Polarity-Reversed Addition of Enol Ethers to Imines under Visible Light: Redox-Neutral Access to Azide-Containing Amino Acids
作者:Sen Yang、Shuangyu Zhu、Dengfu Lu、Yuefa Gong
DOI:10.1021/acs.orglett.9b03238
日期:2019.10.18
established for the construction of γ-azido aminoacids under visiblelight. This transformation features mild and redox-neutral conditions, affording a series of amino esters with excellent chemoselectivity. Preliminary mechanistic studies revealed that the addition of an oxyalkyl radical to imine is likely the rate-determining step. The obtained azido-containing amino esters could be successfully converted
Visible-Light-Mediated, Chemo- and Stereoselective Radical Process for the Synthesis of <i>C</i>-Glycoamino Acids
作者:Peng Ji、Yueteng Zhang、Yongyi Wei、He Huang、Wenbo Hu、Patrick A. Mariano、Wei Wang
DOI:10.1021/acs.orglett.9b00724
日期:2019.5.3
for efficient synthesis of C-glycosyl amino acids is described. Different from typical photoredox-catalyzed reactions of imines, the new process follows a pathway in which α-imino esters serve as electrophiles in chemoselective addition reactions with nucleophilic glycosyl radicals. The process is highlighted by the mild nature of the reaction conditions, the highly stereoselectivity attending C–C
Phosphine-catalyzed annulation of ethyl (arylimino)acetates: synthesis of highly functionalized oxoimidazolidines
作者:Guang-Ning Ma、Fei-Jun Wang、Jun Gao、Min Shi
DOI:10.1039/b811167g
日期:——
This paper describes an unexpected and novel nucleophilic phosphine-catalyzed annulation of ethyl (arylimino)acetates to give polysubstituted oxoimidazolidine derivatives in moderate to good yields from simple and easily available starting materials under mild conditions. In this reaction, the addition of methyl vinyl ketone (MVK) is essential to induce the formation of oxoimidazolidines.
Lewis-Acid-Catalyzed Selective Friedel–Crafts Reaction or Annulation between Anilines and Glyoxylates
作者:Wangyu Li、Dungai Wang、Xiao Liang、Zhixiong Jin、Shiwen Zhou、Guanru Chen、Yuanjiang Pan
DOI:10.1021/acs.orglett.2c01115
日期:2022.4.29
A Lewis-acid-catalyzed selective reaction between anilines and glyoxylates was developed for synthesis of diarylmethanes or oxoimidazolidines. Under the catalysis of AgOTf, a series of anilines-based diarylmethanes, including primary, secondary, and tertiary anilines, were obtained in moderate to good yields. Moreover, stereoselective oxoimidazolidines were performed with the catalysis of Cu(OAc)2·H2O