Experimental Determination of the Activation Parameters and Stereoselectivities of the Intramolecular Diels−Alder Reactions of 1,3,8-Nonatriene, 1,3,9-Decatriene, and 1,3,10-Undecatriene and Transition State Modeling with the Monte Carlo-Jumping Between Wells/Molecular Dynamics Method
摘要:
Experimental activation parameters for the intramolecular Diels-Alder reactions of 1,3,8-nonatriene, 1,3,9-decatriene, and 1,3,10-undecatriene have been measured, and the Monte Carlo-Jumping between Wells/Stochastic Dynamics [MC(JBW)/SD] method, which gives relative free energies of activation, was tested as a means to predict stereoselectivities. The predictions are compared to experimental results, and to predictions from quantum and molecular mechanics methods.
Convenient syntheses of hydroindans and hydronaphthalenes
作者:Ta-Shue Chou、Hsi-Hwa Tso、Lee-Jean Chang
DOI:10.1039/c39850000236
日期:——
enes, prepared by direct deprotonation and alkylation of 3-sulpholenes, led to cheletropic extrusion of SO2 followed by intramolecular Diels–Alder reaction to yield the corresponding hydroindans and hydronaphthalenes.
Synthesis of the Pyrrolo[2,3-i]isoquinoline Substructure of the Manzamine Family of Alkaloids
作者:David J. Hart、Jeffrey A. McKinney
DOI:10.1016/s0040-4039(00)99077-4
日期:1989.1
synthesis of the tricyclic pyrrolo[2,3-i]isoquinoline substructure of manzamines A, B ,E and F is described. Reductive alkylation of benzoic acid followed by a 3-aza-6-heptenyl radical cyclization gave octahydro-isoquinoline 9. An electrophile initiated cyclization was used to complete construction of the title ring system.
描述了manzamines A,B,E和F的三环吡咯并[2,3- i ]异喹啉亚结构的首次合成。苯甲酸的还原烷基化,然后进行3-氮杂-6-庚烯基的环化反应,得到八氢异喹啉9。亲电试剂引发的环化反应用于完成标题环系统的构建。
Singlet and triplet excited-state formation in high-energy electron tracks in liquid cis- and trans-decalin as studied by product formation in radiolysis and photolysis
作者:A. Hummel、H. C. de Leng、L. H. Luthjens、L. Wojnárovits
DOI:10.1039/ft9949002459
日期:——
The yields of products formed as a result of irradiation of liquid cis- and trans-decalin with γ-rays and 3 MeV electrons as well as with 7.6eVphotons have been determined by means of gas–liquid chromatography (GLC). The major products for both cis- and trans-decalin are hydrogen, unsaturated C10 products and dimers; in the case of cis-decalin, cis–trans isomerization takes place via a chain reaction
Thermal rearrangements of cyclic allenes retro-ene reactions
作者:John D. Price、Richard P. Johnson
DOI:10.1016/s0040-4039(00)98820-8
日期:1985.1
Flow vacuum thermolysis (500–650°) of 1,2-cyclonona- and 1,2-cyclodecadienes yields, as primary products, terminal enynes and enedienes. Secondary intramolecular Diels-Alder reactions of the enedienes afford cis and trans bicyclics.
Why a Proximity-Induced Diels–Alder Reaction Is So Fast
作者:Elizabeth H. Krenske、Emma W. Perry、Steven V. Jerome、Thomas J. Maimone、Phil S. Baran、K. N. Houk
DOI:10.1021/ol301083q
日期:2012.6.15
Unlike normal Diels–Alder reactions of acyclic alkadienes with alkenes, the vinylbicyclo[2.2.2]octene employed in the Baran totalsynthesis of vinigrol undergoes a quantitative Diels–Alder reaction with a tethered alkene at room temperature. Density functional theory calculations reveal that this unprecedented reactivity originates from a combination of preorganization, diene strain, and tether stabilization