Concise Enantioselective Synthesis of Naturally Active (<i>S</i>)-3-Hydroxypiperidine
作者:Soumen Dey、Pratibha U. Karabal、Arumugam Sudalai
DOI:10.1080/00397911.2015.1033428
日期:2015.7.3
efficient enantioselective synthesis of natural product (S)-3-hydroxypiperidine has been achieved starting from commercially available raw materials employing two catalytic routes: (i) cocatalyzed hydrolytic kineticresolution (HKR) of racemic methyl-3-(oxiran-2-yl)propanoate; (ii) proline-catalyzed α-aminooxylation followed by Horner–Wardsworth–Emmons olefination in high enantiomericpurity (97% ee)
Synthesis of C1C11 fragment of annonacin: a polyketide acetogenin of Annonaceae
作者:Bruno Figadère、Xavier Franck、André Cavé
DOI:10.1016/0040-4039(95)00083-o
日期:1995.3
tri-isopropylsilyloxy-4-tert-butyldimethylsilyloxy-10-tert-amyloxy-11-undecanoate 1 has been synthesized from L-glutamic acid. This compound is a key intermediate in the total synthesis of annonacin, an acetogenin of Annonaceae.
Gold(I)-Mediated Cycloisomerization/Cycloaddition Enables Bioinspired Syntheses of Neonectrolides B–E and Analogues
作者:Thomas J. Purgett、Matthew W. Dyer、Bryce Bickel、James McNeely、John A. Porco
DOI:10.1021/jacs.9b06355
日期:2019.9.25
neonectrolides B-E is described. The synthesis relies on gold-catalyzed 6-endo-dig hydroarylation of an unusual enynol substrate as well as a one-pot Rieche formylation/cyclization/deprotection sequence to efficiently construct the tricyclic oxaphenalenone framework in the form of a masked ortho-quinone methide (o-QM). A tandem cycloisomerization/[4+2] cycloaddition strategy was employed to quickly construct
描述了合成路线到 oxaphenalenone (OP) 天然产物新内酯 BE 的开发。该合成依赖于金催化的不寻常烯醇底物的 6-endo-dig 加氢芳基化以及单锅 Rieche 甲酰化/环化/脱保护序列,以有效地构建以掩蔽邻醌甲基化物形式存在的三环氧杂菲酮骨架。 o-质量管理)。采用串联环异构化/[4+2] 环加成策略快速构建类似于新油桃内酯的分子。三环 OP 天然产物 SF226 可以转化为 corymbiferan 内酯 E 和相关的掩蔽 o-QM。我们的研究最终将串联反应序列应用于合成新油桃 BE 以及以前未报道的外型非对映异构体。
Enantioselective synthesis of protected forms of (3R,5R)-5-hydroxypiperazic acid useful for synthesis
作者:Kristopher M. Depew、Theodore M. Kamenecka、Samuel J. Danishefsky
DOI:10.1016/s0040-4039(99)01958-9
日期:2000.1
Protected versions of (3R,SR)-5-hydroxypiperazic acid were synthesized enantioselectively in two novel ways. The first derives its chirality from D-glutamic acid while the second uses an Evans amination and a diastereoselective bromolactonization to establish the two chiral centers. Given that this amino acid is a component of several depsipeptides, these two routes enable the synthesis of multigram quantities of protected versions of 2. (C) 2000 Elsevier Science Ltd. All rights reserved.