Photocleavage coupling reactions between cyclohexa-2,4-dienone sulfone derivatives and amines by visible light irradiation
摘要:
A stable sulfone derivative of 2,4,6-trimethylcyclohexa-2,4-diene-1-one (7) undergoes facile ring cleavage under visible light to produce a ketene intermediate, which could be efficiently captured by amines to give amides even in the presence of competing nucleophiles such as water and ethanol. (C) 1999 Elsevier Science Ltd. All rights reserved.
Photocleavage coupling reactions between cyclohexa-2,4-dienone sulfone derivatives and amines by visible light irradiation
摘要:
A stable sulfone derivative of 2,4,6-trimethylcyclohexa-2,4-diene-1-one (7) undergoes facile ring cleavage under visible light to produce a ketene intermediate, which could be efficiently captured by amines to give amides even in the presence of competing nucleophiles such as water and ethanol. (C) 1999 Elsevier Science Ltd. All rights reserved.
t-Butyl bromide-activated dimethyl sulphoxide reacts with phenols to give either methylthiomethylation or bromination products. Several equilibria are shown to be simultaneously present in the system; however, by appropriate choice of several parameters (basicity, temperature, and reactant ratio) it is possible to drive the reaction selectively in one direction. A general discussion on the mechanism
A convenient synthesis of a variety of 2, 4-cyclohexadien-1-ones 3-7 is described. Reaction of various phenols 2 having appropriate substituents with an excess of S, S-dimethylsuccinmidosulfonium chloride (Corey-Kim reagent, 1)in the presence of triethylamine proceeded with regioselective methylthiomethylation to give methylthiomethyl, bis(methylthiomethyl), or tris(methylthiomethyl)-2, 4-cyclohexadien-1-ones 3-7 in satisfactory yields.
Sulfoxide-carbodiimide reactions. V. Reactions of 2,6-disubstituted phenols
作者:Michael G. Burdon、John G. Moffatt
DOI:10.1021/ja00994a028
日期:1967.8
Photochemically induced symmetrical coupling reactions between cyclohexa-2,4-dienones and α,ω-diamines. A new approach to the selective labelling of peptides and proteins
作者:Derek H.R. Barton、Sung Kee Chung、Young Mee Kim、Tae Woo Kwon
DOI:10.1016/s0960-894x(97)00096-6
日期:1997.3
2,4,6-Trimethylcyclohexa-2,4-dien-1-one derivatives undergo ring cleavage to furnish symmetrical amides on irradiation with visible light in the presence of various alpha,omega-diamines. Five different symmetrical amides containing a substituted diene moiety were synthesized in 65-85% yield. (C) 1997 Elsevier Science Ltd.
Novel synthesis of cyclohexa-2,4-dien-1-ones. Its use in a partial synthesis of the chromophore portion of phomenoic acid