Asymmetric Dehydrative Cyclization of ω-Hydroxy Allyl Alcohols Catalyzed by Ruthenium Complexes
作者:Shinji Tanaka、Tomoaki Seki、Masato Kitamura
DOI:10.1002/anie.200904671
日期:2009.11.9
New axially chiral ligands and their allyl esters have been designed and synthesized. The combination of these ligands with [CpRu(CH3CN)3]PF6 has realized highly efficient intramolecular dehydrative cylization of ω‐hydroxy allylalcohols, to give α‐alkenyl‐substituted cyclic ethers with up to greater than 99:1 enantiomeric ratio without activation of the allylic moieties (see scheme; Cp=cyclopentadienyl
作者:Mulzer, Johann、Bock, Harald、Eck, Wolfgang、Buschmann, Juergen、Luger, Peter
DOI:——
日期:——
Toward the Macrocidins: Macrocyclization via Williamson Etherification of a Phenolate
作者:Bertram Barnickel、Rainer Schobert
DOI:10.1021/jo101416x
日期:2010.10.1
The synthesis of macrocyclic 3-acyltetramic acids which are immediate precursors of the fungal herbicide macro-cidin A (1) is reported. The crucial closure of the macrocycle was achieved in excellent yield by an unprecedented Williamson etherification of an omega-bromo phenolate generated in situ by a Pd-mediated O-deallylation.
LITTLE, R. DANIEL;FOX, DENNIS P.;HIJFTE, LUC VAN;DANNECKER, ROBERT;SOWELL+, J. ORG. CHEM., 53,(1988) N 10, 2287-2294
作者:LITTLE, R. DANIEL、FOX, DENNIS P.、HIJFTE, LUC VAN、DANNECKER, ROBERT、SOWELL+
DOI:——
日期:——
NOUVEAU PROCEDE DE PREPARATION D'HYDROXY-ACIDES GRAS INSATURES