Nucleosides and Nucleotides. Part 154. New Neplanocin Analogues. VIII. Synthesis and Biological Activity of 6'-C-Ethyl, -Ethenyl, and -Ethynyl Derivatives of Neplanocin A.
作者:Satoshi SHUTO、Takumi OBARA、Yasuyoshi SAITO、Kanako YAMASHITA、Motohiro TANAKA、Takuma SASAKI、Graciela ANDREI、Robert SNOECK、Johan NEYTS、Elisabeth PADALKO、Jan BALZARINI、Erik DE CLERCQ、Akira MATSUDA
DOI:10.1248/cpb.45.1163
日期:——
report describes the synthesis and antiviral effects of (6'R)-6'-C-ethynyl, -ethenyl, and -ethyl derivatives of neplanocin A (7a, 8a, and 9a, respectively) and the corresponding 6'S-diastereomers (7b, 8b, and 9b, respectively), as examples of 6'-C-substituted analogues of neplanocin A. Grignard reaction of the 6'-formyl derivative 4, which was readily prepared from neplanocin A, with ethynylmagnesium
该报告描述了neplanocin A(分别为7a,8a和9a)和相应的6'S-非对映异构体(7b)的(6'R)-6'-C-乙炔基,-乙烯基和-乙基衍生物的合成和抗病毒作用(分别为8b和9b)分别作为neplanocin A的6'-C取代类似物的例子。很容易由neplanocin A制备的6'-甲酰基衍生物4与乙炔基溴化镁的格氏反应,得到非对映异构体混合物相应的1,2-加成产物5a和5b。除去保护基团后,将(6'R)-和(6'S)-6'-C-乙炔基内啡肽A(7a,7b)分离。分别通过7a和7b的催化氢化制备相应的乙烯基衍生物8a和8b以及乙基衍生物9a和9b。与neplanocin A相比,新的neplanocin A衍生物是S-腺苷-L-高半胱氨酸水解酶的弱得多的抑制剂,R-非对映异构体比S-非对映异构体更具抑制性。活性的降低顺序为7a> 8a> 7b> 9a> 8b> 9b。细胞毒性(对