Easy entry to donor/acceptor butadiene dyes through a MW-assisted InCl3-catalyzed coupling of propargylic alcohols with indan-1,3-dione in water
作者:Javier Francos、Javier Borge、Josefina Díez、Sergio E. García-Garrido、Victorio Cadierno
DOI:10.1016/j.catcom.2014.07.028
日期:2015.3
In this contribution, the high-yield preparation and optical properties of some donor-acceptor butadiene dyes, generated by coupling of different 1,1-diaryl-2-propyn-1-ols with indan-1,3-dione, are presented. The reactions, which involve the initial Meyer–Schuster rearrangement of the aromatic alkynols and subsequent condensation of the resulting enals with the β-dicarbonyl compound, proceeded cleanly
<i>cis</i>-Selective, Enantiospecific Addition of Donor–Acceptor Cyclopropanes to Activated Alkenes: An Iodination/Michael-Cyclization Cascade
作者:Nils L. Ahlburg、Peter G. Jones、Daniel B. Werz
DOI:10.1021/acs.orglett.0c02210
日期:2020.8.21
biologically interesting scaffolds, including barbiturates and isoxazolones. Mechanistic investigations were undertaken to explain the unusual diastereoselectivity and enantiospecificity; these suggest an iodination/Michael-cyclization cascade.
Diversity‐Oriented Synthesis of Spirocyclohexene Indane‐1,3‐diones and Coumarin‐Fused Cyclopentanes via an Organobase‐Controlled Cascade Reaction
作者:Min Wang、Ping‐Yao Tseng、Woei‐Jye Chi、Sundaram Suresh、Athukuri Edukondalu、Yi‐Ru Chen、Wenwei Lin
DOI:10.1002/adsc.202000597
日期:2020.8.19
An organobase‐controlled, divergent cascade reaction to construct spirocyclohexene indane‐1,3‐diones and coumarin‐fused cyclopentanes is reported. The cascade reaction is triggered by the 1,6‐addition of 3‐homoacylcoumarins to the indanedione‐derived acceptors and further regio/chemoselective reaction that preferentially resulted in spiro systems and fused cyclopentanes in a diversity‐oriented manner
cycloadditions, and the utilization of their recently realized reactivities to construct new cyclic architectures is of great significance in modern synthetic chemistry. Herein, a palladium‐catalyzed, visible‐light‐driven, asymmetric [5+2] cycloaddition of VCPs with α‐diazoketones is accomplished by switching the reactivity of the Pd‐containing dipolar intermediate from an all‐carbon 1,3‐dipole to an oxo‐1
the chemo‐ and diastereoselectivity, divergently, of a reaction is highly attractive but extremely challenging. Presented herein is a catalyst‐controlled switch in the chemo‐ and diastereodivergent annulation reactions of Morita–Baylis–Hillmancarbonates, derived from isatins and 2‐alkylidene‐1H‐indene‐1,3(2H)‐diones, in exclusive α‐regioselectivity. α‐Isocupreine efficiently catalyzed [2+1] reactions