Tandem [4+2] Cycloaddition/Aromatization Sequence of Allenyl 2-Bromo-3-vinylcyclohex-2-enyl Thioether to Naphtho[1,8-bc]thiophene
摘要:
A concise synthetic route of tetrahydro-3H-naphtho[1,8-bc]thiophene was developed. Allenyl 2-bromo-3-vinylcyclohex-2-enyl thioether underwent a tandem [4+2] cycloaddition/aromatization sequence to produce the naphthothiophene with high yield. A density functional study for the transition and reaction enthalpies was performed to elucidate the details of the reaction.
Halogen effect on tandem [4+2] cycloaddition/aromatization sequence of allenyl 2-halo-3-vinylcyclohex-2-enyl ether
作者:Noriyuki Hatae、Ichiro Suzuki、Tominari Choshi、Satoshi Hibino、Chiaki Okada、Eiko Toyota
DOI:10.1016/j.tetlet.2014.05.074
日期:2014.7
intramolecular cycloaddition reactions. Allenyl 2-halogenated-3-vinylcyclohex-2-enyl ethers underwent a tandem [4+2] cycloaddition/aromatization reaction to afford the corresponding tetrahydro-3H-naphtho[1,8-bc]furan compound in high yield.
取代基对二烯部分的立体和焓效应在分子内环加成反应中起关键作用。对烯丙基2-卤代-3-乙烯基环己-2-烯基醚进行串联[4 + 2]环加成/芳构化反应,以高收率得到相应的四氢-3H-萘[1,8- bc ]呋喃化合物。
A One-Pot Sequence of Stille and Heck Couplings: Synthesis of Various 1,3,5-Hexatrienes and Their Subsequent 6π-Electrocyclizations
作者:Paultheo von Zezschwitz、Frauke Petry、Armin de Meijere
Palladium-catalyzedcross-couplingreactions of 2-bromocyclohex-1-enyl triflates 7 and 11 with a variety of alkenylstannanes occurred chemoselectively at the site of the triflate leaving group to give bromobutadienes which readily underwent Heck reactions with acrylates and styrene. Both steps could be performed in the same flask to give differentially functionalized hexatrienes in up to 88% overall
Tandem [4+2] Cycloaddition/Aromatization Sequence of Allenyl 2-Bromo-3-vinylcyclohex-2-enyl Thioether to Naphtho[1,8-bc]thiophene
作者:Noriyuki Hatae、Aiichirou Kaji、Chiaki Okada、Eiko Toyota
DOI:10.3987/com-14-s(k)48
日期:——
A concise synthetic route of tetrahydro-3H-naphtho[1,8-bc]thiophene was developed. Allenyl 2-bromo-3-vinylcyclohex-2-enyl thioether underwent a tandem [4+2] cycloaddition/aromatization sequence to produce the naphthothiophene with high yield. A density functional study for the transition and reaction enthalpies was performed to elucidate the details of the reaction.