67279-69-0Relevant articles and documents
Optically pure γ-butyrolactones and epoxy esters via two stereocentered HKR of 3-substituted epoxy esters: A formal synthesis of (-)-paroxetine, Ro 67-8867 and (+)-eldanolide
Devalankar, Dattatray A.,Karabal, Pratibha U.,Sudalai, Arumugam
, p. 1280 - 1285 (2013/05/08)
The HKR of racemic anti- or syn-3-substituted epoxy esters catalyzed by a Co(iii)salen complex provides ready access to the corresponding enantioenriched 3,4-disubstituted γ-butyrolactones and 3-substituted epoxy esters. This strategy has been successfully employed in the formal synthesis of biologically active 3,4-disubstituted piperidine derivatives, (-)-paroxetine and Ro 67-8867 and a natural product, (+)-eldanolide.
Stereocontrolled iodolactonization of acyclic olefinic amides
Ha,Lee,Park
, p. 3645 - 3650 (2007/10/03)
Acyclic olefinic amides were iodolactonized in the mixed solvent of CH3CN and H2O (90:10, v/v) under reflux to give products with trans configuration of the newly formed iodomethyl to the inherent alkyl group in high yield.
Synthesis of 4-Penten-4-olides (γ-Methylene-γ-butyrolactones) via 4-Pentenoic Acids
Guenther, Hans Juergen,Guntrum, Eberhard,Jaeger, Volker
, p. 15 - 30 (2007/10/02)
4-Penten-4-olides (γ-Methylene-γ-butyrolactones) 7 are easily accessible starting from allylic alcohols 1, which on ortho ester Claisen rearrangement and hydrolytic work-up furnish 4-pentenoic acids 5.The latter on iodolactonization and hydrogen iodide elimination by means of 1,8-diazabicycloundec-7-ene (DBU) furnish 7, in good over-all yield and with variable substitution patterns. - Iodolactonization under kinetic control shows moderate 1,2- or 1,3-asymmetric induction (3:1 and ca. 2:1, respectively).The composition of the iodolactone mixtures 6 as well as the individual relative configurations are deduced from 1H and 13C NMR data. - Similary, the spirobipentenolide 13 is obtained starting from diethyl diallylmalonate (9) via 11 resulting from ester iodocyclization.