Total Synthesis of a Hypothetical Macroketone of Migrastatin
作者:Rahul Choudhury、D. Srinivasa Reddy
DOI:10.1002/ejoc.202100484
日期:2021.6.7
We have accomplished the synthesis of ‘hypotheticalmacroketone’ (a novel migrastatin analogue) for the first time. We have used TiCl4 mediated vinylogous Mukaiyama aldol reaction (VMAR) to establish the required three stereocenters on the key intermediate. Grubbs’ 2nd generation catalyzed RCM reaction was utilized to construct the 14 membered ring macrocycle.
Total Synthesis of the Originally Proposed and Revised Structures of Palmerolide A and Isomers Thereof
作者:K. C. Nicolaou、Ya-Ping Sun、Ramakrishna Guduru、Biswadip Banerji、David Y.-K. Chen
DOI:10.1021/ja710485n
日期:2008.3.1
Palmerolide A is a recently disclosed marine natural product possessing striking biological properties, including potent and selective activity against the melanoma cancer cell line UACC-62. The total syntheses of five palmerolide A stereoisomers, including the originallyproposed (1) and the revised [ent-(19-epi-20-epi-1)] structures, have been accomplished. The highly convergent and flexible strategy
The synthesis of a new ansamycin macrolactam derivative that contains an ansachain based on ansamitocin and an aromatic core related to geldanamycin is reported. The selective introduction of the cyclic carbamoyl group at C7 and C9 relies on a biotransformation using a mutant strain of S. hygroscopicus, the geldanamycin producer. The ansamycin hybrid forms atropisomers that differ in their antiproliferative
The Kobayashi aldol reaction has become a prominent transformation in polyketide syntheses. This methodology takes advantage of the directing effects of the Evans auxiliary and allows the stereoselective incorporation of a four carbon segment with two additional methyl branches establishing an anti-relationship between the two newly formed chiral centers. So far this transformation was restricted to
First total synthesis of salinipyrone A using highly stereoselective vinylogous Mukaiyama aldol reaction
作者:Palakuri Ramesh、Harshadas Mitaram Meshram
DOI:10.1016/j.tet.2012.08.035
日期:2012.11
A synthetic approach for the totalsynthesis of salinipyrone A has been developed. Key steps involve the TiCl4-mediated vinylogousMukaiyamaaldolreaction (VMAR) of chiral ketene silyl N,O-acetal with propionaldyhyde, an aldol condensation, Witting olefination, and a cyclization. The synthesis proceeds in eight steps.