A Phosphine-Mediated Construction of 1,4-Oxazepines and 1,3-Oxazines
摘要:
A simple and efficient method for constructing 1,4-oxazepines and 1,3-oxazines was developed with use of a phosphine-mediated tandem reaction of ynones with 2-azido alcohols. The method offers a promising route to synthetically useful as well as biologically active heterocycles under mild conditions and may be exploited for the preparation of interesting chiral ligands.
A Phosphine-Mediated Construction of 1,4-Oxazepines and 1,3-Oxazines
摘要:
A simple and efficient method for constructing 1,4-oxazepines and 1,3-oxazines was developed with use of a phosphine-mediated tandem reaction of ynones with 2-azido alcohols. The method offers a promising route to synthetically useful as well as biologically active heterocycles under mild conditions and may be exploited for the preparation of interesting chiral ligands.
<scp>Palladium‐Catalyzed</scp>
Oxidative C≡C Triple Bond Cleavage of
<scp>2‐Alkynyl</scp>
Carbonyl Compounds Toward 1,
<scp>2‐Dicarbonyl</scp>
Compounds
<sup>†</sup>
作者:Ming‐Bo Zhou、Mu‐Jia Luo、Ming Hu、Jin‐Heng Li
DOI:10.1002/cjoc.202000040
日期:2020.6
palladium‐catalyzed oxidative strategy for the cleavage of the C≡C triple bond is presented. By employing PdCl2, CuBr2, TEMPO and air as the catalytic system and H2O as the carbonyl oxygen atom source, a wide range of 2‐alkynyl carbonylcompounds, including 1,3‐disubstituted prop‐2‐yn‐1‐ones, propiolamides and propiolates, lost an alkynyl carbon to access various 1,2‐dicarbonyl compounds, e.g., 1,2‐diones