Mapping of the functional active site of Baeyer–Villigerases by substrate engineering
摘要:
An active site model for enzyme catalysed BaeyerâVilliger reactions is proposed and validated by transformation of the tricyclic ketone 6; BaeyerâVilliger reactions (and BaeyerâVilligerases) are classified by the stereochemistry of the hydroxyperoxide intermediate.
Planarisierung von tetrakoordiniertem Kohlenstoffatom. Synthese des überbrückten all-<i>cis</i>-[5.5.5.5]Fenestrans 13-Oxapentacyclo[5.5.2.1<sup>1.7</sup>.0<sup>4,15</sup>.0<sup>10,15</sup>] pentadecan-14-on
作者:Armin Pfenninger、Alex Roesle、Reinhart Keese
DOI:10.1002/hlca.19850680223
日期:1985.3.27
Planarisation of Tetracoordinate Carbon Atom, Synthesis of the Brigded all-cis-[5.5.5.5]Fenestrane 13-Oxapentacyclo[5.5.2.11,7.04,15.010,15]pentadecan-14-one
palladium(II) 2-(phosphinophenyl)pyridine (1a) complex was found to be an effective catalyst for asymmetricBaeyer-Villigeroxidation of prochiral cyclobutanones. For example, good and excellent enantioselectivities (80% and >99% ees) were achieved in the reactions of 3-phenylcyclobutanone and a tricyclic cyclobutanone, respectively.
The synthesis of functionalized cis'-bicyclo ¦3.3.0¦octanes
作者:Paul Callant、Hugo De Wilde、Maurits Vandewalle
DOI:10.1016/s0040-4020(01)97961-x
日期:1981.1
A number of polyfunctionalized cis-bicycio ¦3.3.0¦octanes have been synthesized starting from the tricyclic key intermediate which was obtained by the intramolecular cyclopropanation reaction of the diazo keto ester . Selected stereocontrolled transformations of using nucleophiles and electrophiles have been studied for the preparation of the title compounds.
(R,R)-Zr(salen) complex was found to serve as an efficient catalyst for asymmetric Baeyer–Villiger oxidation of pro-chiral and racemic ketones using urea·hydrogen peroxide as the terminal oxidant: for example, high enantioselectivity of 87% ee was achieved in the Baeyer–Villiger reaction of 3-phenylcyclobutanone.
8-diene-3/gb-ol, which has previously been resolved, a series of transformations are described which provide access to a variety of chiral intermediates for the synthesis of carbaprostacyclin and prostaglandin derivatives. Amongst these precursors are 8-acetoxybicyclo[3.3.0]oct-2-ene, 8-acetoxybicyclo[3.3.0]octane-2-carboxaldehyde and a deoxyCorey lactone derivative.