Carbocations in Action. Design, Synthesis, and Evaluation of a Highly Acid-Sensitive Naphthalene-Based Backbone Amide Linker for Solid-Phase Synthesis
作者:Michael Pittelkow、Ulrik Boas、Jørn B. Christensen
DOI:10.1021/ol062410j
日期:2006.12.1
based on a regiospecifically substituted tetraalkoxy naphthaldehyde core are presented. This handle enables cleavage of peptide backbone amides (secondary amides) off a solid support using as little as 0.5% TFA in CH2Cl2. This proceeds without cleavage of tert-butyl ethers and tert-butyl esters. The design is based on a DFT study that predicted the most stabile alkoxy-substituted methyl naphthyl carbocation
A compound of formula (I), or a pharmaceutically acceptable salt thereof:
The compound is used in pharmaceutical compositions and in a method of treatment of a disease or medical condition which benefits from inhibition of gap junction activity by administering to a subject suffering from such disease or condition.
METHODS AND COMPOSITIONS FOR MAKING AN AMINO ACID TRIISOCYANATE
申请人:Warsaw Orthopedic, Inc.
公开号:US20150197488A1
公开(公告)日:2015-07-16
A method of making an amino acid triisocyanate is provided, the method comprising reacting an amino acid trihydrochloride with phosgene to form the amino acid triisocyanate. In some embodiments, the amino acid trihydrochloride comprises lysine ester trihydrochloride salt and the amino acid triisocyanate comprises lysine ester triisocyanate. In some embodiments, there is a lysine ester triisocyanate having a purity of at least about 98%, the lysine ester triisocyanate having a structure resulting from reacting lysine ester trihydrochloride salt with phosgene to form the lysine ester triisocyanate. These lysine ester triisocyanates can be used to make biodegradable polyurethanes.
Asymmetric Amino Acid Synthesis: Mitsunobu Reaction on Chiral Cyanohydrins
作者:Carl Decicco、Paul Grover
DOI:10.1055/s-1997-6139
日期:1997.6
BOC(SES)NH was reacted with chiral cyanohydrins using the Mitsunobu reaction to give good yields of protected α-aminonitriles, which were converted to chiral amino and imino acids.
XY–ZH Systems as potential 1,3-dipoles. Part 8. Pyrrolidines and Δ<sup>5</sup>-pyrrolines (3,7-diazabicyclo[3.3.0]octenes) from the reaction of imines of α-amino acids and their esters with cyclic dipolarophiles. Mechanism of racemisation of α-amino acids and their esters in the presence of aldehydes
Imines of α-aminoacidesters with aromatic, heterocyclic, and aliphatic aldehydes generate azomethine ylides stereospecifically by a prototropic shift on heating in toluene. The azomethine ylides undergo cycloaddition to N-phenylmaleimide, maleic anhydride, and p-naphthoquinone via an endo-transition state to give racemic, single diastereoisomeric, cycloadducts. α-Aminoacids undergo analogous cycloadditions