作者:Takashi Kitayama、Masataka Awata、Yasushi Kawai、Azusa Tsuji、Yasuhiko Yoshida
DOI:10.1016/j.tetasy.2008.10.002
日期:2008.10
synthesized by lipase-catalyzed enantioselective transesterification of racemic compounds 9 and 10. The absolute configuration of (1R)-10 was determined by X-ray analysis after conversion to its ester with chlorine and that of (1R)-9 was determined by conversion to the corresponding 6,7-monoepoxyzerumbone. Interestingly, the stereoselectivity of 6,7-monoepoxyzerumbol obtained by lipase-catalyzed transesterification
通过氧化相应的单环氧zerumbols获得了通用的光学活性6,7-单环氧zerumbones(+)- 8和(-)- 8。通过脂肪酶催化外消旋化合物9和C的对映体选择性酯交换反应合成旋光性的赤型单环氧麦角酚(1 R)-9及其乙酸盐(1 S)-12和苏式(1 R)-10及其乙酸盐(1 S)-11 10。(1 R)-10的绝对构型在用氯转化成其酯后,通过X-射线分析法测定其含量,并通过转化成相应的6,7-单环氧zerumbone来测定(1R)-9的含量。有趣的是,通过脂肪酶催化的酯交换反应获得的6,7-单环氧麦角酚的立体选择性与2,3,6,7,10,11-三环氧化物的立体选择性相反。