Enantioselective cyanoformylation of aldehydes organocatalyzed by recyclable cinchonidine ammonium salts
作者:Rafael Chinchilla、Carmen Nájera、Francisco J. Ortega、Silvia Tarí
DOI:10.1016/j.tetasy.2009.08.007
日期:2009.10
and α,β-unsaturated aldehydes give lower enantioselectivities (up to 60%) in high yields. The observed sense of the enantioselection was always the same, and the organocatalyst was almost quantitatively recovered by ether-promoted precipitation without any loss of activity. The use of resin-supported cinchonidine-derived ammoniumsalts as an organocatalyst in this transformation was also explored.
Facile construction of diverse polyheterocyclic scaffolds <i>via</i> gold-catalysed dearomative spirocyclization/1,6-addition cascade
作者:Yi He、Danjun Wu、Zhenghua Li、Koen Robeyns、Luc Van Meervelt、Erik V. Van der Eycken
DOI:10.1039/c9ob01299k
日期:——
A gold-catalysed post-Ugi chemo- and diastereoselective cascade dearomative spirocyclization/1,6-addition sequence is disclosed for the synthesis of diverse fused polyheterocyclic scaffolds bearing indole, pyrrole, benzothiophene, furan or electron-rich arene moieties from easily available building blocks. The effectiveness and efficiency of this diversity-orientedapproach has been proved in the rapid
Photoredox-Catalyzed Multicomponent Petasis Reaction with Alkyltrifluoroborates
作者:Jun Yi、Shorouk O. Badir、Rauful Alam、Gary A. Molander
DOI:10.1021/acs.orglett.9b01747
日期:2019.6.21
A redox-neutral alkyl Petasisreaction has been developed that proceeds via photoredox catalysis. A diverse set of primary, secondary, and tertiary alkyltrifluoroborates participate effectively in this reaction through a single-electron transfer mechanism, in contrast to the traditional two-electron Petasisreaction, which accommodates only unsaturated boronic acids. This protocol is ideal to diversify
A series of thiazolo[3,2-b][1,2,4]triazole-6(5H)-ones were synthesized and evaluated for their analgesic and anti-inflammatory activities. The structures of these compounds were supported by FT-IR, 1HNMR, and Mass spectra. All of the final compounds showed potent analgesic activity and the best compound 9d was 2.4 times more potent than mefenamic acid as the reference drug. In addition, most of them
合成了一系列噻唑并[3,2- b ] [1,2,4]三唑-6(5 H)-,并评估了它们的镇痛和抗炎活性。这些化合物的结构得到FT-IR,1 HNMR和质谱的支持。所有最终化合物均显示出有效的镇痛活性,最佳化合物9d的效力是作为参比药物的甲芬那酸的2.4倍。另外,它们中的大多数显示出与甲芬那酸和消炎痛相比可比或更好的抗炎活性。此外,化合物9d,9e,9g,9h,9i,9k,9n和9o没有表现出任何明显的致溃疡活性。
1,4-disubstituted piperidine derivatives and their use as 11,betahsd1 inhibitors
申请人:Barton John Peter
公开号:US20050256159A1
公开(公告)日:2005-11-17
A method for inhibiting 11βHSD1 by administering a compound of formula (I) is described, wherein A, X, Y, R
1
, R
12
, n, q, and m are as described in the specification. Novel compounds and methods employing them are also described and claimed.