2006
Furan derivatives R 0060Asymmetric Dihydroxylation of β,γ-Unsaturated Carboxylic Esters with Trisubstituted C=C Bonds -Enantioselective Syntheses of Trisubstituted γ-Butyrolactones. -The starting β,γ-unsaturated esters are prepared as geometrically pure (E)and (Z)-isomers. Their Sharpless asymmetric dihydroxylation reactions are accompanied by spontaneous cyclization to provide β-hydroxy-γ-lactones in moderate to good yields and enantioselectivities. Two series are performed using either (DHQD) 2 -PHAL or (DHQ)2-PHAL. -(KAPFERER, T.; BRUECKNER*, R.; Eur. J. Org. Chem. 2006, 9, 2119-2133; Inst. Org. Chem. Biochem., Albert-Ludwigs-Univ., D-79104 Freiburg/ Br., Germany; Eng.) -Klein 33-124
Alkenes P 0023Stereoselective Preparation of (E)-α-Bromoacrylates from Mixtures of Brominated Ando Phosphonates. -Bromination of Ando phosphonate (I) results in mixtures of mono-and dibrominated phosphonates (II) and (III) which are used for E-selective formation of trisubstituted double bonds. -(OLPP, T.; BRUECKNER*, R.; Synthesis 2004, 13, 2135-2152; Inst. Org. Chem. Biochem., Albert-Ludwigs-Univ., D-79104 Freiburg/Br., Germany; Eng.) -Nuesgen 04-068
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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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