A Formal [3,3]-Sigmatropic Rearrangement Route to Quaternary α-Vinyl Amino Acids: Use of Allylic <i>N</i>-PMP Trifluoroacetimidates
作者:David B. Berkowitz、Bin Wu、Huijie Li
DOI:10.1021/ol060019s
日期:2006.3.2
Pd(II)-mediated rearrangement of allylic N-PMP (p-methoxyphenyl) trifluoroacetimidates provides the first formal sigmatropic route to quaternary, alpha-vinylic amino acids, potential suicide substrates for PLP enzymes. The amino acid side chains enter via transition-metal-mediated C-C bond constructions, including (i) Cu(I)-mediated conjugate addition (Ala); (ii) Pd(0)/AsPh3-mediated Stille coupling
Pd(II)介导的烯丙基N-PMP(对甲氧基苯基)三氟乙酰亚氨酸酯的重排提供了第一个正式的sigmatropic途径,可以生成季铵,α-乙烯基氨基酸,是PLP酶的潜在自杀底物。氨基酸侧链通过过渡金属介导的CC键结构进入,包括(i)Cu(I)介导的共轭加成(Ala);(ii)Pd(0)/ AsPh3介导的Stille偶联(烯丙基-Gly,Phe,DOPA,m-Tyr);(iii)Pd(0)/ Pt-Bu3介导的Negishi偶联(Leu)。在DOPA脱羧酶灭活剂α-乙烯基-间-酪氨酸的合成中,新的N-PMP三氟乙酰亚胺比相应的三氯乙酰亚胺更有效地重排。