Kadsulignans L-N, three dibenzocyclooctadiene lignans from Kadsura coccinea
作者:Jia-Sen Liu、Liang Li
DOI:10.1016/0031-9422(94)00557-a
日期:1995.1
Abstract Three new lignans, kadsulignans L-N, were isolated from the seeds of Kadsuracoccinea , of which kadsulignan M shows anti-HIV activity in vitro . Their structures, including absolute configurations, were elucidated by spectroscopic analysis and chemical conversions. In addition, their atropisomerization and CD rule for assignment of biphenyl configuration were also discussed and the biphenyl
Conformation and reactivity in dibenzocyclooctadienes (DBCOD). A general approach to the total synthesis of fully substituted DBCOD lignans via borostannylative cyclization of α,ω-diynes
作者:Wei Gong、T. V. RajanBabu
DOI:10.1039/c3sc51751a
日期:——
Pd(II)-catalysts, to give highly functionalized DBCOD precursors. The configuration of the newly created, axially chiral, 1,2-bis-alkylidene moiety is controlled by the resident chirality of the starting biphenyls and the configurations of the benzylic positions. New chemistry of the bis-alkylidenes described in this paper enables the firsttotalsyntheses of a wide variety of DBCOD natural products, fully functionalized