154667-00-2Relevant academic research and scientific papers
Diels-Alder reaction of pyran-2(H)-ones: Part VI - Preparation and investigation of the Diels-Alder reaction of 4,6-disubstituted thiopyran-2(H)-ones with 1,4-naphthoquinone and N-phenylmaleimide
Pai, Ruchira R.,Bendre, Deven S.,Samant, Shriniwas D.
, p. 191 - 195 (2007/10/03)
4,6-Disubstituted pyran-2(H)-ones 1 when treated with P2S5 the corresponding pyran-2(H)-thiones 2 are obtained. 2 on boiling in aq. methanol in the presence of Na2CO3 give the corresponding thiopyran-2(H) -ones 3. The mechanism for this reaction has been proposed, which is supported by the AM1 calculation results and the spectral data. The Diels-Alder reactions of 2 and 3 with N-phenylmaleimide and 1,4-naphthoquinone have been studied.
Comparative study of the Diels-Alder reactions of 4,6-bis(4-methoxyphenyl)-2H-pyran-2-one and 4-(4-methoxyphenyl)-6-methyl-2H-pyran-2-one and their thiones with some symmetrical dienophiles
Karmarkar, K. S.,Samant, S. D.
, p. 1113 - 1118 (2007/10/02)
4,6-Bis(4-methoxyphenyl)-2H-pyran-2-one (2) and 4-(4-methoxyphenyl)-6-methyl-2H-pyran-2-one (3) react with 1,4-naphthoquinone to form the corresponding 1,3-disubstituted anthraquinones (8,9).The reaction has been carried out in different solvents as well
