Synthesis of dipeptide isosteres by cross-metathesis
作者:J. Eric Enholm、Tammy Low、Daniel Cooper、Ion Ghivirija
DOI:10.1016/j.tet.2012.06.004
日期:2012.8
This work describes the attachment of two amino acid derivatives by olefin cross-metathesis using Grubbs' second generation catalyst. They were connected at the carboxyl termini. In addition, a cyclic dilactam scaffold was used, which reacted with only a fraction of the amino acid derivatives. The remaining fraction coupled directly coupled with no scaffold. This highly trans-selective double attachment
A novel 1-tert-butoxy-2-tert-butoxycarbonyl-1,2-dihydroisoquinoline (BBDI)-catalyzed esterification of N-protected amino acids with nearly equimolar amounts of alcohols in the presence of Boc2O
作者:Yukako Saito、Tomokazu Watanabe、Hiroki Takahata
DOI:10.1016/j.tetlet.2006.02.149
日期:2006.5
A very mild, BBDI-catalyzed esterification using approximately equimolar amounts of N-protectedaminoacids and alcohols, in junction with Boc2O is described.
planetary ball mill proved to be more suitable for the synthesis of aminoesters from N-protected aminoacids via a one-pot activation/esterification reaction in the presence of various dialkyl dicarbonates or chloroformates. The spot-to-spot reactions were straightforward, leading to the final products in reduced reaction times with improved yields and simplified work-up procedures.