A synthetic study of briarane-type marine diterpenoid, pachyclavulide B
摘要:
Enantioselective preparation of the six-membered ring of pachyclavulide B, a briarane-type diterpenoid, was achieved. The key step is desymmetrization of an achiral symmetric substrate by enantiogroup- and diastereoselective epoxidation. The asymmetric epoxidation proceeded with up to 99% de and 94% ee. (c) 2005 Elsevier Ltd. All rights reserved.
Scalable and safe synthetic organic electroreduction inspired by Li-ion battery chemistry
作者:Byron K. Peters、Kevin X. Rodriguez、Solomon H. Reisberg、Sebastian B. Beil、David P. Hickey、Yu Kawamata、Michael Collins、Jeremy Starr、Longrui Chen、Sagar Udyavara、Kevin Klunder、Timothy J. Gorey、Scott L. Anderson、Matthew Neurock、Shelley D. Minteer、Phil S. Baran
DOI:10.1126/science.aav5606
日期:2019.2.22
Scaled-up sodium-free Birchreductions The so-called Birchreduction is frequently used by chemists despite its daunting conditions: Pyrophoric sodium is dissolved in pure liquified ammonia to achieve partial reduction of aromatics. Peters et al. surveyed and then optimized small-scale electrochemical alternatives to devise a safer protocol that can work on a larger scale with a broad range of functionally
Enantio- and Regioselective Ir-Catalyzed Hydrogenation of Di- and Trisubstituted Cycloalkenes
作者:Byron K. Peters、Jianguo Liu、Cristiana Margarita、Wangchuk Rabten、Sutthichat Kerdphon、Alexander Orebom、Thomas Morsch、Pher G. Andersson
DOI:10.1021/jacs.6b07291
日期:2016.9.14
carbons away from the olefin. Substrates having functionalities such as carboxyl groups, alcohols, or heterocycles in the vicinity of the C═C bond were hydrogenated in high enantiomeric excess (up to >99% ee). The hydrogenation was also found to be regioselective, and by controlling the reaction conditions, selective hydrogenation of one of two trisubstituted olefins can be achieved. Furthermore, trisubstituted
Non-Cryogenic, Ammonia-Free Reduction of Aryl Compounds
申请人:University of Pittsburgh - Of the Commonwealth System of Higher Education
公开号:US20220089508A1
公开(公告)日:2022-03-24
A method of reducing an aromatic ring or a cyclic, allylic ether in a compound includes preparing a reaction mixture including a compound including an aromatic moiety or a cyclic, allylic ether moiety, an alkali metal, and either ethylenediamine, diethylenetriamine, triethylenetetramine, or a combination thereof, in an ether solvent; and reacting the reaction mixture at from −20° C. to 30° C. for a time sufficient to reduce a double bond in the aromatic moiety to a single bond or to reduce the cyclic, allylic ether moiety.
Synthesis of γ‐Spirolactams by Birch Reduction of Arenes
作者:Tobias Krüger、Torsten Linker
DOI:10.1002/ejoc.202100056
日期:2021.3.12
Birchreduction of arene carboxylic acids in the presence of chloroacetonitrile affords nitriles and their subsequent catalytic hydrogenation γ‐spirolactams in only 3 steps with excellent stereoselectivities. It is possible to control the degree of saturation by variation of the catalyst at different pressures. Thus, more than 15 new γ‐spirolactams have been synthesized from inexpensive starting materials
Enantioselective preparation of the six-membered ring of pachyclavulide B, a briarane-type diterpenoid, was achieved. The key step is desymmetrization of an achiral symmetric substrate by enantiogroup- and diastereoselective epoxidation. The asymmetric epoxidation proceeded with up to 99% de and 94% ee. (c) 2005 Elsevier Ltd. All rights reserved.