Straightforward Synthesis of Optically Pure Methyl (S)-2-Phthalimido-4-oxobutanoate and Some of Its Acetal and Thioacetal Derivatives
作者:Patrick Meffre、Philippe Durand、François Le Goffic
DOI:10.1055/s-1995-4056
日期:1995.9
An improved procedure for the synthesis of optically pure methyl (S)-2-phthalimido-4-oxobutanoate (3a) and some of its acetal and thioacetal derivatives 4, 5 and 7 from cheap commercially available L-methionine methyl ester hydrochloride (1a) is described.
A New Simple Route to<i>N,O</i>-Protected (<i>S</i>)-2-Amino-4-oxobutyric Acid
作者:Eckehard Volker Dehmlow、Ralf Westerheide
DOI:10.1055/s-1993-26029
日期:——
Methionine is converted into the N,O-protected derivative 1b. Chlorination of 1b with sulfuryl chloride results in a mixture of the α-halosulfides 2a and 2b in the ratio of 6:1. Hydrolysis of 2a gives the title compound 3 in 64 % yield.