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Molecules, Volume 6, Issue 1 (January 2001) – 7 articles , Pages 1-66, Article 601000

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78 KiB  
Article
Cohalogenation of Allyl and Vinylsilanes using Polymer-bound Haloate(I)-Reagents
by Silvie Domann, Georgia Sourkouni-Argirusi, Nuria Merayo, Andreas Schönberger and Andreas Kirschning
Molecules 2001, 6(1), 61-66; https://doi.org/10.3390/60100061 - 16 Jan 2001
Cited by 6 | Viewed by 7059
Abstract
Polymer-supported electrophilic halogenate(I) complexes 2 and 3 promote smooth addition to vinyl and allylsilanes without loss of the silyl group. In conjunction with Amberlyst A26 (OH -form) vinyl silanes are converted into epoxysilanes. Full article
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106 KiB  
Article
Sensitized Photooxygenation of Cholesterol and Pseudocholesterol Derivatives via Singlet Oxygen
by Wu Shuping, Jiang Zhiqin, Li Heting, Yang Li and Zeng Daixun
Molecules 2001, 6(1), 52-60; https://doi.org/10.3390/60100052 - 16 Jan 2001
Cited by 11 | Viewed by 7511
Abstract
3-Substituted cholesterols and 7-substituted pseudocholesterols undergo a facile photooxygenation sensitized by 9, 10-dicyanoanthracene (DCA) and lumiflavin (LF) to give similar, oppositely-positioned enol derivatives. Both steroids showed the same reaction pattern associated with the endocyclic 5- and 4-olefin units, respectively. The reaction was proposed [...] Read more.
3-Substituted cholesterols and 7-substituted pseudocholesterols undergo a facile photooxygenation sensitized by 9, 10-dicyanoanthracene (DCA) and lumiflavin (LF) to give similar, oppositely-positioned enol derivatives. Both steroids showed the same reaction pattern associated with the endocyclic 5- and 4-olefin units, respectively. The reaction was proposed to proceed via the ene reaction of singlet oxygen and subsequent rearrangement of the initially formed 5a-hydroperoxides. Full article
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40 KiB  
Article
A Simple Method for Synthesis of Active Esters of Isonicotinic and Picolinic Acids
by Jørn B. Christensen
Molecules 2001, 6(1), 47-51; https://doi.org/10.3390/60100047 - 16 Jan 2001
Cited by 25 | Viewed by 11040
Abstract
A method for preparation of the p-nitrophenyl-, N-hydroxysuccinimidyl- and pentafluorophenyl esters of isonicotinic and picolinic acids from the corresponding acids is reported. Full article
272 KiB  
Review
Bile Acids as Building Blocks of Supramolecular Hosts
by Jari Tamminen and Erkki Kolehmainen
Molecules 2001, 6(1), 21-46; https://doi.org/10.3390/60100021 - 16 Jan 2001
Cited by 179 | Viewed by 12641
Abstract
A review of the use of bile acid-based compounds as building blocks for designing novel supramolecular hosts for molecular recognition is presented. Pharmacological applications and the newest spectroscopic and computational studies of bile acid derivatives are also shortly considered. Full article
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82 KiB  
Article
Tricarbonyl(h6-Arene)Chromium(0) Complexes as Chiral Auxiliaries: Asymmetric Synthesis of b-Lactones
by Paola Del Buttero and Deborah Montrasio
Molecules 2001, 6(1), 13-20; https://doi.org/10.3390/60100013 - 16 Jan 2001
Cited by 4 | Viewed by 6941
Abstract
The optically pure tricarbonyl(h6-2-substituted benzaldehydes)chromium are used as chiral auxiliaries in the condensation with a series of doubly lithiated carboxylic acids. The intramolecular ring closure of the obtained Cr(CO)3 complexed b-hydroxyacids affords the optically pure b-lactones in satisfactory yield. Full article
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105 KiB  
Review
Synthesis of Polycyclic Ring Systems Using Transition Metal Catalyzed Cyclizations of Diazo Alkynyl Ketones
by Albert Padwa
Molecules 2001, 6(1), 1-12; https://doi.org/10.3390/60100001 - 22 Dec 2000
Cited by 26 | Viewed by 9231
Abstract
The rhodium(II)-catalyzed reaction of α-diazo ketones bearing tethered alkyne units represents a new and useful method for the construction of a variety of substituted cyclopentenones. The process proceeds by addition of the rhodium-stabilized carbenoid onto the acetylenic π-bond to give a vinyl carbenoid [...] Read more.
The rhodium(II)-catalyzed reaction of α-diazo ketones bearing tethered alkyne units represents a new and useful method for the construction of a variety of substituted cyclopentenones. The process proceeds by addition of the rhodium-stabilized carbenoid onto the acetylenic π-bond to give a vinyl carbenoid intermediate. The resulting rhodium complex undergoes a wide assortment of reactions including cyclopropanation, 1,2-hydrogen migration, CH-insertion, addition to tethered alkynes and ylide formation. When 2-alkynyl-2-diazo-3-oxobutanoates were treated with a Rh(II)-catalyst, furo[3,4-c]furans were formed in excellent yield. Full article
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13 KiB  
Editorial
Invitation: High Quality Papers with Extensive Literature Review and Full Experimental Details
by Derek J. McPhee and Shu-Kun Lin
Molecules 2001, 6(1), 601000; https://doi.org/10.3390/6010000i - 20 Jan 2000
Cited by 2 | Viewed by 2691
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