Chemo- and stereoselective dirhodium(II)-catalyzed C-H insertion reaction of 5,6-dioxygenated 2-diazo-3-oxohexanoates: Synthesis of an optically active highly functionalized cyclopentane
作者:Takayuki Yakura、Akiharu Ueki、Tsuyoshi Kitamura、Kenji Tanaka、Masatake Nameki、Masazumi Ikeda
DOI:10.1016/s0040-4020(99)00369-5
日期:1999.6
1]octane-1-carboxylate (5) via oxonium ylide formation/1,2-shift. On the other hand, a similar treatment of methyl (S)-5,6-bis[tert-butyldimethylsilyl(TBDMS)oxy]-2-diazo-3-oxohexanoate (9a) afforded the C-H insertion product 10 which was directly reduced with lithium aluminum hydride to give stereoselectively (1R,2R,3S,5R)-2,3-bis(TBDMSoxy)-5-hydroxycyclopentanemethanol (13) in 52% yield from 9a.
(S)-α-重氮-2,2-二甲基-β-氧代-1,3-二氧戊环-2-丁酸(4),在回流的二氯甲烷中用四乙酸dir(II)处理后,得到甲基(1 S, 5 S)-2,2-二甲基-7-氧代-3,8-二氧杂双环[3.2.1]辛烷-1-羧酸酯(5)通过形成叶立德/ 1,2-移位。另一方面,对(S)-5,6-双[叔丁基二甲基甲硅烷基(TBDMS)氧基] -2-重氮-3-氧代己酸甲酯(9a)进行类似处理,得到CH插入产物10,该产物被直接还原为氢化铝锂可选择性立体产生(1 R,2R,3 S,5 R)-2,3-双(TBDMSoxy)-5-羟基环戊烷甲醇(13)从9a的产率为52%。