Expanding the Scope of Donor/Acceptor Carbenes to N-Phthalimido Donor Groups: Diastereoselective Synthesis of 1-Cyclopropane α-Amino Acids
摘要:
Warming of 4-phthalimido-N-mesyl-1,2,3-triazole in the presence of alkenes followed by silica gel induced hydrolysis results in a highly diastereoselective and catalyst-free entry to N-phthalimidocyclopropanecarboxaldehydes.
A highly efficient, two-step, one-pot synthetic strategy for amides and peptides was developed by employing ynamides as novel couplingreagents under extremely mild reaction conditions. The ynamides not only are effective for simple amide and dipeptide synthesis but can also be used for peptide segment condensation. Importantly, no racemization was detected during the activation of chiral carboxylic
Tandem (2 + 2) Annulation/Retro-4π Electrocyclization/Imino-Nazarov Cyclization Reaction of <i>p</i>-Quinone Methides with Ynamides: Expeditious Construction of Functionalized Aminoindenes
作者:Ke-Yin Yu、Yu-Hua Deng、Xiao-Min Ge、Xian-Tao An、Peng-Fei Shu、Ye-Xing Cao、Xian-He Zhao、Chun-An Fan
DOI:10.1021/acs.orglett.1c02003
日期:2021.8.6
p-quinone methides (p-QMs) with ynamides is described. This cascade reaction features a uniquecombination of (2 + 2) annulation, retro-4π electrocyclization, and imino-Nazarov cyclization, wherein vinyl p-quinone methides (p-VQMs) as one of the key intermediates have been identified chemically. Significantly, an unusual structural reconstruction of p-QMs involving the cleavage of the C5–C6 bond and
Synthesis of 1,2,3-triazole ‘click’ analogues of thalidomide
作者:Jarrid M. Ronnebaum、Frederick A. Luzzio
DOI:10.1016/j.tet.2016.07.019
日期:2016.10
array of arylacetylenes and N-ethynyl/N-propargyl phthalimide derivatives. The sequence necessitated a new and scalable synthesis of the key click intermediate 3-azidoglutarimide. The dipolar cycloaddition reactions between the azidoglutarimide and the alkynylcoupling partners utilized a copper sulfate/sodium ascorbate reagent system in aqueous tetrahydrofuran and were first explored using substituted
Nucleophilic alkynes bearing sulfonamide, trimethylsilyl, or p-methoxyphenyl groups at the sp carbon reacted with 3-ethoxycyclobutanones to give formal [4+2] cycloadducts by activation with TiCl4. Reactions with 2-monoalkyl and 2-nonsubstituted 3-ethoxycyclobutanones gave phenol derivatives directly by benzannulation, while the use of 2,2-dimethyl-3-ethoxycyclobutanone gave the corresponding dienones
[EN] PYRROLOPYRIMIDINE COMPOUNDS, USE AS INHIBITORS OF THE KINASE LRRK2, AND METHODS FOR PREPARATION THEREOF<br/>[FR] COMPOSÉS DE PYRROLOPYRIMIDINE, LEUR UTILISATION À TITRE D'INHIBITEURS DE LA KINASE LRRK2, ET LEURS PROCÉDÉS DE PRÉPARATION
申请人:SOUTHERN RES INST
公开号:WO2017106771A1
公开(公告)日:2017-06-22
The present disclosure is concerned with certain pyrrolopyrimidine compounds that are capable of inhibiting certain protein kinases, and especially the leucine-rich repeat kinase 2 (LRRK2) protein. Compounds of the present disclosure can be used to treat a number of disorders caused by or associated with abnormal LRRK2 kinase activity. Compounds of the present disclosure can be used to treat disorders including neurodegenerative diseases such as Parkinson's disease; precancerous conditions and cancer; autoimmune disorders such as Crohn's disease, rheumatoid arthritis and psoriasis; and leprosy (Hansen's disease). This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.