194937-41-2Relevant academic research and scientific papers
Generation of 1,3-chalcogenaza-1,3-butadienes by thermal cycloreversion of 2,4,6-trisubstituted 6H-1,3,5-oxachalcogenazines
Shimada, Kazuaki,Aikawa, Kei,Fujita, Takuji,Sato, Masanobu,Goto, Kurara,Aoyagi, Shigenobu,Takikawa, Yuji,Kabuto, Chizuko
, p. 511 - 525 (2001)
1,3-Thiaza- and 1,3-selenaza- 1,3-butadienes bearing several substituents at the C-2 and C-4 positions were generated through thermal cycloreversion of 6H-1,3,5-oxathiazines or 6H-1,3,5-oxaselenazines, respectively, and the heterodienes were efficiently trapped by using acetylenic dienophiles. When 6H-1,3,5-oxathiazines or 6H-1,3,5-oxaselenazines were heated in the presence of nucleophiles, such as alcohols or thiols, the corresponding 1,4-adducts of the heterodienes with the nucleophiles were obtained in good yields. On the other hand, heating of 6H-1,3,5-oxathiazines or 6H-1,3,5-oxaselenazines in the absence of trapping agents afforded several products which originated from the in situ generated 1,3-chalcogenaza-1,3-butadienes; also the heterodienes were not isolated or observed directly as the monomeric forms at all.
Generation of 1,3-selenaza-1,3-butadienes by thermal cycloreversion of 2,4,6-trisubstituted 6H-1,3,5-oxaselenazines
Shimada, Kazuaki,Aikawa, Kei,Fujita, Takuji,Aoyagi, Shigenobu,Takikawa, Yuji,Kabuto, Chizuko
, p. 701 - 702 (2007/10/03)
1,3-Selenaza-1,3-butadienes were generated by thermal cycloreversion of 6H-1,3,5-oxaselenazines, and were trapped with dienophiles or nucleophiles to give the corresponding [4+2] cycloadducts or 1,4-adducts, respectively.
