Absolute Stereochemistry of Fungal Beauveriolide III and ACAT Inhibitory Activity of Four Stereoisomers
作者:Taichi Ohshiro、Ichiji Namatame、Kenichiro Nagai、Takafumi Sekiguchi、Takayuki Doi、Takashi Takahashi、Kazuaki Akasaka、Lawrence L. Rudel、Hiroshi Tomoda、Satoshi Ōmura
DOI:10.1021/jo0611667
日期:2006.9.1
Fungal beauveriolide III (BeauIII, 1b), a cyclodepsipeptide inhibiting acyl-CoA:cholesterol acyltransferase (ACAT) and showing antiatherogenic activity in mouse models, consists of l-Phe, l-Ala, d-allo-Ile, and 3-hydroxy-4-methyloctanoic acid (HMA) moieties, but the stereochemistry of the HMA part has not until now been fully defined. To determine it, four HMA stereoisomers were synthesized and labeled
真菌beauveriolide III(BeauIII,1B)中,环缩酚酸肽抑制酰基-CoA:胆固醇酰基转移酶(ACAT)和示出在小鼠模型中抗动脉粥样活性,由升-Phe,升-Ala,d -同种异体-Ile,和3-羟基4-甲基辛酸(HMA)部分,但至今尚未完全定义HMA部分的立体化学。为了确定它,合成了四个HMA立体异构体,并用手性荧光试剂(S)-(+)-2-(蒽-2,3-二二羧酰亚胺基)-1-丙基三氟甲烷磺酸盐(AP-OTf)进行了标记。通过HPLC分离衍生物,并与天然HMA衍生物进行比较,从而将其鉴定为(3 S,4 SBeauIII中的HMA。此外,四个beauveriolide III异构体((3 S,4 S)BeauIII(23a),(3 R,4 R)BeauIII(23b),(3 R,4 S)BeauIII(23c)和(3 S,4 R)BeauIII(23d))被合成,并且显示23