The C1–C13fragment of bistramide A was prepared from 5-hexenoic acid in 15 linear steps and in 16% overall yield. The core 2,6-trans-tetrahydropyran ring was obtained via a kinetically controlled oxa-Michael cyclization from the corresponding chiral α,β-unsaturated hydroxyester. This precursor was prepared by using a diastereoselective alkylation reaction using Davies Superquat auxiliary and a diastereoselective
The synthesis of a C1–C14 fragment of the macrolide antibiotic gulmirecin B through formation of the C7–C8 bond by addition of a vinyllithium intermediate to a C1–C7 aldehyde was investigated. This crucial coupling was successful with a vinyllithium reagent corresponding to a C8–C12 fragment. The C8–C12 vinyl bromide was prepared from l -malic acid. The C1–C7 aldehyde building block was synthesized
Total Synthesis of (+)-18-<i>epi</i>-Latrunculol A: Development of a Synthetic Route
作者:Brett D. Williams、Amos B. Smith
DOI:10.1021/jo501733m
日期:2014.10.3
The evolution of an enantioselective totalsynthesis of (+)-18-epi-latrunculol A, a congener of the marine-sponge-derived latrunculins A and B, is reported. Key steps include a late-stage Mitsunobu macrolactonization to construct the 16-membered macrolactone, a mild Carreira alkynylation to unite the northern and southern hemispheres, a diastereoselective, acid-mediated δ-hydroxy enone cyclization/equilibration
报告了 (+)-18- epi -latrunculol A(海洋海绵衍生的 latrunculins A 和 B 的同系物)的对映选择性全合成的演变。关键步骤包括后期 Mitsunobu 大环内酯化以构建 16 元大环内酯、温和的 Carreira 炔基化以统一北半球和南半球、非对映选择性、酸介导的 δ-羟基烯酮环化/平衡序列,以及功能组-耐受交叉复分解以获得烯酮环化前体。
Total Synthesis of Carolacton, a Highly Potent Biofilm Inhibitor
作者:Thomas Schmidt、Andreas Kirschning
DOI:10.1002/anie.201106762
日期:2012.1.23
Metals are the key players in the synthesis of caralacton, a strong inhibitor of bacterial biofilms. The totalsynthesis is based on several metal‐mediated key transformations such as the Ley and the Duthaler–Hafner aldol reactions, the Marshall reaction and Breit's substitution, as well as the Nozaki–Hiyama–Kishi and Negishi–Fu CC coupling reactions.
Revision of the structure of haliclorensin to (S)-7-methyl-1,5-diazacyclotetradecane and confirmation of the new structure by synthesis
作者:Markus R Heinrich、Yoel Kashman、Peter Spiteller、Wolfgang Steglich
DOI:10.1016/s0040-4020(01)01020-1
日期:2001.12
A reinvestigation of the marine alkaloid haliclorensin led to a revision of the proposed structure to 7-methyl-1,5-diazacyclotetradecane. The new structure was confirmed by total synthesis of both optical forms. According to chiroptical measurements and GC–MS investigations, natural haliclorensin consists of a 3:1 mixture of the (S)- and (R)-enantiomers.