Synthesis and evaluation of chiral β-amino acid-based low-molecular-weight organogelators possessing a methyl/trifluoromethyl side chain
作者:Koichi Kodama、Ryuta Kawamata、Takuji Hirose
DOI:10.1039/c8nj05668d
日期:——
The synthesis and gelation properties of chiral β-amino acid-based low-molecular-weight organogelators, possessing methyl/trifluoromethyl sidechains, are reported. The structure of the sidechain and chirality were found to be important parameters affecting the gelation ability. The pure enantiomer of the trifluoromethylated β-amino acid displayed good gelation properties due to the formation of fibrillar
Iodine-Mediated Cyclization of Enamines to Imidazole-4-Carboxylic Derivatives with Sequential Removal of Nitrogen Atoms from TMSN<sub>3</sub>
作者:Peng Gao、Huaijuan Chen、Zi-Jing Bai、Sheng Zhang、Mi-Na Zhao、Desuo Yang、Yingchun Li、Jiangwei Zhang、Xiaomei Wang
DOI:10.1021/acs.joc.1c01145
日期:2021.8.6
iodine-mediated oxidative [4+1] cyclization of enamines with TMSN3 for the synthesis of 2,5-disubstituted imidazole-4-carboxylic derivatives has been developed. The mechanistic studies revealed that the reaction proceeds through a sequential removal of two nitrogen atoms from TMSN3. The synthetic utility was further demonstrated with a gram-scale reaction and various derivatization transformations of the products
Synthesis of 1-Alkyl-2-(trifluoromethyl)azetidines and Their Regiospecific Ring Opening toward Diverse α-(Trifluoromethyl)Amines via Intermediate Azetidinium Salts
作者:Sara Kenis、Matthias D’hooghe、Guido Verniest、Tuyet Anh Dang Thi、Chinh Pham The、Tuyen Van Nguyen、Norbert De Kimpe
DOI:10.1021/jo300694y
日期:2012.7.20
A convenient approach toward nonactivated 1-alkyl-2-(trifluoromethyl)azetidines as a new class of constrained azaheterocycles was developed staffing from ethyl 4,4,4-trifluoroacetoacetate via imination, hydride reduction, chlorination, and base-induced ring closure. Furthermore, the reactivity profile of these 2-CF3-azetidines was assessed by means of quaternization and subsequent regiospecific ring opening at C4 of the azetidinium intermediates by oxygen, nitrogen, carbon, sulfur, and halogen nucleophiles, pointing to a clear difference in reactivity compared to azetidines bearing other types of electron-withdrawing groups at C2.