The Synthesis of Certain Phomentrioloxin A Analogues and Their Evaluation as Herbicidal Agents
作者:Ehab S. Taher、Prue Guest、Amanda Benton、Xinghua Ma、Martin G. Banwell、Anthony C. Willis、Tobias Seiser、Trevor W. Newton、Johannes Hutzler
DOI:10.1021/acs.joc.6b02372
日期:2017.1.6
A series of 28 analogues of the phytotoxic geranylcyclohexentriol (−)-phomentrioloxin A (1) has been synthesized through cross-couplings of various enantiomerically pure haloconduritols or certain deoxygenated derivatives with either terminal alkynes or borylated alkenes. Some of these analogues display modest herbicidal activities, and physiological profiling studies suggest that analogue 4 inhibits
Chemoenzymatic Synthesis of Advanced Intermediates for Formal Total Syntheses of Tetrodotoxin
作者:Daler Baidilov、Lukas Rycek、John F. Trant、Jordan Froese、Brennan Murphy、Tomas Hudlicky
DOI:10.1002/anie.201804602
日期:2018.8.20
Advanced intermediates for the syntheses of tetrodotoxin reported by the groups of Fukuyama, Alonso, and Sato were prepared. Key steps include the toluene dioxygenase mediated dihydroxylation of either iodobenzene or benzyl acetate. The resulting diene diols were transformed into Fukuyama's intermediate in six steps, into Alonso's intermediate in nine steps, and into Sato's intermediate in ten steps
Chemoenzymatic Synthesis of (+)-Asperpentyn and the Enantiomer of the Structure Assigned to Aspergillusol A
作者:Ping Lan、Lauren E. White、Ehab S. Taher、Prudence E. Guest、Martin G. Banwell、Anthony C. Willis
DOI:10.1021/acs.jnatprod.5b00304
日期:2015.8.28
ent-2, the enantiomer of the structure, 2, assigned to the natural product aspergillusol A are reported. Both reaction sequences employ the enzymatically derived and enantiomerically pure cis-1,2-dihydrocatechol 4 as starting material and use Sonogashira cross-coupling chemistry to install the required enyne side-chain. The 1H and 13C NMR spectroscopic data derivedfrom compound ent-2 match those reported
报道了分配给天然产物曲霉酚A的(+)-asperpentyn(1)和化合物ent - 2(结构2的对映异构体)的总合成。这两个反应序列均使用酶衍生和对映体纯的顺式-1,2-二氢邻苯二酚4作为起始原料,并使用Sonogashira交叉偶联化学方法安装所需的烯炔侧链。来自化合物ent - 2的1 H和13 C NMR光谱数据 与报道的曲霉酚A匹配,因此表明该天然产物的总体结构已正确分配,尽管其绝对立体化学仍不清楚。
The first enantioselective strategy towards speciosins
作者:Alejandro Peixoto de Abreu Lima、Leopoldo Suescun、Enrique Pandolfi、Valeria Schapiro
DOI:10.1039/c8nj06158k
日期:——
We introduce chirality with a biotransformation and a side chain with a Sonogashira reaction, for the first enantioselective strategy for speciosins.
Chemoenzymatic and enantiodivergent routes to 1,2-ring-fused bicyclo[2.2.2]octane and related tricyclic frameworks
作者:Kerrie A. B. Austin、Jon D. Elsworth、Martin G. Banwell、Anthony C. Willis
DOI:10.1039/b921600f
日期:——
New and simple protocols are described for the conversion of the enzymatically-derived and enantiomerically pure cis-1,2-dihydrocatechol 7 (X = I) and its 6-methylated derivative into either antipodal form of compounds embodying the tricyclic frameworks of terpenoids 1–6. Key steps include intramolecular Diels–Alder (IMDA) and (in some cases) singlet or triplet-based photochemical processes.