Aqueous Compatible Protocol to Both Alkyl and Aryl Thioamide Synthesis
作者:Jianpeng Wei、Yiming Li、Xuefeng Jiang
DOI:10.1021/acs.orglett.5b03541
日期:2016.1.15
An efficient aqueous synthesis of thioamides through aldehydes, sodium sulfide, and N-substituted formamides has been developed. Both alkyl and aryl aldehydes are amenable to this protocol. N-Substituted formamides are essential for this transformation. Readily available inorganic salt (sodium sulfide) serves as the sulfur source in water, which makes this method much more practical and efficient.
Synthesis and Reactivity of a Stable Prototropic Isomer of 2-Acetyl-3-methylpyrrole
作者:Patrick G. Harran、Aleksandras Lotuzas、Anton El Khoury、Liubo Li
DOI:10.1055/a-1969-4095
日期:——
unstable imidoyl bromide adduct. Subsequent in situ cyclization under Heck conditions generated a stable prototropic isomer of 2-acetyl-3-methylpyrrole. The reactivity of this molecule toward acids, bases, and oxidants was explored, and its conversion into an α-methylidene γ-lactam was demonstrated. In protonated form, the molecule functioned as a reactive dienophile in Diels–Alder reactions.
Formamide as an efficient nitrogen nucleophile for the Michael addition to nitroalkenes
作者:Akio Kamimura、Ayako Kadowaki、Yoshiaki Nagata、Hidemitsu Uno
DOI:10.1016/j.tetlet.2006.02.065
日期:2006.4
Secondary acyclic formamide serves as an efficient nucleophile to nitroalkenes to give corresponding Michael adducts in good yields. The nitro group in the adducts was useful for further heterocyclic synthesis. (c) 2006 Elsevier Ltd. All rights reserved.
A Peptide Backbone Stapling Strategy Enabled by the Multicomponent Incorporation of Amide N‐Substituents
作者:Manuel G. Ricardo、Javiel F. Marrrero、Oscar Valdés、Daniel G. Rivera、Ludger A. Wessjohann
DOI:10.1002/chem.201805318
日期:2019.1.14
N‐modification of peptides on solid‐phase is presented as a powerful and general method to enable peptidestapling at the backbone instead of the side chains. This work shows that a variety of functionalized N‐substituents suitable for backbone stapling can be readily introduced by means of on‐resin Ugi multicomponent reactions conducted during solid‐phase peptide synthesis. Diverse macrocyclization chemistries