N-Tritylamino acids activated with DCC/HOBt, were coupled with various aminoacid derivatives without racemization. The tritylgroup was split off quantitatively in 10% CCl3COOH monohydrate or CH2ClCOOH in CH2Cl2. Under these conditions detritylation of N-Trt-Trp-Gly-NH2 proceeds without formation of an oxindole derivative and side alkylation products, even in the absence of a scavenger. Dipeptide
A new one-pot synthesis of N-triphenylmethyl(trityl) α-amino acids 3 via their trityl ester 2 has been developed.
已开发出一种通过其三苯甲基酯2合成N-三苯甲基(trityl)α-氨基酸3的新型一锅合成方法。
A stereocontrolled synthesis of monofluoro ketomethylene dipeptide isosteres
作者:Robert V. Hoffman、Junhua Tao
DOI:10.1016/s0040-4039(98)00783-7
日期:1998.6
A simple, stereocontrolled synthesis of monofluoro ketomethylene dipeptideisosteres has been developed. The method is short (6 steps) and diastereoselective (85–95% de) and enantioselective (>95% ee).
作者:Meng Su、Christian Schmitt、Ziwei Liu、Samuel J. Roberts、Kim C. Liu、Konstantin Röder、Andres Jäschke、David J. Wales、John D. Sutherland
DOI:10.1021/jacs.3c03931
日期:2023.7.26
arises─before these enzymes evolved, how were primordial tRNAs selectively aminoacylated? Here, we demonstrate enzyme-free, sequence-dependent, chemoselective aminoacylation of RNA. We investigated two potentially prebiotic routes to aminoacyl-tRNA acceptor stem-overhang mimics and analyzed those oligonucleotides undergoing the most efficient aminoacylation. Overhang sequences do not significantly influence