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Displaying article 1-7
Published: 20 January 2000
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| Download PDF Full-text (13 KB) Abstract: n/a
p. 1-12
Received: 3 November 2000 / Accepted: 6 November 2000 / Published: 22 December 2000
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| Download PDF Full-text (105 KB) 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 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.
p. 13-20
Received: 24 July 2000; in revised form: 18 December 2000 / Accepted: 18 December 2000 / Published: 16 January 2001
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| Download PDF Full-text (82 KB) 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.
p. 21-46
Received: 20 October 2000; in revised form: 20 December 2000 / Accepted: 20 December 2000 / Published: 16 January 2001
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| Download PDF Full-text (272 KB) 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.
p. 47-51
Received: 14 May 2000; in revised form: 20 December 2000 / Accepted: 20 December 2000 / Published: 16 January 2001
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| Download PDF Full-text (40 KB) 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.
p. 52-60
Received: 30 September 1998; in revised form: 4 September 2000 / Accepted: 19 September 2000 / Published: 16 January 2001
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| Download PDF Full-text (106 KB) 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 to proceed via the ene reaction of singlet oxygen and subsequent rearrangement of the initially formed 5a-hydroperoxides.
p. 61-66
Received: 6 December 2000; in revised form: 7 January 2001 / Accepted: 8 January 2001 / Published: 16 January 2001
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| Download PDF Full-text (78 KB) 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.
Displaying article 1-7
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