Toward the Synthesis of Benzothiazolyl Fluoroaminosulfones
摘要:
Due to the importance of allylamines in organic synthesis, the synthesis of reagents as potent precursors of aminofluoroolefins is reported from functionalized benzothiazolylsulfones. The key intermediate, a fluorovinyl sulfone, was prepared and functionalized by addition of aliphatic, aromatic amines and amino acid alkyl esters through an aza-Michael addition reaction.
A mild and reproducible method for the formation of a nonstabilized azomethine ylide was developed by photoinduced reaction catalyzed with eosin Y under green light irradiation. Resulting 1,3-dipole was trapped with fluoroalkenes, fluoroalkylated alkenes, and representative dipolarophiles to access pyrrolidine scaffolds, including spirocyclic compounds. The mechanism involved in this transformation
Convergent access to mono-fluoroalkene-based peptidomimetics
作者:Florent Larnaud、Charlène Calata、Anaïs Prunier、Clothilde Le Guen、Rémi Legay、Emmanuel Pfund、Thierry Lequeux
DOI:10.1039/d1ob02441h
日期:——
The convergent and selective preparation of (Z)-monofluoroalkene-based dipeptideisosteres from functionalized fluorosulfones as a cornerstone is described. In this approach, the N-terminal amino group is introduced by a conjugate addition reaction of phthalimide onto fluorinated vinylsulfones containing α-amino-acid side chains while the C-terminal motif is linked to the fluorovinylic peptide bond
描述了以功能化氟砜为基石聚合和选择性制备( Z )-单氟烯烃基二肽电子等排体。在这种方法中, N端氨基通过邻苯二甲酰亚胺的共轭加成反应引入到含有 α-氨基酸侧链的氟化乙烯砜上,而C端基序通过Julia-Kocienski 反应与氟乙烯基肽键模拟物连接介于氟砜和带有 α-氨基酸侧链的取代醛之间。
Access to Fluoropyrrolidines by Intramolecular Aza-Michael Addition Reaction
作者:Clothilde Le Guen、Minh-Loan Tran Do、Aurélien Chardon、Cyril Lebargy、Jean-François Lohier、Emmanuel Pfund、Thierry Lequeux
DOI:10.1021/acs.joc.6b01363
日期:2016.8.5
Study of the intramolecular aza-Michael additionreaction from an aminofluorovinylsulfone opens a new route for the synthesis of pyrrolidine derivatives. An unexpected diastereoselective cyclization reaction was observed, leading preferentially to the anti-N-benzylpyrrolidine sulfone. The resulting sulfone was reacted with aldehydes to access β-substituted α-fluoroalkenyl pyrrolidines in one step.