Enantioselective deprotonation of meso-epoxides, derived from 3-cyclopenten-1-ol, was examined using chiral lithium amide. Chiral cis-4-t-butyldimethylsiloxy-2-cyclopenten-1-ol, cis-4-tetrahydropyranyloxy-2-cyclopenten-1-ol, and their trans-isomers, which are useful chiral building blocks for the synthesis of cyclopentanoid natural compounds, were obtained with high enantiomeric excesses (72–90% ee)
使用手性
氨基化
锂检查衍生自
3-环戊烯-1-醇的内消旋
环氧化物的对映选择性去质子化。手性 cis-4-t-丁基二
甲基甲
硅烷氧基-2-cyclopenten-1-ol、cis-4-tetrahydropyranyloxy-2-cyclopenten-1-ol 及其反式异构体,它们是合成
环戊烷类
天然化合物的有用手性构件, 以高对映体过量 (72-90% ee) 获得。(R)- 和 (S)-4-hydroxy-2-cyclopenten-1-one 均立体定向地衍生自 (1S,4R)-4-t-丁基二
甲基甲
硅烷氧基-2-cyclopenten-1-ol。