photoreactions of α,β-unsaturatedγ,δ-epoxynitriles 1, 2, 13 and 16 with triethylamine give rise to novel 1 ∶ 1 α-adducts (e.g., 5) efficiently. After treatment with silica gel, the adducts undergo retro-Michael reaction leading to the corresponding α-alkylidenenitrile derivatives (e.g., 3). The epoxy nitrile 1 also reacts with various tertiary amines to afford α-adducts. The reaction of 1 and the silylamine
Photoreactions of α,β-unsaturated γ,δ-epoxy nitriles with amines. The novel photoadditions of tertiary amines to the α-position of the nitriles
作者:Keitaro Ishii、Masashi Kotera、Masanori Sakamoto
DOI:10.1039/c39940002465
日期:——
Direct irradiation of α,β-unsaturatedγ,δ-epoxynitriles (e.g.1) and tertiary amines gives rise to a novel 1:1 α-addition and subsequent retro-Michael reaction leading to α-alkylidenenitriles (e.g.2).
PHOTOCHEMISTRY OF AN α,β-UNSATURATED γ,δ-EPOXY NITRILE
作者:Keitaro Ishii、Masanori Sakamoto
DOI:10.1246/cl.1985.1107
日期:1985.8.5
On 1π, π*-excitation (λ=254 nm, pentane), α,β-unsaturatedγ,δ-epoxynitrile showed selective product formation via carbonyl ylide and carbene intermediates; (E/Z)-isomerization and C(γ),O-cleavage of the oxirane, which are triplet processes, did not occur.