Unusual Diastereoselectivity in Intramolecular Diels−Alder Reactions of Substituted 3,5-Hexadienyl Acrylates. Preference for a Boatlike Structure of the Six-Atom Tether Due to Ester Overlap
作者:Michael E. Jung、Adrian Huang、Ted W. Johnson
DOI:10.1021/ol000104e
日期:2000.6.1
Thermolysis of the 3,5-hexadienyl acrylates (a) proceeds via the transition state E in which the connecting chain adopts a boatlike conformation due to a preference for maintaining ester overlap to afford the products b with good diastereoselectivity.
Intramolecular Diels−Alder Reactions of Ester-Tethered 1,7,9-Decatrienoates: Bis[chloro(methyl)aluminum]trifluoromethanesulfonamide as a Catalyst
作者:Akio Saito、Hisanaka Ito、Takeo Taguchi
DOI:10.1021/ol026963f
日期:2002.12.1
The intramolecular Diels-Alder reaction of 1,7,9-decatrienoate derivative with an ester tether is efficiently catalyzed by the bidentate Lewis acid,/bis-aluminated trifluoromethanesulfonamide.
Intramolecular Diels−Alder Reactions of Decatrienoates: Remote Stereocontrol and Conformational Activation<sup>1</sup>
作者:Pilho Kim、Michael H. Nantz、Mark J. Kurth、Marilyn M. Olmstead
DOI:10.1021/ol005886q
日期:2000.6.1
The intramolecular Diels-Alder (IMDA) reactions of C(8)-substituted decatrienoates have been studied. The stereospecific formation of 11 via an endo-boat-9 transition state attests to the powerful directing influence of a C(8) substituent in the IMDA of decatrienoate. In addition, the contrasting observations that stereospecific 9 --> 11 occurs at room temperature while the nor-tert-butyl substrate