Stereoselective Synthesis of the C1–C22 Carbon Framework of (−)-Amphidinolide K
作者:Somnath S. Chandankar、Sadagopan Raghavan
DOI:10.1021/acs.joc.9b01248
日期:2019.8.2
Two stereoselective routes to the C7–C22 subunit of amphidinolide K are disclosed. Jacobsen’s hydrolytic kinetic resolution and Sharpless’ asymmetric dihydroxylation reactions have been employed for the construction of the tetrahydrofuran ring. The C10–C11, C16–C17, C9–O, and C18–O bonds have been created using α-chloro sulfide intermediates and [2,3] sigmatropic rearrangement. Marshall’s propargylation
Palladium(II)-catalyzed dicarboxymethylation of chiral allylic alcohols: chirality transfer affording optically active diesters containing three contiguous chiral centers
作者:Othman Hamed、Patrick M. Henry、Daniel P. Becker
DOI:10.1016/j.tetlet.2010.04.105
日期:2010.7
This manuscript describes the extension of Stille’s palladium-catalyzed olefin dicarbonylation reaction to chiralallylicalcohols with chiralitytransfer to afford the corresponding chiralalcohol functionalized with bis-carbomethoxy esters, containing three contiguous chiral centers, in good to excellent diastereoselectivities (78–98%).
A general route is described for the preparation of microcystins and nodularins, including new chemistry for the preparation of β-methyl-D-aspartic acid.
Propene as an Atom-Economical Linchpin for Concise Total Synthesis of Polyenes: Piericidin A
作者:Barry M. Trost、Hadi Gholami
DOI:10.1021/jacs.8b08974
日期:2018.9.19
properly elaborated alkyne fragments, leading to the 1,3,6-triene motif of piericidin A. Utilization of propene as a unique alkene, capable of sequentialcoupling with two alkynes, is further illustrated in the context of various 1,3,6-triene products. The latter process proceeds with high atom economy and efficiently gives rise to complex frameworks from readily accessible alkyne substrates. This strategic
公开了一种简洁且收敛的哌啶 A 全合成。合成取决于利用丙烯作为合成关键来合并适当精心设计的炔烃片段,从而产生 piericidin A 的 1,3,6-三烯基序。 将丙烯用作独特的烯烃,能够与两个炔烃顺序偶联,在各种 1,3,6-三烯产品的上下文中进一步说明。后一个过程以高原子经济性进行,并从容易获得的炔烃底物有效地产生复杂的框架。这种战略性的 CC 键形成为合成路线的设计提供了正交范式,从而实现更高的步骤经济性和更有效的多不饱和天然产物的合成。
CHIRALITY TRANSFER IN THE ESTER ENOLATE CLAISEN REARRANGEMENT OF (<i>R</i>)-1-METHYL-(<i>E</i>)-2-BUTENYL HYDROXYACETATE AND ITS APPLICATION TO THE STEREOCONTROLLED PHEROMONE SYNTHESIS
作者:Tamotsu Fujisawa、Kazuhisa Tajima、Toshio Sato
DOI:10.1246/cl.1984.1669
日期:1984.10.5
The esterenolateClaisenrearrangement of (R)-1-methyl-(E)-2-butenyl hydroxyacetate provides complete asymmetric transfer along with 98% erythroselectivity to give (2R,3S)-2-hydroxy-3-methyl-(E)-4-hexenoic acid. Its synthetic utility is demonstrated by the stereocontrolled synthesis of optically active pheromones.