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
Nucleophile-Assisted Alkene Activation: Olefins Alone Are Often Incompetent
作者:Kumar Dilip Ashtekar、Mathew Vetticatt、Roozbeh Yousefi、James E. Jackson、Babak Borhan
DOI:10.1021/jacs.6b02877
日期:2016.7.6
strategies for design of new reactions. Alkene reactivity is seen to span the range from the often overgeneralized "sophomore textbook" image of stepwise electrophilic attack on the alkene and subsequent nucleophilic bond formation, to the nucleophile-assisted alkene activation (NAAA) cases where electron donation from the nucleophilic addition partner activates the alkene for electrophilic attack. By highlighting
Regioselective Transfer Hydrodeuteration of Alkenes with a Hydrogen Deuteride Surrogate Using B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> Catalysis
作者:Johannes C. L. Walker、Martin Oestreich
DOI:10.1021/acs.orglett.8b02718
日期:2018.10.19
4-dienes as surrogates for hydrogen deuteride (HD) gas is reported. The metal-free process proceeds under B(C6F5)3 catalysis presumably by deuteride abstraction to form borodeuteride [DB(C6F5)3]− and highly Brønsted-acidic Wheland intermediates. Low catalyst loadings (2.5 mol %) are used, and the reaction proceeds at room temperature.
据报道,使用单氘代环己-1,4-二烯作为氘代氢(HD)气体的替代物,对烯烃进行区域选择性加氢氘代。无金属过程可能在B(C 6 F 5)3催化下进行,可能是通过氘代抽提而形成的硼氢化氘[DB(C 6 F 5)3 ] -和高度布朗斯台德酸性Wheland中间体。使用低催化剂负载量(2.5mol%),并且反应在室温下进行。
Conversion of 1,4-Dihydrobenzoic Acids to Polyformylbenzenes under Vilsmeier Reaction Conditions
作者:B. Raju、G. S. Krishna Rao
DOI:10.1055/s-1987-27890
日期:——
1,4-Dihydrobenzoic acids 1a-e are converted by a one-pot reaction to benzene- mono-, di- and tricarboxaldehydes under Vilsmeier reaction conditions in yields ranging from 6 to 65%. The same methodology also serves to give naphthalene-1,3-dicarboxaldehyde (2f) from 1,4-dihydro-1-naphthoic acid (1f) in 91% yield.
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