One-Pot Cannizzaro Cascade Synthesis of <i>ortho</i>
-Fused Cycloocta-2,5-dien-1-ones from 2-Bromo(hetero)aryl Aldehydes
作者:Laurence Burroughs、Lee Eccleshare、John Ritchie、Omkar Kulkarni、Barry Lygo、Simon Woodward、William Lewis
DOI:10.1002/anie.201505347
日期:2015.9.1
An intramolecular Cannizzaro‐type hydride transfer to an in situ prepared allene enables the synthesis of ortho‐fused 4‐substituted cycloocta‐2,5‐dien‐1‐ones with unprecedented technical ease for an eight‐ring carboannulation. Various derivatives could be obtained from commercially available (hetero)arylaldehydes, trimethylsilylacetylene, and simple propargyl chlorides in good yields.
[EN] SYNTHESIS OF DEUTERATED ALDEHYDES<br/>[FR] SYNTHÈSE D'ALDÉHYDES DEUTÉRÉS
申请人:UNIV ARIZONA
公开号:WO2021045879A1
公开(公告)日:2021-03-11
Described are methods for preparing a deuterated aldehyde using N-heterocyclic carbene catalysts in a solvent comprising D2O. The methods may be used to convert a wide variety of aldehydes (e.g., aryl, alkyl, or alkenyl aldehydes) to C-1 deuterated aldehydes under mild reaction conditions without functionality manipulation.
Domino C–H functionalization reactions of gem-dibromoolefins: synthesis of N-fused benzo[c]carbazoles
作者:Richard Y. Huang、Patrick T. Franke、Norman Nicolaus、Mark Lautens
DOI:10.1016/j.tet.2013.01.001
日期:2013.6
A palladium-catalyzed domino transformation of gem-dibromoolefins leading to novel polycyclic benzo[c]carbazoles is described. A unique feature of the current reaction is the participation of both bromides in C–H functionalization processes. Mechanistic studies were conducted to ascertain the sequence of reaction events, and the results indicate that the (Z)-bromide likely reacts in preference to the
描述了钯-催化的宝石-二溴烯烃的多米诺转化,其导致了新型的多环苯并[ c ]咔唑。当前反应的一个独特特征是两种溴化物都参与了CH的H官能化过程。进行了机理研究以确定反应事件的顺序,结果表明(Z)-溴化物可能优先于(E)-溴化物反应。
One-Pot Synthesis of Deuterated Aldehydes from Arylmethyl Halides
A facile, one-pot approach for synthesizing deuterated aldehydes from arylmethyl halides was developed using D2O as the deuterium source. The efficient process is realized by a sequence of formation, H/D exchange, and oxidation of pyridinium salt intermediates. The mild and air-compatible reaction conditions enable efficient synthesis of diverse deuterated aldehydes with high deuterium incorporation
N-Heterocyclic Carbene Catalyzed Deuteration of Aldehydes in D2O
作者:Yoshinari Sawama、Yuya Miki、Hironao Sajiki
DOI:10.1055/s-0040-1707993
日期:2020.4
An N-heterocycliccarbene (NHC)-catalyzed direct deuteration of aldehydes in a mixed solvent of deuterium oxide (D2O) and cyclopentyl methyl ether was established. The present deuteration is possibly initiated by the formation of a Breslow intermediate from the aldehyde and the NHC, with subsequent trapping by D2O providing the monodeuterated aldehyde.