Attempted Resolution and Racemization of Beckmann-Derived CTV-Lactam and the Use of Chirabite-AR® to Determine the Optical Purity of the Supramolecular Scaffold
作者:Marlon R. Lutz、Elizabeth Ernst、Matthias Zeller、Jacob Dudzinski、Peter Thoresen、Daniel P. Becker
DOI:10.1002/ejoc.201800788
日期:2018.9.9
host compounds bearing three binaphthol moieties have been reported as chiral sensors with recognition of sugar derivatives.[14] The crown form of cyclotriveratrylene can undergo umbrella inversion that inverts chiral derivatives into their enantiomeric counterpart, as Collet demonstrated by observing the slow racemization of structurally chiral cyclotriveratrylene derivatives.[15] Resolution and NMR studies
prepared in an enantiomerically pure form by reduction of dl-ketone with respective (+)- and (−)-Darvon-LiAlH4 complex followed by purification with the aids of esterification with d- and l-menthoxyacetyl chlorides and (−)-camphanic acid chloride, respectively. Absoluteconfiguration of naturally occurring (+)-mayol and (+)-cembrenene was determined by correlation with enantiomerically pure compounds
Varma, Luxmi R; Narayanan, C S, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1991, vol. 30, # 7, p. 676 - 680
作者:Varma, Luxmi R、Narayanan, C S
DOI:——
日期:——
——
作者:M. P. Doyle、D. J. Timmons、M. M. R. Arndt、A. Duursma、J. T. Colyer、H. Brünner
DOI:10.1023/a:1015061620557
日期:——
Chiral attachments on 2-oxoimidazolidine-4(S)-carboxylate ligands for dirhodium(11) can provide differential diastereoselection in catalytic reactions of diazo compounds. The synthesis of these heterocyclic ligands from the readily available amino acid asparagine is reported. Reactions with diazoacetates offering intramolecular carbon-hydrogen insertion provide evaluative data that demonstrate differential diastereoselection. Surprisingly, placement of a carbonyl group within the chiral attachment remove, enantiocontrol from the catalyst, presumably because of intramolecular ylide formation.
Synthesis and pheromone activities of optically active neocembrenes and their geometrical isomers, (E,Z,E)- and (E,E,Z)-neocembrenes
作者:Tadahiro Kato、Masanobu Suzuki、Toyohiko Kobayashi、Barry P. Moore