Total synthesis, stereochemical elucidation and biological evaluation of Ac<sub>2</sub>SGL; a 1,3-methyl branched sulfoglycolipid from Mycobacterium tuberculosis
作者:Danny Geerdink、Bjorn ter Horst、Marco Lepore、Lucia Mori、Germain Puzo、Anna K. H. Hirsch、Martine Gilleron、Gennaro de Libero、Adriaan J. Minnaard
DOI:10.1039/c2sc21620e
日期:——
part of a vaccine. Here, we report the first asymmetric total synthesis of 1. Two approaches were developed for the synthesis of hydroxyphthioceranic acid (4), its polypropionate part, thereby establishing the absolute stereochemistry of the C17 hydroxyl function to be of (R)-configuration. Subsequently, 4 was regioselectively connected to the trehalose core and after selective sulfation and a final
Synthetic Studies on the Bryostatins: Preparation of a Truncated BC-Ring Intermediate by Pyran Annulation
作者:Gary E. Keck、Anh P. Truong
DOI:10.1021/ol050511w
日期:2005.5.1
[reaction: see text]. A synthesis of a potential BC-ring subunit (C9-C27) for bryostatin 1, a remarkably potent anticancer agent, has been developed in 16 steps and 18% overall yield. The key features of this route include a BITIP-catalyzed asymmetric allylation reaction, chelation-controlled allylations, a hydroformylation reaction, and a pyran annulation reaction.
Synthesis of α,β-Unsaturated Thiocarboxylic Acid<i>S</i>-Esters via Horner Emmons Olefination
作者:Ernst Schaumann、Bernd Mergardt、Stefan Fittkau
DOI:10.1055/s-1990-26784
日期:——
The title compounds are prepared by an efficient one-pot reaction using readily available phosphonates and S-alkyl carbonchloridothioates. The reaction is capable of variation in the phosphonate and especially in the carbonochloridothioate components.
Enantioselective Approach to Quinolizidines: Total Synthesis of Cermizine D and Formal Syntheses of Senepodine G and Cermizine C
作者:Nagarathanam Veerasamy、Erik C. Carlson、Nathan D. Collett、Mrinmoy Saha、Rich G. Carter
DOI:10.1021/jo400324t
日期:2013.5.17
The formal syntheses of C5-epi-senepodine G and C5-epi-cermizine C have been accomplished through a novel diastereoselective, intramolecular amide Michael addition process. The total synthesis of cermizine D has been achieved through use of an organocatalyzed, heteroatom Michael addition to access a commonintermediate. Additional key steps of this sequence include a matched, diastereoselective alkylation
C的正式合成5 -外延-senepodine G和C 5 -外延-cermizine C 是通过一种新型的非对映选择性、分子内酰胺迈克尔加成过程完成的。cermizine D 的全合成是通过使用有机催化的杂原子迈克尔加成获得常见中间体来实现的。该序列的其他关键步骤包括使用碘甲基苯硫醚和砜-醛偶联/还原脱硫序列进行匹配的非对映选择性烷基化,以结合主要亚基。已经在功能密集的耦合伙伴上探索了 Hartwig 式 C-N 耦合的效用。已经研究了对 α,β-不饱和砜的非对映选择性共轭加成,这仅通过六步即可从市售起始材料中提供关键的砜中间体。N -Boc 保护的哌啶砜。
Formal Synthesis of the Anti-Angiogenic Polyketide (−)-Borrelidin under Asymmetric Catalytic Control
作者:Ashoka V. R. Madduri、Adriaan J. Minnaard
DOI:10.1002/chem.201001284
日期:——
potent anti‐angiogenesis activity. This paper describes its formal totalsynthesis by the most efficient route to date. This modular approach takes optimal benefit of asymmetric catalysis and permits the synthesis of analogues; in addition, the high yields and selectivities obtained eliminate the need for separation of stereoisomers. The upper half of borrelidin has been accessed by iterative copper‐catalysed