Ababwck The title compnds afforded under mlathly mild conditions the polycyclic systems 3% 4, and 5 thmugb altemative collwmitant cycloadditions; the mactivily ofthe wdazinc syxtem wascri~innucnccdbythepnsavxofmcthyl~atthc3and6~ti~.Thesllctond3r andthestenochemistryofswemestablishedbyx-ray-.
1.3.2.4.5-dioxadithiazin-2.2.4.4-tetraoxides - new reagents for [2+2] - and [2+4]-cycloadditions to olefins
✍ Scribed by V.K. Belskii; I.V. Bodrikov; A.A. Michurin; L.I. Chumakova; A.V. Zhivoderov
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- French
- Weight
- 192 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract The reaction of 2(1__H__)‐pyrazinones 1 and 1,2,4‐triazoline‐3,5‐diones 3 was investigated by comparing that of 1 with singlet oxygen. 2(1__H__)‐Pyrazinones 1 reacted in Diels‐Alder fashion with 1,2,4‐triazoline‐3,5‐diones 3 to afford [4+2]‐adducts 4–17 in high yields.
Full details on the reactivity of the title compound as 4π ketene acetals and aminals, as well as several cyclic enol ethers were used as dienophiles in these investigations. A component in inverse-type Diels-Alder reactions, including kinetic data, are reported. Donor-substituted alkynes, number of
## Abstract magnified image An efficient one‐pot access for the synthesis of the previously unreported tetracyclic fused pyrimido‐[4″,5″:4′,5′]thieno[3′,2′:4,5]thieno[3,2‐__d__]pyrimidine (**3**) and 1,2,3‐triazine[4″,5″:4′,5′]thieno‐[3′,2′:4,5]thieno‐[3,2‐__d__]‐1,2,3‐triazine (**5**) heteroaroma