Intramolecular Cyclization Reactions of 5-Halo- and 5-Nitro-Substituted Furans
摘要:
[GRAPHICS]Intramolecular cyclization reactions of 5-halo- and 5-nitro-substituted furanylamides were examined. The 2-alkoxy-5-bromofuran derivative 2 produced the rearranged dihydroquinone 6 (36%), a product from the rearrangement of the intermediate oxabicycle 3. The 5-halo substituted furoyl amide 18 was converted to the polyfunctional oxabicycle 20 in 82% yield and at a much faster rate than the unsubstituted furanyl system 17. The 5-nitro-substituted furfuryl amide 33b underwent an unusual isomerization-cyclization reaction under microwave conditions to provide 1,4-dihydro-2H-benzo[4,5]furo[2,3-c]pyridin-3-one 34.
Intramolecular Cyclization Reactions of 5-Halo- and 5-Nitro-Substituted Furans
摘要:
[GRAPHICS]Intramolecular cyclization reactions of 5-halo- and 5-nitro-substituted furanylamides were examined. The 2-alkoxy-5-bromofuran derivative 2 produced the rearranged dihydroquinone 6 (36%), a product from the rearrangement of the intermediate oxabicycle 3. The 5-halo substituted furoyl amide 18 was converted to the polyfunctional oxabicycle 20 in 82% yield and at a much faster rate than the unsubstituted furanyl system 17. The 5-nitro-substituted furfuryl amide 33b underwent an unusual isomerization-cyclization reaction under microwave conditions to provide 1,4-dihydro-2H-benzo[4,5]furo[2,3-c]pyridin-3-one 34.
High-Load, Soluble Oligomeric Carbodiimide: Synthesis and Application in Coupling Reactions
作者:Mianji Zhang、Punitha Vedantham、Daniel L. Flynn、Paul R. Hanson
DOI:10.1021/jo048870c
日期:2004.11.1
A facile preparation of a high-load, soluble oligomeric alkyl cyclohexylcarbodiimide (OACC) reagent via ROM polymerization from commercially available starting materials is described. This reagent is exploited as a coupling reagent for esterification, amidation, and dehydration of carboxylicacids (aliphatic and aromatic) with an assortment of alcohols (aliphatic primary, secondary, and benzylic),
[EN] HETEROCYCLIC COMPOUNDS USEFUL AS MK2 INHIBITORS<br/>[FR] COMPOSÉS HÉTÉROCYCLIQUES UTILES COMME INHIBITEURS DE MK2
申请人:NOVARTIS AG
公开号:WO2009010488A1
公开(公告)日:2009-01-22
The present invention describes tetracyclic compounds of formula (IA) or (IB), wherein the symbols R, X, A, Y, R2, R3 and D are as defined in the specification, their use in the treatment of certain diseases, e.g. depending on MK-2 or TNF activity, and ways of manufacturing them.
Halo Substituent Effects on Intramolecular Cycloadditions Involving Furanyl Amides
作者:Albert Padwa、Kenneth R. Crawford、Christopher S. Straub、Susan N. Pieniazek、K. N. Houk
DOI:10.1021/jo0602322
日期:2006.7.1
Intramolecular Diels−Alder reactions involving a series of N-alkenyl-substituted furanyl amides were investigated. Stable functionalized oxanorbornenes were formed in high yield upon heating at 80−110 °C. The cycloaddition reactions include several bromo-substituted furanyl amides, and these systems were found to proceed at a much faster rate and in higher yield than without substitution. This effect
The present invention describes tetracyclic compounds of formula (IA) or (IB),
wherein the symbols R, X, A, Y, R2, R3 and D are as defined in the specification, their use in the treatment of certain diseases, e.g. depending on MK-2 or TNF activity, and ways of manufacturing them.
Rai, Usha Kumari; Mishra, S K; Shanker, Brija, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1993, vol. 32, # 6, p. 618 - 623
作者:Rai, Usha Kumari、Mishra, S K、Shanker, Brija、Singh, Sujan、Rao, R Balaji