Manganese(III)-based oxidation of 1,2-disubstituted pyrazolidine-3,5-diones in the presence of alkenes
作者:Md.Taifur Rahman、Hiroshi Nishino
DOI:10.1016/j.tet.2003.08.054
日期:2003.10
The manganese(III)-catalyzed aerobic oxidation of 1,2-disubstituted pyrazolidine-3,5-diones 1 in the presence of alkenes 2 gave the corresponding pyrazolidinediones 3 which were doubly hydroperoxyalkylated at the 4-position in high yields. On the other hand, pyrazolidinediones 1 were oxidized with manganese(III) acetate in the presence of alkenes 2 at elevated temperature to produce the 4,4-bis(al
Synthesis of 4,4-bis(2-hydroperoxyalkyl)pyrazolidine-3,5-diones using manganese(III)-catalyzed autoxidation
作者:Md.Taifur Rahman、Hiroshi Nishino、Chang-Yi Qian
DOI:10.1016/s0040-4039(03)01274-7
日期:2003.7
The autoxidation of a mixture of 1,2-disubstituted pyrazolidine-3,5-diones 1 and alkenes 2 in the presence of a catalytic amount of manganese(III) acetate dihydrate in air gave 4,4-bis(2-hydroperoxyalkyl)pyrazolidine-3,5-diones 3 in 75-96% yields. The structure of the bis(2-hydroperoxyethyl)pyrazolidine-3,5-dione 3 (R-1=R-2=Ph, R-3=R-4=4-FC6H4) has been corroborated by an X-ray single crystallographic analysis. On the other hand, the manganese(III) acetate oxidation of a mixture of 1 (R-1=R-2=Ph) and 2 (R-3=R-4=Ph) at elevated temperature gave 4,4-bis(2,2-diphenylethenyl)-1,2-diphenylpyrazolidine-3,5-dione (4) in good yield. (C) 2003 Elsevier Science Ltd. All rights reserved.