97352-64-2Relevant articles and documents
Direct biosynthetic cyclization of a distorted paracyclophane highlighted by double isotopic labelling of l-tyrosine
Ear, Alexandre,Amand, Séverine,Blanchard, Florent,Blond, Alain,Dubost, Lionel,Buisson, Didier,Nay, Bastien
, p. 3662 - 3666 (2015)
The biosynthesis of pyrrocidines, fungal PK-NRP compounds featuring a strained [9]paracyclophane, was investigated in Acremonium zeae. We used a synthetic l-tyrosine probe, labelled with oxygen 18 as a reporter of phenol reactivity and carbon 13 as a tracer of incorporation of this exogenous precursor. The (18O)phenolic oxygen was incorporated, suggesting that phenol behaves as a nucleophile during the formation of the bent aryl ether.
Synthesis and Spectroscopic Properties of 13C- and 15N-Labelled tert-Butoxycarbonylglycines
Grehn, Leif,Pehk, Toenis,Ragnarsson, Ulf
, p. 1107 - 1111 (2007/10/02)
Three 13C-labelled bromoacetates have been reacted both with 15N-labelled and with unlabelled di-tert-butyl imidodicarbonate and the intermediates selectively deprotected to give the corresponding isotopomeric Boc-glycines for application in peptide synthesis.The products were characterized by 1H, 13C and 15N NMR and FT-IR spectroscopy.Isotope effects on chemical shifts and IR spectra for this set of compounds are tabulated.In addition, from three isotopomers 15N-labelled amides were also prepared.
β-LACTAM SYNTHESIS: CYCLIZATION VERSUS 1,2-ACYL MIGRATION-CYCLIZATION. THE MECHANISM OF THE 1,2-ACYL MIGRATION-CYCLIZATION
Godfrey, Jollie D.,Mueller, Richard H.,Langen, Derek J. Von
, p. 2793 - 2796 (2007/10/02)
The cyclization of hydroxamate 1 unexpectedly afforded two isomeric β-lactams 2 and 3.The mechanism for the formation of 3 has been shown by carbon-13 labeling to involve a novel 1,2-acyl migration-cyclization process.