Reaction of a serine-derived organozinc reagent with chloroformates and ethyl oxalyl chloride under palladium catalysis. Preparation of protected (2S, 6S)-4-oxo-2,6-diaminopimelic acid and (2S)-4-oxoglutamic acid
作者:Richard F. W. Jackson、Neil Wishart、Martin J. Wythes
DOI:10.1039/c39920001587
日期:——
Organozinc reagent 1 reacts with phenyl chloroformate under palladium catalysis to give the protected 4-oxo-2,6-diaminopimelic acid derivative 3, derived by formal displacement of both chloride and phenoxide; the symmetrical ketone 3, together with protected 4-oxoglutamic acid 10, are formed when ethyl oxalyl chloride is used as substrate.
The present invention relates to a copolymer termed a ladder copolymer because it has two backbones that serve as legs/sides of a ladder structure. These two backbones, one of which is a nucleic acid or nucleic acid-like polymer, are linked together as the legs/sides of a ladder are linked together by the rungs.
The present invention relates to a copolymer termed a ladder copolymer because it has two backbones that serve as legs/sides of a ladder structure. These two backbones, one of which is a nucleic acid or nucleic acid-like polymer, are linked together as the legs/sides of a ladder are linked together by the rungs.
The present invention relates to a copolymer termed a ladder copolymer because it has two backbones that serve as legs/sides of a ladder structure. These two backbones, one of which is a nucleic acid or nucleic acid-like polymer, are linked together as the legs/sides of a ladder are linked together by the rungs.