16354-91-9Relevant articles and documents
Preparation of chiral sugar-derived fluorides using new nucleophilic fluorinating reagents
Bilska-Markowska, Monika,Koroniak, Henryk
, p. 185 - 192 (2017/09/18)
New fluorinating reagents, composed of (S)-2-(diphenylmethyl)pyrrolidine and 1,1,3,3,3-pentafluoropropene/hexafluoropropene, have been found to be an effective system for nucleophilic deoxyfluorination. Regio- and stereoselectivity of deoxyfluorination of sugar-derived allylic, benzylic and propargylic alcohols with new reagents have been studied.
Further uses of pyrrole-based dienoxysilane synthons: A full aldol approach to azabicyclo[x.2.1]alkane systems
Zanardi, Franca,Curti, Claudio,Sartori, Andrea,Rassu, Gloria,Roggio, Annamaria,Battistini, Lucia,Burreddu, Paola,Pinna, Luigi,Pelosi, Giorgio,Casiraghi, Giovanni
experimental part, p. 2273 - 2287 (2009/04/05)
Two racemic 2-azabicyclo[2.2.1]heptane structures, 15 and 21, and two chiral non-racemic 6-azabicyclo[3.2.1]octane representatives, 28 and 36, have been synthesized starting from 1-(tert-butoxycarbonyl)-2-(tert- butyldimethylsilyloxy)-pyrrole (TBSOP, 5) and suitable ketones, 9, 16, 22 and 29. 2-Azabicycle 15 was then elaborated to racemic cyclopentane amino acid 38, while 6-azabicycle 36 served to access the enantiomerically pure normorphan-type structure 40. For all substrates, a uniform synthetic scheme was implemented based on the combination of two diastereoselective aldol-type carbon-carbon bond-forming reactions, the efficiencies of which were secured by appropriate aldol-stabilizing steps. A mechanistic rationale accounting for the markedly diastereoselective character of the key Mukaiyama aldol reactions between TBSOP and the ketone acceptors has been postulated that involves hetero-Diels-Alder transition-state structures in which the preference for endo versus exo addition is governed by the electronic nature of the substituents in the ketone substrates. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
Comparison of Stereoselectivity of Intramolecular Cyclization of Aldehydes Tethered with Conjugated Esters Induced by O-Stannyl and O-Samarium Ketyls to Form the Tetrahydrofuran Ring Systems
Hon, Yung-Son,Sun, Pei-Pei,Lu, Hui-Ling,Chang, Nein-Chen
, p. 445 - 458 (2007/10/03)
Several (E)- and (Z)-ω-formyl-5-oxa-2-substituted-α,β-unsaturated esters (6Za-6Zc; 6Ea-6Ec; 6Eb'-6Ec'; 6Zb'-6Zc') were prepared in high yields.They were subjected to cyclization of their intramolecular ketyl radicals induced by either samarium(II) iodide
Stereoselectivity syn-Reduction of (R)-4-Acyl-2,2-dimethyl-1,3-dioxolanes with Metal Hydride Reagents
Chikashita, Hidenori,Nikaya, Toshiki,Uemura, Hiromitsu,Itoh, Kazuyoshi
, p. 2121 - 2123 (2007/10/02)
Lithium tri-s-butylborohydride and lithium aluminum hydride were found to be efficient reducing agents for the stereoselective preparation of syn-glycerol derivatives from (R)-4-acyl-2,2-dimethyl-1,3-dioxolanes.The scope and limitation of the stereoselect
ON THE STERIC COURSE OF THE ADDITION OF SOME ORGANOMETALLIC REAGENTS TO (R)-2,3-ISOPROPYLIDENE GLYCERALDEHYDE. SYNTHESIS OF OPTICALLY ACTIVE α-BENZYLOXY ALDEHYDES, ALCOHOLS, CARBOXYLIC ACIDS AND 1,2-DIOLS.
Mulzer, Johann,Angermann, Alfred
, p. 2843 - 2846 (2007/10/02)
Organo-titanium and organo-zinc reagents were added stereoselectively to (R)-2,3-isopropylidene glyceraldehyde (1) to give the alcohols 2/3, which were converted into the optically active derivatives 4-11.