Synthesen makrocyclischer Lactone durch Ringerweiterung Herstellung von (±)-Phoracantholid I, (±)-Dihydrorecifeiolid und (±)-15-Hexadecanolid
作者:Kalina Kostava、Manfred Hesse
DOI:10.1002/hlca.19840670708
日期:1984.11.7
Syntheses of Macrocyclic Lactones by Ring Enlargement Reaction Reaction. Preparation of (±)-Phoracantholide I, (±)-Dihydrorecifeiolide and (±)-15-Hexadecanolide
The invention relates to a new strain of
Pseudomonas putida
(designated as HI-70) and to the isolation, cloning, and sequencing of a cyclododecanone monooxygenase-encoding gene (named cdnB) from said strain. The invention also relates to a new cyclododecanone monooxygenase and to a method of use of the cyclododecanone monooxygenase-encoding gene.
Studies on the Transesterification and Macrolactonization of 2-Pyridyl Esters by Intramolecular N-Alkylation or Metal Ion Coordination
作者:Anthony G. Barrett、Mathias U. Frederiksen
DOI:10.1055/s-2005-918476
日期:——
In a process analogous to use of the Mukaiyama reagent, Ï-hydroxyalkyl 2-pyridyl ester derivatives were converted into lactones by N-alkylation or the coordination of copper(II) triflate and transacylation of the resultant electrophilic Ï-hydroxyalkanecarboxypyridinium salts.
The invention relates to a method for producing cyclic esters of general formula (I.a) or (I.b) in the presence of at least one high-boiling metal alkoxide catalyst. The invention further relates to the stereoisomers of 18-methyl-1-oxacyclooctadec-10-en-2-one and to the use thereof as an odorous substance and/or flavoring substance, to compositions that contain at least one of the stereoisomers of 18-methyl-1-oxacyclooctadec-10-en-2-one and additionally a carrier material, to fragrance compositions and/or to fragrant-substance materials that contain at least one of these compounds, and to a method for giving an odor or flavor to or changing an odor or flavor of compositions by adding at least one of the mentioned compounds to said compositions.
Removable Silyl Group as a “Masked Proton” in Oxy-2-oxonia(azonia)-Cope Rearrangement: Applications in Stereoselective Total Synthesis of Natural Macrolides
In the presence of a Lewis acid, trimethylsilyl-substituted β,γ-unsaturated ketones and aldehydes (imines) undergo nucleophilic addition to produce zwitterionic intermediates, followed by oxy-2-oxonia(azonia)-Cope rearrangements to give homoallylic esters (amides). In the case of TMS-containing 2-vinylcycloalkanones, the process results in ring-enlargement, providing 10- to 16-membered lactones. This