A Highly Nucleophilic Multifunctional Chiral Phosphane-Catalyzed Asymmetric Intramolecular Rauhut-Currier Reaction
作者:Xiao-Nan Zhang、Min Shi
DOI:10.1002/ejoc.201200940
日期:2012.11
An asymmetric variant of the intramolecularRauhut–Currier (RC) reaction can be achieved using a highlynucleophilicmultifunctionalchiral phosphane; the corresponding cyclopentene and cyclohexene derivatives are produced in moderate to good yields and with good to excellent enantioselectivities.
intramolecular Rauhut–Currier reaction of linear bis(enones) has been achieved via double activation catalysis of thiols and phase transfer substances, furnishing both enantioenriched cyclohexene and cyclopentene derivatives (up to 95% ee). Furthermore, the desymmetric version of prochiral substrates was developed under similar catalysis, producing the frameworks bearing an additional tertiary or even quaternary
Electrochemically initiated, intramolecular anionradical cyclobutanations of bis(enones) and related substrates are presented. The formation of novel anionradical Diels–Alder adducts in minor amounts is also observed. Total yields of pericyclic products, which include both cis- and trans-cyclobutanes and a single Diels–Alder adduct, are generally high (51–88%), with electrocatalytic factors in the
Anion Radical [2 + 2] Cycloaddition as a Mechanistic Probe: Stoichiometry- and Concentration-Dependent Partitioning of Electron-Transfer and Alkylation Pathways in the Reaction of the Gilman Reagent Me<sub>2</sub>CuLi·LiI with Bis(enones)
作者:Jingkui Yang、David F. Cauble、Adam J. Berro、Nathan L. Bauld、Michael J. Krische
DOI:10.1021/jo048499t
日期:2004.11.1
species present at higher concentration induce Gilman alkylation en route to products 2a−2e, the species present at lower concentration provide products of catalytic [2 + 2] cycloaddition, 3a−3e. Moreover, upon electrochemical reduction of the bis(enones) 1a−1e, or chemically induced single-electron transfer from arene anion radicals, the very same [2 + 2] cycloadducts 3a−3e are formed. The collective data
Stereoselective Borylcupration/Michael Addition on Symmetrical Dienones
作者:Laxman Devidas Khalse、Prasanta Ghorai
DOI:10.1021/acs.joc.2c02714
日期:2023.7.7
An efficient cascade protocol for the stereoselective synthesis of borylated carbocycles via copper-catalyzed borylative Michael/Michael cyclization is presented. Using this mild approach, up to 24 new boronic ester substituted indanes, cyclohexanes, and cyclopentanes were prepared in good yields with excellent diasteroselectivities and exceptional functional group tolerance. Furthermore, carbacyclic