作者:Cristina Arbelo Román、Philip Wasserthal、Jan Balzarini、Chris Meier
DOI:10.1002/ejoc.201100614
日期:2011.7.13
investigated by using different phenols and L-alanine methyl or benzyl ester. Generally, the reaction with 3- or 4-substituted phenols led to significantly better diastereoselectivities compared to their 2-substituted counterparts. Moreover, variation of the ester group in the amino acid residue resulted in no significant differences with regard to the obtained diastereoselectivity. From the reported results
最近报道了第一个非对映选择性合成 3'-脱氧-2',3'-二脱氢胸苷单磷酸 (d4TMP) 的芳氧基氨基磷酸酯前药。合成方法利用手性助剂 (S)-4-isopropylthiazolidine-2-thione (2)。对于该策略,需要立体化学纯的磷酰二胺中间体。通过使用不同的酚类和 L-丙氨酸甲酯或苄酯,研究了该关键化合物的非对映选择性形成。通常,与 3-或 4-取代苯酚的反应与它们的 2-取代对应物相比导致显着更好的非对映选择性。此外,氨基酸残基中酯基的变化导致获得的非对映选择性没有显着差异。根据报告的结果,详细阐述了过渡态的模型。