Synthesis of aza-β-lactams by photochemical ring contraction
作者:Geoffery Lawton、Christopher J. Moody、Christopher J. Pearson
DOI:10.1039/c39840000754
日期:——
Photochemical decomposition of 4-diazopyrazolidine-3,5-diones (3) in the presence of nucleophiles, XH, leads to the aza-β-lactams (4); decarboxylation of (4e) gives the aza-β-lactam (7), which undergoes reductive ring cleavage to (8), and ring expansion to (9) on treatment with base.
BALLI H.; MUELLER V.; SEZEN-GEZGIN A., HELV. CHIM. ACTA <HCAC-AV>, 1978, 61, NO 1, 104-107
作者:BALLI H.、 MUELLER V.、 SEZEN-GEZGIN A.
DOI:——
日期:——
LAWTON G.; MOODY CH. J.; PEARSON CH. J., J. CHEM. SOC. PERKIN TRANS.,(1987) N 4, 877-884
作者:LAWTON G.、 MOODY CH. J.、 PEARSON CH. J.
DOI:——
日期:——
US5171656A
申请人:——
公开号:US5171656A
公开(公告)日:1992-12-15
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