Brønsted Acid-Catalyzed Cycloisomerization of But-2-yne-1,4-diols with or without 1,3-Dicarbonyl Compounds to Tri- and Tetrasubstituted Furans
作者:Srinivasa Reddy Mothe、Sherman Jun Liang Lauw、Prasath Kothandaraman、Philip Wai Hong Chan
DOI:10.1021/jo301093f
日期:2012.8.17
efficiently from cycloisomerization of but-2-yne-1,4-diols with or without 1,3-dicarbonyl compounds is described. By taking advantage of the orthogonal modes of reactivity of the alcoholic substrate through slight modification of the reaction conditions, a divergence in product selectivity was observed. At roomtemperature, p-TsOH·H2O-mediated tandem alkylation/cycloisomerization of the propargylic
作者:Tuong Anh To、Chao Pei、Rene M. Koenigs、Thanh Vinh Nguyen
DOI:10.1002/anie.202117366
日期:2022.3.21
H-bonding network: Hexafluoroisopropanol (HFIP) can act as a hydrogen-bond donor to enhance the catalytic efficiency of simple Brønsted acid catalysts in carbonyl-olefin metathesis reactions by stabilization of all transition states and intermediates along the reaction pathway.
propargylation on corresponding keto-alcohols or by sodiumborohydride mediated reduction of 2-hydroxy-2-propargyl ketones. The furan synthesis proceeded through iodine mediated 5-exo-trig cyclization, dehydration and reductive deiodination. The method was applied to the synthesis of 2-methylfuran fused to phenanthrene, pyrene and acenaphthylene rings.
Ready Access to Densely Substituted Furans Using Tsuji–Wacker-Type Cyclization
作者:Dattatraya P. Masal、Rahul Choudhury、Aman Singh、D. Srinivasa Reddy
DOI:10.1021/acs.joc.1c02567
日期:2022.1.7
construction of highly substitutedfurans catalyzed by Pd(II) and Cu(II) chloride has been developed. The method provides easy access to di-, tri-, and tetrasubstituted furans from corresponding diols with relatively mild conditions in a unified strategy. The developed method has been successfully tested with more than 25 substrates, which resulted in furans of multiple substitution patterns with up to
UREIDE DERIVATIVE AND PHARMACEUTICAL APPLICATION THEREOF
申请人:Sugawara Yuji
公开号:US20100234395A1
公开(公告)日:2010-09-16
Discloses is a pharmaceutical agent comprising an ureide derivative represented by the formula: or a pharmaceutically acceptable salt thereof as an active ingredient. The ureide derivative or the pharmaceutically acceptable salt thereof is useful for the relief of a pain or the treatment or prevention of neurogenic pain.