Chemoselective Nitrile Oxide–Alkyne 1,3-Dipolar Cycloaddition Reactions from Nitroalkane-Tethered Peptides
作者:Rahi M. Reja、Sereena Sunny、Hosahudya N. Gopi
DOI:10.1021/acs.orglett.7b01498
日期:2017.7.7
oxide, and chemoselective 1,3-dipolarcycloadditionreactions between in situ generated nitrile oxide and different alkynes are reported. The nitroalkane-mediated nitrile oxide–alkyne cycloaddition was found to be orthogonal to the copper(I)-catalyzed azide–alkyne cycloadditionreaction. The combination of orthogonal nitrile oxide–alkyne and azide–alkyne cycloadditionreactions can be explored to tailor
Stoffwechselprodukte von Mikroorganismen. 139. Mitteilung. Synthesen in der Sideramin-Reihe: Rhodotorulasäure und Dimerumsäure
作者:Jörg Widmer、Walter Keller-Schierlein
DOI:10.1002/hlca.19740570703
日期:1974.11.6
t-Butyl (E)-O-acetyl-Δ2-anhydromevalonate could be prepared. by a Reformatsky reaction of 4-acetoxybutan-2-one and t-butyl bromoacetate. Condensation of its activated derivatives with the diketopiperazine of N5-hydroxy-L-ornithine led to di-O-acetyl dimerumic acid, which could be transformed, by ammonolysis, to dimerumic acid, identical with the natural compound. The corresponding acetohydroxamic acid
Stoffwechselprodukte von Mikroorganismen 74. Mitteilung [1]. Synthese des Ferrichroms. 1. Teil: (S)-?-Amino-?-nitr-ovalerians�ure (?-Nitro-L-norvalin)
作者:B. Maurer、W. Keller-Schierlein
DOI:10.1002/hlca.19690520205
日期:——
(S)-α-Amino-δ-nitropentanoic acid (δ-nitro-L-norvaline), an intermediate of the total synthesis of ferrichrome, was synthesized starting from diethyl oxalate and γ-butyrolactone.