[EN] METHODS FOR PHOSPHINE OXIDE REDUCTION IN CATALYTIC WITTIG REACTIONS<br/>[FR] PROCÉDÉS POUR LA RÉDUCTION D'UN OXYDE DE PHOSPHINE DANS DES RÉACTIONS DE WITTIG CATALYTIQUES
申请人:UNIV DUBLIN CITY
公开号:WO2014140353A1
公开(公告)日:2014-09-18
A method for increasing the rate of phosphine oxide reduction, preferably during a Wittig reaction comprising use of an acid additive is provided. A room temperature catalytic Wittig reaction (CWR) the rate of reduction of the phosphine oxide is increased due to the addition of the acid additive is described. Furthermore, the extension of the CWR to semi-stabilized and non-stabilized ylides has been accomplished by utilization of a masked base and/or ylide-tuning.
Heterocycles. Part I. A new route to the synthesis of substituted 2-aminopyrimidines
作者:N. R. El-Rayyes
DOI:10.1002/jhet.5570190240
日期:1982.3
Heterocyclic aldehydes (A) reacted with alkyl aryl ketones (B) to give the corresponding 1,3-diaryl-2-propen-1-ones (Ia-1). Condensation of these chalcones with guanidine produced the corresponding 2-amino-4,6-diarylpyrimidines (IIa-1). The structure of all products was substantiated by chemical and spectroscopic methods.
Furan oxidation by Mn(<scp>iii</scp>)/Co(<scp>ii</scp>) catalysts – application to benzofuran synthesis
作者:Tingshu Wang、Miao Zhang、Yifan Zheng、Junmo Seong、Myoung Soo Lah、Sangho Koo
DOI:10.1039/d1ra05305a
日期:——
containing a β-ketoester group at 2-position undergo oxidative ring-opening by Mn(III)/Co(II) catalysts under an O2 atmosphere to produce 1,4-dicarbonyl moieties through an endoperoxide intermediate, which consecutively cyclized with the β-ketoester unit to afford 4-hydroxy-2-cyclohexen-1-ones. This oxidation/cyclization products were efficiently transformed into versatile benzofuran derivatives after consecutive
2位含有β-酮酯基的呋喃在O 2气氛下,通过Mn( III )/Co( II )催化剂进行氧化开环,通过内过氧化物中间体生成1,4-二羰基部分,并依次与β-酮酯单元得到4-羟基-2-环己烯-1-酮。经过连续芳构化和Paal-Knorr反应后,该氧化/环化产物被有效地转化为多功能苯并呋喃衍生物。
NaOH-Promoted Chemoselective Cascade Cyclization of Cyclopropyl Esters with Unsaturated Imines: Access to Bioactive Cyclopenta[c]pyridine Derivatives
作者:Dingwu Pan、Chengli Mou、Ningning Zan、Ya Lv、Bao-An Song、Yonggui Robin Chi、Zhichao Jin
DOI:10.1021/acs.orglett.9b02088
日期:2019.9.6
A chemoselective cascade cycloaddition reaction is developed for green and efficient access to cyclopenta[c]pyridine derivatives. Simple and inexpensive NaOH is used as the sole catalyst for this process. The δ-carbon of cyclopropyl ester is activated as a nucleophilic carbon to initiate highly chemoselective cascade reactions. Cyclopenta[c]pyridines bearing various substituents are afforded in excellent
Synthesis of 2-(thienyl-2-yl or -3-yl)-4-furyl-6-aryl pyridine derivatives and evaluation of their topoisomerase I and II inhibitory activity, cytotoxicity, and structure–activity relationship
作者:Pritam Thapa、Radha Karki、Hoyoung Choi、Jae Hun Choi、Minho Yun、Byeong-Seon Jeong、Mi-Ja Jung、Jung Min Nam、Younghwa Na、Won-Jea Cho、Youngjoo Kwon、Eung-Seok Lee
DOI:10.1016/j.bmc.2010.01.065
日期:2010.3
A series of 2-(thienyl-2-yl or -3-yl)-4-furyl-6-aryl pyridine derivatives were designed, synthesized, and evaluated for their topoisomerase I and II inhibition and cytotoxic activity against several human cancer cell lines. Compounds 10–19 showed moderate topoisomerase I and II inhibitory activity and 20–29 showed significant topoisomerase II inhibitory activity. Structure–activity relationship study