Synthesis of 1,2-diazetidinones (aza-β-lactams) by photochemical ring contraction
作者:Geoffrey Lawton、Christopher J. Moody、Christopher J. Pearson
DOI:10.1039/p19870000877
日期:——
the presence of alcohols, diethylamine, or water gives 1,2-diazetidinones (12) formed by photochemical Wolff rearrangement with ringcontraction followed by reaction of the resulting ketene with the nucleophile. In the case of the bicyclic diazo compound (11d) a fragmentation reaction competes with ringcontraction. The aza-β-lactams (12) show the expected high frequency carbonyl stretch in their i.r