METHOD OF PREPARATION OF STEREOSPECIFIC QUINONE DERIVATIVES
申请人:Mehta Dilip S.
公开号:US20150126763A1
公开(公告)日:2015-05-07
The description provides processes for the regio and stereospecific synthesis of polyprenylatedquinone derivatives, such as Vitamin K1, K2 and Ubiquinone, exploiting dithioacetals, especially 1,3-dithiane, mediated Umpolung chemistry which works along a new concept “Inhibiting resonance delocalization (IRD)” to overcome isomerization generated due to delocalization of allyliccarbanion on the π-electron cloud of an allylic systems by the conventional synthesis.
Total Synthesis of (−)-Tirandamycin C Utilizing a Desymmetrization Protocol
作者:J. S. Yadav、Santu Dhara、Sk. Samad Hossain、Debendra K. Mohapatra
DOI:10.1021/jo3016709
日期:2012.11.2
A highly stereoselective total synthesis of (−)-tirandamycin C has been achieved following a desymmetrization protocol developed in our group, Horner–Wadsworth–Emmonsolefination, acid-catalyzed ketalization, Still–Gennari (Z)-selectiveolefination, and Dieckmann cyclization as key reactions.
SMALL MOLECULE COMPOUNDS SELECTIVE AGAINST GRAM-NEGATIVE BACTERIAL INFECTIONS
申请人:DeBrabander Jef
公开号:US20150329582A1
公开(公告)日:2015-11-19
The described invention provides fully synthetic, biologically active mangrolide A. It describes schemes to chemically synthesize mangrolide A, intermediates and analogs of mangrolide A, and their antibacterial activity.
Total Synthesis of Repraesentin F and Configuration Reassignment by a Gold(I)-Catalyzed Cyclization Cascade
作者:Sofia Ferrer、Antonio M. Echavarren
DOI:10.1021/acs.orglett.8b02478
日期:2018.9.21
of repraesentin F has been accomplished by a highly diastereoselective gold(I)-catalyzed cyclization cascade as the key step. This cycloisomerization/Prins-type tandem transformation enabled direct access to the atypical tricyclic carbon skeleton of the natural product with the required syn/anti/syn ring fusion. This synthetic effort also allowed reassignment of the relative configuration of repraesentin
repraesentin F的第一个全合成是通过高度非对映选择性金(I)催化的环化级联反应完成的,这是关键步骤。这种环异构化/ Prins型串联转化可通过所需的syn / anti / syn环融合直接进入天然产物的非典型三环碳骨架。这种合成的努力还允许重新分配瑞拉西汀F的相对构型并确定其绝对构型。
Total Synthesis of Bistramide A and Its 36(
<i>Z</i>
) Isomers: Differential Effect on Cell Division, Differentiation, and Apoptosis
作者:Loïc Tomas、Gustav Boije af Gennäs、Marie Aude Hiebel、Peter Hampson、David Gueyrard、Béatrice Pelotier、Jari Yli‐Kauhaluoma、Olivier Piva、Janet M. Lord、Peter G. Goekjian
DOI:10.1002/chem.201102462
日期:2012.6.11
The total synthesis of bistramide A and its 36(Z),39(S) and 36(Z),39(R) isomers shows that these compounds have different effects on cell division and apoptosis. The synthesis relies on a novel enol ether‐forming reaction for the spiroketal fragment, a kinetic oxa‐Michael cyclization reaction for the tetrahydropyran fragment, and an asymmetric crotonylation reaction for the amino acid fragment. Preliminary