Total synthesis of (.+-.)-dihydropinidine, (.+-.)-monomorine I, and (.+-.)-indolizidine 223AB (gephyrotoxin 223AB) by intramolecular nitroso Diels-Alder reaction
Titanium-Mediated Alkylative Cyclizations of 1,3-Diene-Tethered Esters
作者:Long Guo Quan、Jin Kun Cha
DOI:10.1021/ol016350n
日期:2001.8.1
[reaction: see text]. An alkylative titanium-mediated cyclization reaction of 1,3-diene-tethered carboxylic esters has been developed by employing an in situ generated titanacyclopropane intermediate to afford trans-2-alkenyl cyclohexanols.
Molecular design of diene monomers containing an ester functional group for the synthesis of poly(diene sulfone)s by radical alternating copolymerization with sulfur dioxide
作者:Akikazu Matsumoto、Sungi Lee、Haruyuki Okamura
DOI:10.1002/pola.27528
日期:2015.4.15
Functionalpoly(diene sulfone)s are prepared by the radical alternating copolymerization of 1,3‐diene monomerscontaining an ester substituent with sulfur dioxide. Methyl 3,5‐hexadienoate (MH) and methyl 5,7‐octadienoate (MO) with both an alkylene spacer and a terminal diene structure are suitable to produce a high‐molecular‐weight copolymer in a high yield, while the copolymerization of 5,7‐nonadienoic
作者:James H. Rigby、Chrisantha H. Senanayake、Sushil Rege
DOI:10.1021/jo00254a040
日期:1988.9
Studies on Intramolecular Higher-Order Cycloaddition Reactions
作者:James H. Rigby、Sushil D. Rege、Vincent P. Sandanayaka、Margarita Kirova
DOI:10.1021/jo9518009
日期:1996.1.1
Thermal, metal-free, and metal-promoted intramolecular higher-order cycloadditions are described. Substrates in which the tropone (2,4,6-cycloheptatrien-1-one) nucleus is tethered to various diene moieties undergo exo-selective [6 pi + 4 pi] cycloaddition under thermal conditions to afford stereochemically defined tricyclic products. The substrates employed in this study were prepared by addition of the Grignard derivative of the given diene side-chain unit to 2-chlorotropone, In each instance, the requisite 2-substituted tropone was obtained directly from these reaction sequences. A similar study was conducted on the corresponding chromium(0) complexes of related tropone and cycloheptatriene-based substrates. In the cases involving metal mediation both thermal and photochemical activation were effective for delivering cycloadducts. The metal-promoted reactions were shown to proceed exclusively via an endo-selective pathway, which is stereocomplementary to the course of the thermal, metal-free reactions. A tandem Cr(0)-promoted 1,5-H shift-[6 pi+2 pi] cycloaddition protocol is also reported with several systems.
HUDLICKY T.; SHETH J. P., TETRAHEDRON LETT., 1979, NO 29, 2667-2670