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.