Preparation of Oxazolidine-Containing Peptides: Unusual effects in RhIII-catalyzed acetalizations of aldehydes with urethane-protected serine and threonine esters and with dipeptides containing serine or threonine residues at the N-terminus
作者:Dieter Seebach、Thimo L. Sommerfeld、Qiongzhong Jiang、Luigi M. Venanzi
DOI:10.1002/hlca.19940770513
日期:1994.8.10
The cyclization reaction of aldehydes with Z- and Boc-protected β-hydroxyamino-acid esters (Tables 1 and 2), or of dipeptides containing serine or threonine at the N-terminus (Table 3), to give oxazolidine derivatives, occurs in the presence of isopropyl orthoformate and catalytic amounts of [Rh(MeCN)3(triphos)](CF3SO3)3. The reaction may be carried out under kinetic or under thermodynamic control
醛与Z-和Boc保护的β-羟基氨基酸酯(表1和2)或在N端含有丝氨酸或苏氨酸的二肽(表3)发生环化反应,生成恶唑烷衍生物。原甲酸异丙酯的存在和催化量的[Rh(MeCN)3(triphos)](CF 3 SO 3)3。该反应可以在动力学或热力学控制下进行,从而可以改变两种可能的差向异构产物的比例。可以从恶唑烷环的3位上除去保护基,并且所得的NH基团可以与另一个氨基酸偶联。因此,可获得一种用于制备包含β-羟基氨基酸衍生的恶唑烷(“伪脯氨酸”)的肽的新方法。还描述了N-新戊基取代的三肽。