Synthesis of the C(18)−C(34) Fragment of Amphidinolide C and the C(18)−C(29) Fragment of Amphidinolide F
作者:Sudeshna Roy、Christopher D. Spilling
DOI:10.1021/ol102345v
日期:2010.11.19
A convergent synthesis of the C(18)−C(34) fragment of amphidinolide C and the C(18)−C(29) fragment of amphidinolide F is reported. The approach involves the synthesis of the common intermediate tetrahydrofuranyl-β-ketophosphonate via cross metathesis, Pd(0)-catalyzed cyclization, and hydroboration−oxidation. The β-ketophosphonate was coupled to three side chain aldehydes using a Horner−Wadsworth−Emmons
报道了amphidinolide C的C(18)-C(34)片段和amphidinolide F的C(18)-C(29)片段的收敛合成。该方法涉及通过交叉复分解、Pd(0)-催化环化和硼氢化-氧化合成常见的中间体四氢呋喃基-β-酮膦酸酯。使用 Horner-Wadsworth-Emmons (HWE) 烯化反应将 β-酮膦酸酯偶联到三个侧链醛上,得到二烯酮,然后用l- selectride还原得到双环内酯 C 和 F 的片段。
Studies toward the Total Synthesis of Itralamide B and Biological Evaluation of Its Structural Analogs
A and B were isolated from the lipophilic extract of Lyngbya majuscula collected from the eastern Caribbean. Itralamide B (1) showed cytotoxic activity towards human embryonic kidney cells (HEK293, IC50 = 6 μM). Preliminary studies disapproved the proposed stereochemistry of itralamide. In this paper, we will provide a full account of the total synthesis of four stereoisomers of itralamide B and the
Solvent‐Free Synthesis of Quaternary Oxazolidine‐2‐thione β
<sup>3</sup>
‐Amino Ester Analogs
作者:Francesco Soddu、Federico Devoto、Valentina Marras、Pierluigi Caboni、Francesco Secci、David J. Aitken、Angelo Frongia
DOI:10.1002/ejoc.202201115
日期:2022.12.12
organocatalyzed intermolecular cyclization reaction starting from β-substituted γ-hydroxy-α,β-unsaturated esters and aryl isothiocyanates proceeds via an aza-Michael addition to provide previously unknown quaternary oxazolidine-2-thione β 3 ‑aminoesters. A panel of diversely-substituted esters was investigated, including β,γ-disubstituted examples which provided the target molecules with very high