Substituent effects on the cyclization mode of 7-sulfonyl-3-hepten-1,5-diynes and 11-sulfonylundeca-3,7-dien-1,5,9-triynes
摘要:
In probing of cycloaromatization of 7-phenylsulfonyl-3-hepten-1,5-diyne systems to generate biradical intermediates under an alkaline condition suggested that the aryl moiety on C3-C4 also plays an important role to switch the Myers cyclization to Schmittel cyclization in the allen-enyne system, although the aryl group on the alkyne terminus does not work in the proceeding of the cycloaromatization. For example, treatment of 1-phenyl-7-phenylsulfonyl-3-hepten-1,5-diyne (8) with triethylamine in the presence of 1 4-cyclohexadiene in benzene offered biphenyl 13 in 51% yield. Under the same reaction conditions, cyclization of 1-(2-phenylethynyl)-2-(3-phenylsulfonyl-1-propynyl) benzene (28) gave naphthalene 34 in 42% yield along with indene 35 in 32% yield. Moreover, the substituent effect also occurred in the cyclization of 11-phenylsulfonylundeca-3,7-diene-1,5,9-triyne (38). which provided indene 39 in 50% yield as the major product. (C) 2004 Elsevier Ltd. All rights reserved.
A direct route to conjugated enediynes from dipropargylic sulfones by a modified one-flask Ramberg–Bäcklund reaction
作者:Xiaoping Cao、Yuying Yang、Xiaolong Wang
DOI:10.1039/b207296n
日期:——
The reaction of dipropargylic sulfones with dibromodifluoromethane in the presence of alumina-supported KOH in dichloromethane solution results in facile rearrangement affording the corresponding conjugated linear and cyclic enediynes in good yields. This result shows that the direct transformation of α- and α′-hydrogen bearing sulfones assembles enediyne units without resorting to the prior preparation
Synthesis of polyphenylene derivatives by thermolysis of enediynes and dialkynylaromatic monomers
作者:Jens A John、James M Tour
DOI:10.1016/s0040-4020(97)00977-0
日期:1997.11
Described are the syntheses of substituted enediynes and dialkynylaromatics using Pd- or cross coupling procedures. The products were then thermalized to afford the corresponding poly(p-phenylene)s, poly(1,4-naphthalene)s, poly(benzo[c]thiophene)s, and poly(dibenzothiophene)s. Fifteen examples are provided that show the scope of the polymerization process based upon substituent patterns and cyclization
Synthesis of Polyphenylenes and Polynaphthalenes by Thermolysis of Enediynes and Dialkynylbenzenes
作者:Jens A. John、James M. Tour
DOI:10.1021/ja00090a066
日期:1994.6
Abstract : Described are the syntheses of substituted enediynes and dialkynylbenzenes using Pd- or Pd/Cu-catalyzed cross coupling procedures. The products were then thermalized, generally in benzene, to afford the corresponding poly(p-phenylene)s and poly(1,4-naphthalene)s. Thirteen examples are provided that show the scope of the polymerization process based upon substituent patterns and cyclization