An efficient synthesis of [4.4]-spirolactam restricted derivatives of the didemnin side chain dipeptide l-Pro-N-Me-d-Leu is described. This methodology involves: (a) peptide coupling of N-Boc-2-allylproline with d-Leu-OBn; (b) OsO4/NaIO4 mediated allyl oxidation and intramolecular cyclization to the corresponding cyclic hemiaminals; and (c) NaBH4 mediated reduction of an intermediate N-acyliminium
描述了一种有效的合成双嘧达明侧链二肽1-Pro- N -Me-d-Leu的[4.4]-螺内酰胺限制的衍生物。该方法涉及:(a)N -Boc-2-烯丙基脯氨酸与d-Leu-OBn的肽偶联;(b)OsO 4 / NaIO 4介导的烯丙基氧化和分子内环化成相应的环状半胱氨酸;(c)NaBH 4介导的中间N-酰基酰亚胺离子的还原。该合成策略比先前报道的合成[4.4]-螺内酰胺β-turn模拟物的策略提供了明显更好的结果。