Direct synthesis of Fmoc-protected amino acids using organozinc chemistry: application to polymethoxylated phenylalanines and 4-oxoamino acids†
作者:Hervé J. C. Deboves、Christian A. G. N. Montalbetti、Richard F. W. Jackson
DOI:10.1039/b103832j
日期:——
organozinc reagent 1, obtained in 7 steps from optically pure L-serine, was coupled to a range of electrophiles under palladium catalysis to give substituted phenylalanines and 4-oxoamino acids in variable yields (21–59%). Transformation into the organocopper reagent 13 allowed coupling with allyl chloride and ethyl oxalyl chloride. Removal of the tert-butyl group gives Fmoc-protected amino acids (63–95%)
新型N -Fmoc 3-碘丙氨酸叔丁酯衍生的有机锌试剂1,从光学纯品中分7步获得大号丝氨酸,在钯催化下与一系列亲电试剂偶联,以可变的收率(21-59%)得到取代的苯丙氨酸和4-氧代氨基酸。转化为有机铜试剂13允许与烯丙基氯 和 草酰氯乙酯。拆除叔丁基 提供Fmoc保护 氨基酸 (63–95%),适用于自动化固相 肽 合成。