The reaction of N,N-dialkyl-O-trimethylsilyl carbamates with different carbonyl compounds gives enamines under mild conditions in good yields. (C) 2000 Elsevier Science Ltd. All rights reserved.
Insertion of CO2 and related heteroallenes into the Si–N-bond of methyl(N-morpholino)silanes
作者:Marcus Herbig、Uwe Böhme、Edwin Kroke
DOI:10.1016/j.ica.2017.12.020
日期:2018.3
forming carbamoylic moieties. The insertion reaction of isocyanates depends on the organic substituents bound to the heteroallene unit. PhNCO inserts twofold forming a biuret moiety, while nBuNCO yields urea units by insertion of just one molecule per Si–N-bond. The isothiocyanates are less reactive forming thiourea moieties. Aliphatic isothiocyanates furnish equilibriabetween the reactants and the
Synthesis of Tertiary Amines through Extrusive Alkylation of Carbamates
作者:Guoliang Zhang、David Favela、Winston L. Chow、Rishab N. Iyer、Alexander J. Pell、David E. Olson
DOI:10.1021/acs.orglett.2c02516
日期:2022.8.26
Basic amines are key elements of many biologically active natural products and pharmaceuticals. Given their inherent reactivity, it is often necessary to protect basic amines during target-directed synthesis, which results in wasteful protection/deprotection sequences. We report a step-economical approach enabling the protection of secondary amines as carbamates prior to their conversion to tertiary
碱性胺是许多具有生物活性的天然产物和药物的关键元素。鉴于其固有的反应性,在靶向合成过程中通常需要保护碱性胺,这会导致保护/脱保护序列的浪费。我们报告了一种分步经济的方法,能够在仲胺通过 CO 2的正式挤出转化为叔胺之前将其保护为氨基甲酸酯。该方法适用于 iboga 生物碱 (±)-conodusine A 和 (±)-conodusine B 的合成。
KNAUSZ, D.;MESZTICZKY, A.;SZAKACS, L.;CSAKVARI, B.;UJSZASZY, K., J. ORGANOMET. CHEM., 1983, 256, N 1, 11-21
作者:KNAUSZ, D.、MESZTICZKY, A.、SZAKACS, L.、CSAKVARI, B.、UJSZASZY, K.
DOI:——
日期:——
JUNG M. E.; LYSTER M. A., J. CHEM. SOC. HEM. COMMUNS., 1978, NO 7, 315-316