A new catalytic method for the denitrogenative transannulation/cyclopropanation of in‐situ‐generated 2‐(diazomethyl)pyridines is described using a cobalt‐catalyzed radical‐activation mechanism. The method takes advantage of the inherent properties of a CoIII‐carbene radical intermediate and is the first report of denitrogenative transannulation/cyclopropanation by a radical‐activation mechanism, which
Aroylcrownethers are complexing agents for metals, dispersing agents for carbon black and preferred ones are antiviral agents. Examplary is 4'-benzoylbenzo-18-crown-6 of the formula ##STR1##
Aroylcrownethers are complexing agents for metals, dispersing agents for carbon black and preferred ones are antiviral agents. Examplary is 4'-benzoylbenzo-18-crown-6 of the formula ##STR1##
Amino alcohol-boron-binol complex and method for preparing optically active amino alcohol derivative by using same
申请人:MOLECULES & MATERIALS CO., LTD.
公开号:US11130734B2
公开(公告)日:2021-09-28
Disclosed are an amino alcohol-boron-binol complex as an intermediate, including Complex 3-1-1 shown below, and a method for preparing an optically active amino alcohol by using the same, wherein a racemic amino alcohol is resolved in an enationselective manner using a boron compound and a (R)- or (S)-binol, whereby an amino alcohol derivative with high optical purity can be prepared at high yield.