A novel phosphorus–carbon bond formation by ring opening with diethyl phosphite of oxazolines derived from serine
作者:Franck Meyer、Abdelhamid Laaziri、Anna Maria Papini、Jacques Uziel、Sylvain Jugé
DOI:10.1016/j.tet.2004.03.001
日期:2004.4
A new reaction of oxazolines derived from serine with diethyl phosphite leading to ringopening products with P–C bond formation is reported. This reaction, which proceeds under neutral conditions and without the use of any halogenated intermediate, results in a mixture of racemic α- and β-phosphono alanines in an approximate 1:2 ratio, with isolated yields up to 77%. The mechanism involves the rearrangement
Efficient synthesis of β-halogeno protected l-alanines and their β-phosphonium derivatives
作者:Franck Meyer、Abdelhamid Laaziri、Anna Maria Papini、Jacques Uziel、Sylvain Jugé
DOI:10.1016/s0957-4166(03)00484-1
日期:2003.8
furnished the corresponding β-halogeno-N-benzoyl-α-amino acids in 70–95% yields. Quaternization of triphenylphosphine by the bromo or iodo derivatives led to the phosphonium salts bearing a free acid function in 95% yield, without racemization. The efficiency of this synthesis was demonstrated by the preparation of these phosphonium salts in excellent overall yields, by a one-pot procedure starting from the