Stereoselective synthesis of substituted 1,3,5-hexatrienes from diallylic sulfones
作者:Xiao-Ping Cao、Tze-Lock Chan、Hak-Fun Chow、Jingren Tu
DOI:10.1039/c39950001297
日期:——
Substituted 1,3,5-hexatrienes 7 can be prepared in excellent yields and with good stereoselectivity from diallylic sulfones 6 employing a modified Ramberg–Bäcklund reaction.
A stereoselective synthesis of 1,6-diphenyl-1,3,5-hexatrienes utilising 4,4,6-trimethyl-2-vinyl-1,3,2-dioxaborinane as a two-carbon alkenyl building block
作者:Andrew P. Lightfoot、Steven J. R. Twiddle、Andrew Whiting
DOI:10.1039/b507900d
日期:——
geometries were stereoselectively prepared from just two starting materials: iodobenzene and 4,4,6-trimethyl-2-vinyl-1,3,2-dioxaborinane via a series of Heck, Suzuki-Miyaura and stereocontrolled iododeboronation reactions. These results demonstrate how 4,4,6-trimethyl-2-vinyl-1,3,2-dioxaborinane can be used as a genuine two-carbon vinyl-dianion building block in stereocontrolled polyene synthesis.
Photoisomerization of All-<i>cis</i>-1,6-diphenyl-1,3,5-hexatriene in the Solid State and in Solution: A Simultaneous Three-Bond Twist Process
作者:Jack Saltiel、Dimitrios Papadimitriou、Tallapragada S. R. Krishna、Zhen-Nian Huang、Govindarahan Krishnamoorthy、Somchoke Laohhasurayotin、Ronald J. Clark
DOI:10.1002/anie.200902724
日期:2009.10.12
Disrotatory bicycle pedals: Irradiation of the title compound in the solid state gives the all‐trans isomer directly in a crystal‐to‐crystal reaction. This threefold cis–trans photoisomerization is proposed to proceed by a two‐stage mechanism that is consistent with two simultaneous bicycle‐pedal processes occurring in disrotatory fashion about the central bond.