A feasible and umpolung strategy for the synthesis of structurally diverse β-amino ketones has been achieved through TEMPO mediated C−N coupling of cyclopropanols with nitrogennucleophiles. Mechanism studies indicated that in situ generated enones derived from cyclopropanols are the key intermediates and TEMPO play multiple roles, including radical initiator, trapping reagent, a porter of β-hydrogen
通过 TEMPO 介导的环丙醇与氮亲核试剂的 C-N 偶联,已经实现了一种用于合成结构多样的β-氨基酮的可行和 umpolung 策略。机理研究表明,环丙醇原位生成的烯酮是关键中间体,TEMPO 发挥多种作用,包括自由基引发剂、捕获剂、 β-氢的搬运工和原位碱。该协议具有广泛的底物范围、良好的可扩展性和良好至优异的产量,并为在金属和无添加剂条件下合成结构重要的β-氨基酮支架提供了一种替代和补充方法。
Transition metal-free [3 + 3] annulation of cyclopropanols with β-enamine esters to assemble nicotinate derivatives
作者:Jun-Long Zhan、Lin Zhu、Jia-Nan Bai、Jian-Bo Liu、Shi-Han Zhang、Yao-Qiang Xie、Bo-Mei Hu、Yang Wang、Wen-Jun Han
DOI:10.1039/d3ob01662e
日期:——
An atom-economical synthetic approach for preparing structurally important nicotinates under metal- and additive-free conditions was developed.
开发了一种原子经济合成方法,可在无金属和添加剂条件下制备结构重要的烟酸盐。
Synthetic studies toward Swinhoeisterol A: Synthesis of the 6/6/5/7 tetracyclic core
作者:Volha V. Kazlova、Alaksiej L. Hurski
DOI:10.1016/j.tetlet.2023.154840
日期:2024.1
6/6/5/7 Tetracyclic core of Swinhoeisterol A was constructed starting from Wieland-Miescher ketone and silylated ethyl 5–hydroxyvalerate. After modification, the bicyclic and linear subunits were assembled by means of cross-metathesis reaction. Then, cyclopentane C ring was formed by the intramolecular aldol condensation. C17-stereocenter was constructed using Claisen rearrangement followed by the
6/6/5/7 Swinhoeisterol A 的四环核心是从 Wieland-Miescher 酮和甲硅烷基化 5-羟基戊酸乙酯开始构建的。修饰后,通过交叉复分解反应组装双环和线性亚基。然后,通过分子内羟醛缩合形成环戊烷C环。C17-立体中心是使用克莱森重排和脱羰步骤构建的。最后,应用烯反应同时形成环庚烷D环和B环和C环之间的四取代双键。
Kulinkovich, O. G.; Bagutskii, V. V., Russian Journal of Organic Chemistry, 1997, vol. 33, # 6, p. 830 - 834
作者:Kulinkovich, O. G.、Bagutskii, V. V.
DOI:——
日期:——
Total synthesis of epothilone D by sixfold ring cleavage of cyclopropanol intermediates
作者:Alaksiej L. Hurski、Oleg G. Kulinkovich
DOI:10.1016/j.tetlet.2010.04.109
日期:2010.7
The ring-opening or ring fragmentation reactions of cyclopropanol intermediates are used in the total synthesis of epothilone D for the creation of trisubstituted double bonds, an ethyl ketone functionality, as well as for the protection of carboxylic and ester groups. Epothilone D is obtained in 1.6% overall yield (24 steps in the longest linear sequence) starting from (R)-methyl 2,3-O-isopropylideneglycerate