Reactions of alkylidenephosphoranes with symmetrically substituted p-quinones
摘要:
The reaction of p-quinone 1 with ylides 2a and 2b afforded the corresponding phosphonium salts 8a,b, p-quinone-dimethanides 4a,b(Z) and 5a,b(E); substituted phenols 7a,b(Z and E) and coumarin-derivative II (only with 2a). The reaction of 1 with ylide 2c gave, besides 4c, 5c and 8c, hydroquinone[1]cyclobutene 16 and the Diels-Alder product 17. Reactions of 1 with 2d and 3 (salts) in the presence of sodium alkoxide yielded through preferred attack on the nitrile function, azo-22 and bisimino-24 compounds, respectively. (C) 1997 Published by Elsevier Science Ltd.
Reactions of alkylidenephosphoranes with symmetrically substituted p-quinones
摘要:
The reaction of p-quinone 1 with ylides 2a and 2b afforded the corresponding phosphonium salts 8a,b, p-quinone-dimethanides 4a,b(Z) and 5a,b(E); substituted phenols 7a,b(Z and E) and coumarin-derivative II (only with 2a). The reaction of 1 with ylide 2c gave, besides 4c, 5c and 8c, hydroquinone[1]cyclobutene 16 and the Diels-Alder product 17. Reactions of 1 with 2d and 3 (salts) in the presence of sodium alkoxide yielded through preferred attack on the nitrile function, azo-22 and bisimino-24 compounds, respectively. (C) 1997 Published by Elsevier Science Ltd.
Reactions of alkylidenephosphoranes with symmetrically substituted p-quinones
作者:Wafaa M. Abdou、Monier A.E. Salem、Ashraf A. Sediek
DOI:10.1016/s0040-4020(97)00905-8
日期:1997.10
The reaction of p-quinone 1 with ylides 2a and 2b afforded the corresponding phosphonium salts 8a,b, p-quinone-dimethanides 4a,b(Z) and 5a,b(E); substituted phenols 7a,b(Z and E) and coumarin-derivative II (only with 2a). The reaction of 1 with ylide 2c gave, besides 4c, 5c and 8c, hydroquinone[1]cyclobutene 16 and the Diels-Alder product 17. Reactions of 1 with 2d and 3 (salts) in the presence of sodium alkoxide yielded through preferred attack on the nitrile function, azo-22 and bisimino-24 compounds, respectively. (C) 1997 Published by Elsevier Science Ltd.