N-protected γ-amino-β-keto-esters were synthesized from the corresponding N-protected N-carboxyanhydride (UNCAs) by reaction with the lithium enolate of ethyl acetate in good yields. These compounds are precursors of statine derivatives.
Rapid, one-pot synthesis of urethane-protected tripeptides
作者:Yun-Fei Zhu、William D. Fuller
DOI:10.1016/0040-4039(94)02391-n
日期:1995.2
Urethane-protected tripeptides are synthesized in solution, without isolation or purification of intermediates, using urethane-protected N-carboxyanhydrides as coupling reagents and hydrogenation for removal of N-protection.
A micro-flow rapid dual activation approach for urethane-protected α-amino acid <i>N</i>-carboxyanhydride synthesis
作者:Ren Okabe、Naoto Sugisawa、Shinichiro Fuse
DOI:10.1039/d2ob00167e
日期:——
the rapid dual activation (10 s, 20 °C) of a combination of an α-aminoacidN-carboxyanhydride and alkyl chloroformate in the synthesis of a urethane-protected α-aminoacidN-carboxyanhydride in a micro-flow reactor. The key to success was the combined use of two amines that activated both substrates with proper timing. Three amines, i-Pr2NEt, Me2NBn, or N-ethylmorpholine, were used with pyridine in