Furan-fused 3-sulfolene as a novel building block: intermolecular Diels–Alder reactions of 4H,6H-thieno[3,4-c]furan 5,5-dioxide
作者:Takayoshi Suzuki、Kan Kubomura、Hiroaki Takayama
DOI:10.1039/a604600b
日期:——
A furan-fused 3-sulfolene
4H,6H-thieno[3,4-c]furan 5,5-dioxide 1, can be
used as a bis-diene, reacting sequentially with a variety of dienophiles to
construct four types of skeleton, depending on the dienophile and the
reaction conditions. The 3-sulfolene moiety of the furansulfolene not only
functions as the s-cis-diene part in DielsâAlder reactions,
but also extends the range of the DielsâAlder reactions of the furan
moiety with various dienophiles through its desulfonylation to form the
s-cis-diene.
呋喃融合的 3-砜基 4H,6H-噻吩并[3,4-c]呋喃 5,5-二氧化物 1 可用作双二烯,依次与各种二烯烃发生反应,根据二烯烃和反应条件的不同,构建出四种类型的骨架。呋喃磺烯的 3-亚磺酰基不仅在 DielsâAlder 反应中充当 s-cis-diene 部分,而且还能通过脱硫形成 s-cis-diene 来扩展呋喃分子与各种二烯烃的 DielsâAlder 反应范围。