Toward Synthesis of α-Alkyl Amino Glycines (A3G), New Amino Acid Surrogates
摘要:
A general method giving access to protected alpha-alkyl amino glycines (A3G) 4 from the previously described precursor alpha-isopropylthioglycine I is described. In the presence of N-bromosuccinimide, displacement of the thiol by a large variety of amines afforded the corresponding racemic amino acid mimics. The efficiency of the reaction was strongly dependent on the protective groups of the nucleophile used in the condensation.
[reaction: see text] The use of 1-tert-butoxy-2-tert-butoxycarbonyl-1,2-dihydroisoquinoline (BBDI) as tert-butoxycarbonylation reagent for aromatic and aliphatic amine hydrochlorides and phenols in the absence of a base has been demonstrated. The reactions proceed chemoselectively in high yield under mild conditions.
Photo-induced thiolate catalytic activation of inert Caryl-hetero bonds for radical borylation
作者:Shun Wang、Hua Wang、Burkhard König
DOI:10.1016/j.chempr.2021.04.016
日期:2021.6
the activation of bonds with high bond dissociation energy and to substrates with high reduction potentials. Herein, we introduce a novel photocatalytic strategy for the activation of inert substituted arenes for aryl borylation by using thiolate as a catalyst. This catalytic system exhibits strong reducing ability and engages non-activated Caryl–F, Caryl–X, Caryl–O, Caryl–N, and Caryl–S bonds in productive
A new simple, efficient, greener, and catalyst-free chemoselective protocol for the O-tert-butoxycarbonylation of various structurally diverse hydroxy compounds was carried out with (Boc)2O under microwave radiation. The corresponding O-tert-butoxy carbonates were obtained in good to excellent yields in a short reaction time without any side reactions.
Houlihan, F.; Bouchard, J.; Frechet, J. M. J., Canadian Journal of Chemistry, 1985, vol. 63, p. 153 - 162
作者:Houlihan, F.、Bouchard, J.、Frechet, J. M. J.、Willson, C. G.
DOI:——
日期:——
Facile<i>tert</i>‐Butoxycarbonylation of Alcohols, Phenols, and Amines using BiCl<sub>3</sub>as a Mild and Efficient Catalyst
作者:N. Suryakiran、P. Prabhakar、Y. Venkateswarlu
DOI:10.1080/00397910701749617
日期:2008.1
Facile tert-butoxycarbonylation of alcohols, phenols, and amines is described by treatment of alcohols, phenols, and amines with di-tert-butyl dicarbonate in the presence of a catalytic amount of bismuth(III) chloride, a mild and efficient catalyst, at room temperature in excellent yields.