Ag(I)-Catalyzed Kinetic Resolution of Cyclopentene-1,3-diones
作者:Hua-Chao Liu、Liang Wei、Rong Huang、Hai-Yan Tao、Hengjiang Cong、Chun-Jiang Wang
DOI:10.1021/acs.orglett.8b01254
日期:2018.6.15
Ag(I)-catalyzed asymmetric 1,3-dipolarcycloaddition of azomethineylides. This methodology shows good functional-group tolerance, delivering an array of synthetically valuable cyclopentene-1,3-diones with excellent stereoselectivity and generally high resolution efficiency (s = 48–226) accompanied by the biologically important fused pyrrolidinederivatives. Notably, this strategy allows facile access to the key
Efficient photochemical transformation of spiro[4.n]-2,5-diones to γ-alkylidene γ-butyrolactones: its relevance to photostability of Fredericamycin A
作者:Bipin Pandey、Ravinder S. Reddy、Pradeep Kumar
DOI:10.1039/c39930000870
日期:——
Irradiation of a variety of model spirodiones related to the antitumour antibiotic Fredericamycin A in various solvents at 300 nm furnishes quantitative yields of γ-alkylidene γ-butyrolactones; its relevance to the typical shape alteration, photostability and consequent biological response of Fredericamycin is discussed.
Model studies aimed at the synthesis of Fredericamycin A. A simple o-quinodimethane route to the spiro naphthalene portion
作者:Robert D. Bach、Russell C. Klix
DOI:10.1016/s0040-4039(00)84427-5
日期:1986.1
The three contiguous rings in the naphthalene portion of a model compound related to Fredericamycin A have been prepared by the Diels-Alder cycloaddition reaction of an α-bromo-o-quinodimethane intermediate to the carbon—carbon double bond of the spiro dienophile, spiro[4.4]non-2, 3-ene-1, 4-dione.
Lewis Acid Catalyzed Geminal Acylation Reaction of Ketones with 1,2-Bis[(trimethylsilyl)oxy]cyclobutene: Direct Formation of 2,2-Disubstituted 1,3-Cyclopentanediones
作者:Tracy J. Jenkins、D. Jean Burnell
DOI:10.1021/jo00085a041
日期:1994.3
Ketones reacted with 1,2-bis((trimethylsilyl)oxy)cyclobutene (1) under catalysis by boron trifluoride etherate to yield 2,2-disubstituted 1,3-cyclopentanedione products via silylated cyclobutanone intermediates in a two-step, one-pot process. In many instances addition of a small amount of water to the reaction medium after completion of the first step assisted the subsequent rearrangement to the product, such that reversion of the intermediate to the starting ketone became an insignificant process. Yields were best with cyclohexanones (>90%), but steric hindrance and conjugated double bonds reduced yields considerably.
Sudini; Khire; Pandey, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2000, vol. 39, # 10, p. 738 - 745