C2‐functionalization of indoles triggered by the formation of an iminium species generated from indole and a sulfonium reagent. The reaction proceeded under very mild conditions to give the corresponding C2‐substituted indole
NOVEL REVAMIPIDE PRODRUGS, PREPARATION METHOD AND USE THEREOF
申请人:SAMJIN PHARMACEUTICAL CO., LTD.
公开号:US20150141409A1
公开(公告)日:2015-05-21
Disclosed are a novel rebamipide prodrug, a method for preparing the same, and use thereof. Also, a pharmaceutical composition comprising the novel rebamipide prodrug as an active ingredient is provided. The rebamipide prodrug is increased 25-fold in absorption rate compared to rebamipide itself, and can be applied to the prophylaxis or therapy of gastric ulcer, acute gastritis, chronic gastritis, xerophthalmia, cancer, osteoarthritis, rheumatoid arthritis, or obesity.
A method of combating and controlling insects, acarines, nematodes or molluscs which comprises applying to a pest, to a locus of a pest, or to a plant susceptible to attack by a pest an insecticidally, acaricidally, nematicidally or molluscicidally effective amount of a compound of formula (I), wherein R1 is R4, YR5 or ZR6; Y is CO or C=S; Z is S, S(O), SO2 or PO2; and A is an optionally substituted phenyl or an optionally substituted heteroaromatic ring, wherein R1 to R6 are defined organic groups; new compounds are also provided.
The Selective Cross-Coupling of Secondary Alkyl Zinc Reagents to Five-Membered-Ring Heterocycles Using Pd-PEPPSI-IHept<sup>Cl</sup>
作者:Bruce Atwater、Nalin Chandrasoma、David Mitchell、Michael J. Rodriguez、Matthew Pompeo、Robert D. J. Froese、Michael G. Organ
DOI:10.1002/anie.201503941
日期:2015.8.10
leads to β‐hydride elimination. Whereas catalysts have been reported that provide decent selectivity for the expected (non‐rearranged) cross‐coupled product with aryl or heteroaryl oxidative‐addition partners, none have shown reliable selectivity with five‐membered‐ring heterocycles. In this report, a new, rationally designed catalyst, Pd‐PEPPSI‐IHeptCl, is demonstrated to be effective in selective