Synthesis of 2,3‐disubstituted Benzofuran via HNTf
<sub>2</sub>
/TMSOTf Catalyzed Intermolecular Reaction of
<i>o‐</i>
alkenyl phenols and Aldehydes
作者:Jingyao Tan、Rui Wang、Li Xu、Wenli Wu、Meijia Deng、Wanhong Yuan、Li Li、Zhihua Lin
DOI:10.1002/adsc.202300123
日期:——
The syntheticmethods of 2,3-disubstituted benzofurans have been widely studied, however, the maneuvers of using o-alkenyl phenols as starting materials are less explored. Herein, we report a general and efficient strategy via HNTf2/TMSOTf catalyzed cascade reaction with readily available o-alkenyl phenols and aldehydes as starting materials, which provides 2,3-disubstituted benzofuran derivatives
Asymmetric Cascade Annulation Based on Enantioselective Oxa-Diels–Alder Cycloaddition of in Situ Generated Isochromenyliums by Cooperative Binary Catalysis of Pd(OAc)<sub>2</sub> and (<i>S</i>)-Trip
作者:Shu-Yan Yu、Hao Zhang、Yang Gao、Lei Mo、Shaozhong Wang、Zhu-Jun Yao
DOI:10.1021/ja405764p
日期:2013.7.31
An asymmetric cascade annulation between 2-hydroxystyrenes and 2-alkynylbenaldehyes or 1-(2-alkynylphenyl)ketones has been established with good to excellent enantioselectivities (up to >99.5% ee), on the basis of an enantioselective oxa-Diels-Alder cycloaddition of in situ generated metallo-isochromenylium intermediates, by cooperative binary catalysis of Pd(OAc)(2) and (S)-Trip. The developed methodology is workable for a broad spectrum of substrates and shows great efficiency in establishing dense multiple chiral centers including quaternary carbons of variable bridged ring systems. The mechanism study suggests that (S)-Trip plays multiple roles in assembling the reactants and controlling the stereoselectivity.
[EN] SPIRO[BENZOFURANCYCLOALKANE]CARBOXAMIDES AS 5HT3 ANTAGONISTS
申请人:RHONE-POULENC RORER INTERNATIONAL (HOLDINGS), INC.
公开号:WO1991016888A1
公开(公告)日:1991-11-14
(EN) This invention is directed toward certain spiro[benzofuran-2(3H),1'-cycloalkane]carboxamides and their use as 5HT3-antagonists having unique central nervous system, anti-emetic and gastric prokinetic activity void of any significant D2-receptor binding properties. This invention also discloses novel processes necessary for their preparation.(FR) On décrit certains spiro[benzofuranne-2(3H),1'-cycloalcane]carboxamides et leur utilisation en tant qu'antagonistes de 5HT3 agissant dans le système nerveux central et présentant une activité antivomitive et procinétique gastrique exceptionnelle dépourvue de toute propriété de liaison des récepteurs D2. On décrit également de nouveaux procédés de préparation desdites substances.