作者:Jochen Ammenn、Karl-Heinz Altmann、Daniel Bellu?
DOI:10.1002/hlca.19970800517
日期:1997.8.11
of 5′-ethyl-substituted thymidine dimers, the (5′R)- and (5′S)-configurated 33a and 33b respectively, in which the natural phosphodiester linkage is replaced by an amide group (C(3′)-CH2CONH-CH(5′)(Et)), arc described. Their fully protected derivatives 35a and 35b, respectively, are suitable for incorporation into antisense oligonucleotides. Unexpectedly, an attempted PdII-catalysed aza-Claisen rearrangement
'的5'-乙基取代的胸苷二聚体两者对映异构体,所述(5的合成[R - (5)'小号-构型)33A和33B分别在其中天然磷酸二酯键被酰胺基团代替(C( 3')-CH 2 CONH-CH(5')(Et)),描述。它们的完全保护的衍生物35a和35b分别适合于掺入反义寡核苷酸中。出乎意料的是,尝试的Pd II催化的三氯乙酰亚氨酸7的氮杂-克莱森重排提供了非对映异构纯的环丙烷衍生物17,其结构已通过X射线分析确认。