Conversion of β-amino esters to β-lactams via tin(II) amides
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Wang,Roskamp
p. 9417 - 9420
(2007/10/02)
A NEW CONVENIENT METHOD FOR β-LACTAM FORMATION FROM β-AMINO ACIDS USING BIS(5'-NITRO-2'-PYRIDYL) 2,2,2-TRICHLOROETHYL PHOSPHATE
Bis(5'-nitro-2'-pyridyl) 2,2,2-trichloroethyl phosphate is found to be a new efficient condensing agent for β-lactam formation from β-amino acids in acetonitrile.
Kim, Sunggak,Chang, Suk Bok,Lee, Phil Ho
p. 2735 - 2736
(2007/10/02)
A CONVENIENT METHOD FOR THE CONSTRUCTION OF β-LACTAM COMPOUNDS FROM β-AMINO ACIDS USING 2-CHLORO-1-METHYLPYRIDINIUM IODIDE AS CONDENSING REAGENT
Various β-lactams are prepared from the corresponding β-amino acids under mild reaction conditions in high yields by employing 2-chloro-1-methylpyridinium iodide as a condensing reagent.
A NOVEL METHOD FOR THE SYNTHESIS OF β-LACTAMS BY MEANS OF PHASE TRANSFER SYSTEM
The reaction of β-amino acids with methanesulfonyl chloride in a chloroform-water bilayer system in the presence of 15 molpercent of tetrabutylammonium hydrogen sulfate gives the corresponding β-lactams in good yields.
Watanabe, Yutaka,Mukaiyama, Teruaki
p. 443 - 444
(2007/10/02)
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