Synthesis of α,α-disubstituted unnatural amino acid derivatives using the aza-[2,3]-Wittig sigmatropic rearrangement
作者:James C. Anderson、Sarah Skerratt
DOI:10.1039/b207295e
日期:——
rearrangement precursors derivedfrom alanine, valine, phenylalanine and phenylglycine were synthesised with diethylamide and methylester anion stabilising groups. In the amide series only the alanine derived precursor rearranged upon deprotonation with KH. In the ester series the alanine, valine and phenylalanine precursors rearranged successfully with KH. The phenylalanine ester precursor gave an unselective
Stereocontrolled synthesis of (2S *,3R*,4R*)-4-hydroxy-3-methylproline using a silicon assisted aza-[2,3]-Wittig sigmatropic rearrangement
作者:James C. Anderson、Alice Flaherty
DOI:10.1039/b007586h
日期:——
The first racemic synthesis of the non-proteinogenic amino acid (2S,3R,4R)-4-hydroxy-3-methylproline (1) has been achieved via iodolactonisation of an unnatural amino acid derivative 4. The relative stereochemistry was derived from an efficient silicon assisted aza-[2,3]-Wittig sigmatropic rearrangement of 2.