Ionic Liquid as Catalyst and Reaction Medium: A Simple and Efficient Procedure for Paal–Knorr Furan Synthesis
作者:Gangqiang Wang、Zhi Guan、Rongchang Tang、Yanhong He
DOI:10.1080/00397910902978049
日期:2010.1.14
The ionicliquid 1-butyl-3-methyl-imidazolium hydrogen sulfate, [bmim]HSO4, efficiently catalyzes Paal–Knorr furan synthesis without any organic solvent. A wide range of aliphatic and aromatic 1,4-diketones easily undergo condensations to form furan derivatives, providing a general and convenient procedure. The Paal–Knorr reaction of ester-substituted 1,4-diketones is first reported. The ionic liquid
Copper-Catalyzed Coupling of 2-Siloxy-1-alkenes and Diazocarbonyl Compounds: Approach to Multisubstituted Furans, Pyrroles, and Thiophenes
作者:Wei Wen Tan、Naohiko Yoshikai
DOI:10.1021/acs.joc.6b00904
日期:2016.7.1
We report herein copper(II)-catalyzed cyclization reactions of silylenolethersderivedfrom methyl ketones with α-diazo-β-ketoesters or α-diazoketones to afford 2-siloxy-2,3-dihydrofuran derivatives or 2,3,5-trisubstituted furans, respectively, under mild conditions. The former cyclization products serve as versatile 1,4-diketone surrogates, allowing facile preparation of 2,3,5-trisubstituted furans
[EN] NON-NUCLEOSIDE REVERSE TRANSCRIPTASE INHIBITORS<br/>[FR] INHIBITEURS NON NUCLEOSIDIQUE DE TRANSCRIPTASE INVERSE
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2003097644A2
公开(公告)日:2003-11-27
Compounds represented by formula (I), wherein R2 is selected from the group consisting of H, (C1-4)alkyl, halo, haloalkyl, OH, (C1-6)alkoxy, NH(C1-4alkyl) or N(C1-4alkyl)2; R4 is H or Me; R5 is H or Me; R11 is H, (C1-4)alkyl, (C3-4)cycloalkyl and (C1-4)alkyl-(C3-4)cycloalkyl; A is a connecting chain of (C1-3)alkyl; B is O or S; n is 0 or 1; wherein when n is 0: Ring C is 6- or 10-membered aryl or 5- or 6-membered heterocycle having from 1 to 4 heteroatoms selected from the group consisting of O, N, and S, said aryl and said heterocycle being optionally substituted; and E is CONR12R13 ; CONHNR14R15; NR16COR17; NR18SO2(C1-6)alkyl; SO2NR19R20; or SO2R21; or when n is 1: Ring C is as defined above and E is a single bond or a connecting group; and Ring D is 6- or 10-membered aryl or 5- or 6-membered heterocycle having from 1 to 4 heteroatoms selected from the group consisting of O, N, and S, said aryl and said heterocycle being optionally substituted with from 1 to 5 substituents; or a salt or a prodrug thereof are provided as inhibitors of HIV reverse transcriptase.