Highly Selective β-Hydride Elimination in Pd-Catalyzed Decarboxylative Heck-Type Reaction
摘要:
A variety of beta-aryl ketones and aldehydes were facilely synthesized via a Pd(II)/Ag2CO3-mediated decarboxylative Heck type reaction between readily available benzoic acid derivatives and allylic alcohols under mild conditions. The control experiments indicated that this transformation may proceed via a hydrogen migration process.
Friedel–Crafts Reaction of Activated Benzene Rings with Captodative and Electron‐Deficient Alkenes. A One‐Step Synthesis of the Natural Product Methyl 3‐(2,4,5‐Trimethoxyphenyl)propionate
作者:Raúl Aguilar、Adriana Benavides、Joaquín Tamariz
DOI:10.1081/scc-200026193
日期:2004.1
Electrophilic aromatic substitution of activated benzenes with the captodative olefin 1-acetylvinyl-1-p-nitrobenzoate (9), and with the electron-deficient alkenes methyl acrylate (8a), methylvinylketone (8b), and acrolein (8c) were evaluated under Lewis acid catalysis. Olefin 9 proved to be much more reactive than alkenes 8a-8c. We also describe a one-step synthesis of the antifungal and larvicidal natural product methyl 3-(2,4,5-trimethoxyphenyl)propionate (6), by reaction of 1,2,4-trimethoxybenzene with 8a under microwave irradiation.
FORMATION OF NEOLIGNAN BY DDQ MEDIATED DIMERISATION OF DIHYDROASARONE
申请人:Council of Scientific and Industrial Research;an Indian Reg. body incorporated under Reg. of Societies Act (Act XXI of 1860)
公开号:EP1487770A1
公开(公告)日:2004-12-22
[EN] FORMATION OF NEOLIGNAN BY DDQ MEDIATED DIMERISATION OF DIHYDROASARONE<br/>[FR] FORMATION DE NEOLIGNAN PAR DIMERISATION DE DIHYDROASARONE MEDIEE PAR DDQ
申请人:COUNCIL SCIENT IND RES
公开号:WO2003080551A1
公开(公告)日:2003-10-02
The present invention relates to a novel neolignan (NEOLASA-I) 3-ethyl-2-methyl-3-(2', 4', 5'-trimethoxy-phenyl-1-(2',4',5'-trimethoxy) phenyl-1-(2',4',5'-trimethoxy)phenyl-1-propene and a process for the preparation of high purity, higher yield neolignan, a-asarone, 2,4,5-trimethoxy-phenyl propionone from b-asaroneor b-asarone rich Acorus calamus oil containing a and g - asarone by hydrogenating and dimerizing by treatment with DDQ in presence of an organic acid.
Potent and Selective Non-Peptidic Inhibitors of Endothelin-Converting Enzyme-1 with Sustained Duration of Action
作者:Stéphane De Lombaert、Louis Blanchard、Lisa B. Stamford、Jenny Tan、Eli M. Wallace、Yoshitaka Satoh、John Fitt、Denton Hoyer、David Simonsbergen、John Moliterni、Nicholas Marcopoulos、Paula Savage、Mary Chou、Angelo J. Trapani、Arco Y. Jeng
DOI:10.1021/jm990507o
日期:2000.2.1
Functionally, 27and 29 were the two most efficacious compounds from this study, producing sustained inhibition of ECE-1 activity in rats, as measured by their ability to block the hypertensive effects induced by big ET-1. This profile was similar to that of a potent ET(A)/ET(B) dualreceptorantagonist, SB 209670. Due to their favorable in vitro and in vivo profiles, 27 (CGS 34043) and 29 (CGS 35066) constitute
A variety of beta-aryl ketones and aldehydes were facilely synthesized via a Pd(II)/Ag2CO3-mediated decarboxylative Heck type reaction between readily available benzoic acid derivatives and allylic alcohols under mild conditions. The control experiments indicated that this transformation may proceed via a hydrogen migration process.