Diastereoselectivity in the directed aldol condensation of 2-trimethylsiloxyfuran with aldehydes. A stereodivergent route to threo and erythro δ-hydroxy-γ-lactones
作者:Charles W. Jefford、Danielle Jaggi、John Boukouvalas
DOI:10.1016/s0040-4039(01)83855-7
日期:1987.1
Threo and erythro-δ-hydroxy-α,β-unsaturated γ-lactones are obtained with useful diastereoselection by condensing 2-trimethylsiloxyfuran and aldehydes by varying the reaction reaction conditions. A stereomechanistic rationale is presented together with a practical two-step synthesis of the threo and erythro 5-hydroxy-4-decanolides (L factors).
Concise syntheses of the polyketide natural product (–)-muricatacin and (–)-( R , R )-L-factor (natural product enantiomer) were achieved in four steps by employing an organocatalytic asymmetric direct vinylogous aldol reaction of γ-crotonolactone and suitable aliphatic aldehydes as the key step.
聚酮化合物天然产物 (-)-muricatacin 和 (-)-( R , R )-L-因子(天然产物对映异构体)的简明合成是通过采用 γ-巴豆内酯和合适的脂肪醛作为关键步骤。
Study of the structure-activity relationships of the acetogenin of annonaceae, muricatacin and analogues
A study of the structure-cytotoxic activity of the acetogenin of Annonaceae, muricatacin 1, is reported. Indeed, muricatacin 1 has shown promising antitumoral activity. Therefore several 5-hydroxy-4-alkanolides were prepared and then tested against KB and VERO cell lines. A few other analogues were synthesized and tested against both cell lines. Thus this work allowed us to better determine the pharmacophore of the molecule and to propose muricatacin 1 instead of a more complicated acetogenin of Annonaceae as a lead compound in the search for new antineoplastic agents.
Synthesis of furanone-Based natural product analogues with quorum sensing antagonist activity
作者:Thomas Hjelmgaard、Tobias Persson、Thomas B Rasmussen、Michael Givskov、John Nielsen
DOI:10.1016/s0968-0896(03)00295-5
日期:2003.7
The synthesis of 5- and 3-(1'-hydroxyalkyl)-substituted 5H-furan-2-ones 4a-d and 8a-d as well as 5-alkylidene-5H-furan-2-ones 5a-d is described. A study of the structure-activity relationship of these furanone-based natural product analogues towards two different quorum sensing systems is reported. Although the synthesized compounds are not as potent quorum sensing inhibitors as some natural counterparts and a synthetic analogue hereof, interesting structure-activity relationships are seen. (C) 2003 Elsevier Science Ltd. All rights reserved.
Silica sulfuric acid as a reusable heterogeneous catalyst for the diastereoselective Mukaiyama aldol reaction of 2-(trimethylsilyloxy)furan: facile synthesis of γ-butenolides
作者:Gowravaram Sabitha、M. Nagendra Prasad、M. Ramesh、J. S. Yadav
DOI:10.1007/s00706-010-0388-z
日期:2010.11
Silica sulfuric acid was found to be an efficient catalyst for the vinylogous Mukaiyama aldol reaction of 2-(trimethylsilyloxy)furan with various aldehydes with good diastereoselection. The reaction proceeds rapidly in THF, affording the corresponding 5-(arylhydroxymethyl) furan-2(5H)-ones in good yields. This method offers significant advantages such as experimental simplicity, and recoverability and reusability of the catalyst.