Biocatalytic access to nonracemic γ-oxo esters via stereoselective reduction using ene-reductases
作者:Nikolaus G. Turrini、Răzvan C. Cioc、Daan J. H. van der Niet、Eelco Ruijter、Romano V. A. Orru、Mélanie Hall、Kurt Faber
DOI:10.1039/c6gc02493a
日期:——
The asymmetric bioreduction of [small alpha],[small beta]-unsaturated [gamma]-keto esters usingene-reductasesfrom the OldYellowEnzymefamily proceeds with excellent stereoselectivity and high conversion levels, covering a broad range of acyclic and...
Rearrangement of 1-(1-Alkynyl)cyclopropanols to 2-Cyclopentenones via Their Hexacarbonyldicobalt Complexes. A New Use of Alkyne−Co<sub>2</sub>(CO)<sub>6</sub> Complexes in Organic Synthesis
protective group of the substrates. This rearrangement was successfully applied to cyclopentenone annulation reactions onto cycloalkenes. An efficient synthesis of alkynyl-substituted bicyclo[n.1.0]alkanol derivativesfrom the corresponding cycloalkenes according to Danheiser's protocol was developed, and bicyclic cyclopentenones were obtained in moderate to good yield by applying to these the cobalt-mediated
1-(1-炔基) 环丙醇向 2-环戊烯-1-酮的新重排是在其炔基部分与八羰基二钴 (Co2(CO8)) 络合后进行的。1-(1-炔基) 环丙醇在其炔烃末端具有广泛的取代基,以良好的产率重排为相应的 3-取代的 2-环戊烯-1-酮。In case of the reactions of 1-alkynylcyclopropanols with an alkyl substituent on the cyclopropane ring, either 4-substituted or 5-substituted 2-cyclopenten-1-ones could be selectively obtained by appropriate choice of stereochemistry and protective group of the substrates. 这种重排成功地应用于环戊烯酮环化成环烯烃的反应。根据
Synthesis of the both enantiomers of grandisol, the boll weevil pheromone
作者:K. Mori
DOI:10.1016/0040-4020(78)88139-3
日期:1978.1
Opticallyactive forms of grandisol (2-isopropenyl-1-methylcyclobutane ethanol, 1 and 1') were synthesized from opticallyactive 5-carboxybicyclo[3.2.0]heptan-2-one (2 and its antipode), obtained by resolving the racemate. The optical purities of the synthetic products were determined by the NMR studies using a chiral shift reagent and shown to be 80%. The [α]D values of our synthetic grandisols were
Biocatalytic synthesis of chiral cyclic γ-oxoesters by sequential C–H hydroxylation, alcohol oxidation and alkene reduction
作者:Elisabetta Brenna、Michele Crotti、Francesco G. Gatti、Daniela Monti、Fabio Parmeggiani、Andrea Pugliese、Francesca Tentori
DOI:10.1039/c7gc02215h
日期:——
chiral 3-oxoesters, which are useful building blocks for the synthesis of active pharmaceutical ingredients. The allylic hydroxylation of the starting cycloalkenecarboxylates is carried out by using R. oryzae resting cells entrapped in alginate beads, in acetate buffer solution at 25 °C. The oxidation of the intermediate allylic alcohols to unsaturated ketones, performed by the laccase/TEMPO system