Diastereoselective additions of organolithium reagents to the CN bond of protected erythrulose oxime ethers. Synthesis of enantiopure α,α-disubstituted α-aminiacids
作者:J.Alberto Marco、Miguel Carda、Juan Murga、Florenci González、Eva Falomir
DOI:10.1016/s0040-4039(97)00165-2
日期:1997.3
The addition of organolithium reagents to the CN bond of several erythrulose-derived chiral (E)- and (Z)-ketoxime ethers has been shown to be highly diastereoselective for the (E)-isomers. A chelated transition state has been proposed to explain this result. The addition products were converted into the two α,α-disubstituted α-aminoacids (R)-2-(−)-methylserine and (R)-(+)-2-phenylserine.
已经证明,将有机锂试剂加到几种由赤藻糖衍生的手性(E)-和(Z)-酮肟醚的CN键上对(E)-异构体具有很高的非对映选择性。已经提出了螯合的过渡态来解释该结果。将加成产物转化为两个α,α-二取代的α-氨基酸(R)-2-(-)-甲基丝氨酸和(R)-(+)-2-苯基丝氨酸。