作者:Lluís Bosch、Laura Mola、Elena Petit、Mar Saladrigas、Jorge Esteban、Anna M. Costa、Jaume Vilarrasa
DOI:10.1021/acs.joc.7b01973
日期:2017.10.20
A formal totalsynthesis of the cytotoxic macrolide amphidinolide E is reported. The strategic steps are three Julia–Kocienski reactions (J–K), for the formation of the C5–C6, C9–C10, and C17–C18 double bonds, a Suzuki–Molander C21–C22 bond formation reaction, and a Kita–Trost macrolactonization. The “instability” of the two dienic systems and of the stereocenter at C2 (allylic methine, α to the carboxy
Synthetic Studies toward the Total Synthesis of Amphidinolide H1
作者:Gang Zhao、Lisheng Deng、Zhixiong Ma
DOI:10.1055/s-2008-1032101
日期:——
A convergent synthesis of the macrolide core as the immediate precursor to amphidinolide H1 is described, which features a palladium-catalyzed Stille cross-coupling, a methyl ketone diastereoselective aldol reaction, a Mitsunobu esterification, and an intramolecular ring-closing metathesis (RCM) reaction to construct the 26-membered macrocycle as key steps.
Iododesilylation of TIPS-, TBDPS-, and TBS-Substituted Alkenes in Connection with the Synthesis of Amphidinolides B/D
作者:Mireia Sidera、Anna M. Costa、Jaume Vilarrasa
DOI:10.1021/ol2020187
日期:2011.9.16
The C-Si bonds of triisopropylsilyl-substituted alkenes, 1,3-dienes, and related multifunctional substrates, as well as analogous C-TBDPS and C-TBS bonds, are readily and chemoselectively cleaved with NIS (or other sources of I(+), such as N-iodosaccharin, 1,3-diodohydantoin, and Ipy(2)BF(4)). The desired iodoalkenes are obtained stereospecifically without byproducts, provided that the reactions are carried out in CF(3)CHOHCF(3) and, in general, with 30 mol % of Ag(2)CO(3) (or AgOAc/2,6-Iutidine) as an additive. Fragment C10-C18 of cytotoxic amphidinolides B1-B3 and D has been synthesized using this improved procedure.
Synthesis and antiproliferative activity of new tonantzitlolone-derived diterpene derivatives
The synthesis of the diterpene (+)-tonantzitlolone A and a series of derivatives is reported. The study includes the determination of their antiproliferativeactivities against selected cancer cell lines.
Enantioselective synthesis of the C1C28 portion of the cytotoxic natural product, amphidinolide B1
作者:Duck-Hyung Lee、Suk-Won Lee
DOI:10.1016/s0040-4039(97)10103-4
日期:1997.11
The C1C28 portion of the cytotoxic natural product, amphidinolide B1 (1a), was synthesized enantioselectively using as key steps Evans chiral oxazolidinone chemistry, Sharpless asymmetric epoxidation, and the orthoester Claisenrearrangement. The overall yield is 3.6% in 13 step sequence starting from propionyl oxazolidinone 2.