Enantioseparation of benzazoles and benzanilides on polysaccharide-based chiral columns
作者:Takateru Kubota、Naotaka Sawada、Lili Zhou、Christopher J. Welch
DOI:10.1002/chir.20732
日期:2010.5.5
The chiral recognition ability of the polysaccharide‐based chiralcolumns (Chiralpak AD‐RH, Chiralpak AS‐RJ, Chiralpak IC, Chiralcel OD‐RH, and Chiralcel OJ‐RH) for the benzazoles and the benzanilides was evaluated under reversed phase conditions. The columns showed the high chiral recognition ability for a wide range of benzazoles and benzanilides. Twenty‐one racemates were used for the evaluation
New synthesis of pyrrolo-1,4-benzodiazepines by utilizing palladium-catalyzed carbonylation.
作者:MIWAKO MORI、GEDIMINAS E. PURVANECKAS、MINORU ISHIKURA、YOSHIO BAN
DOI:10.1248/cpb.32.3840
日期:——
A pyrrolo-1, 4-benzodiazepine skeleton which constitutes the common part of a series of antibiotics exhibiting antitumor activity was synthesized by insertion of carbon monoxide into o-bromoprolylaniline derivatives in the presence of a catalytic amount of Pd (OAc)2 and PPh3. In this reaction, hexamethylphosphoramide (HMPA) gave a good result as the solvent and the use of a high pressure of carbon monoxide (5 atom) increased the yield of the desired pyrrolo-1, 4-benzodiazepine.