作者:Filipa Silva、Shaista S. Khokhar、Danielle M. Williams、Robert Saunders、Gareth J. S. Evans、Michael Graz、Thomas Wirth
DOI:10.1002/anie.201808605
日期:2018.9.17
We describe a short total synthesis of ajoene, a major biologically active constituent of garlic. The instability of allicin as the only other known alternative starting material has led to the development of a reliable procedure for the synthesis of ajoene from simple building blocks that is also suitable for upscale operations.
Facile synthesis of functionalised spiroethers via radical cyclisations
作者:Donald S. Middleton、Nigel S. Simpkins、Nicholas K. Terrett
DOI:10.1016/s0040-4039(00)80286-5
日期:1988.1
Alcohols bearing suitable chains for radical initiation are smoothly condensed with cyclic β-diketones to afford systems which undergo radicalcyclisation to give various spiroether products.
photoinduced decarboxylative C-Se bond-forming reaction employing alkyl N-hydroxyphthalimide esters as alkylation reagents and acid red 94 as an inexpensive photocatalyst has been documented. A broad range of alkyl N-hydroxyphthalimide esters were tolerated for this decarboxylation process, providing a series of unsymmetrical monoselenides with good to excellent yields. The mild conditions and the excellent
Total Synthesis of Jatrophane Diterpenes from <i>Euphorbia characias</i>
作者:Christoph Schnabel、Martin Hiersemann
DOI:10.1021/ol900819u
日期:2009.6.18
The enantioselective total synthesis of the jatrophane diterpene (-)-15-O-acetyl-3-O-propionylcharaciol is described. Starting from an advanced cyclopentane building block, a B-alkyl Suzuki-Miyaura cross-coupling and carbonyl addition were utilized to assemble a fully functionalized triene, and a ring-closing metathesis was then employed to construct the rigid 12-membered ring. Twenty-five years after the original report on the isolation of the natural product, our total synthesis unambiguously corroborates the original tentative structural assignment.
Oxidative radical cyclisations onto imidazoles and pyrroles using Bu3SnH
作者:Fawaz Aldabbagh、W.Russell Bowman、Emma Mann
DOI:10.1016/s0040-4039(97)10052-1
日期:1997.11
Oxidative radical cyclisation using Bu3SnH has been used for the synthesis of [1,2-c]-fused imidazoles and [1,2-a]-fused pyrroles from imidazolecarbaldehydes and acylpyrroles respectively. The intermediate nucleophilic N-alkyl radicals cyclise onto imidazole and pyrrole rings followed by oxidative re-aromatisation. (C) 1997 Elsevier Science Ltd.