Aldol reactions of lithium enolates resulted from conjugate additions of tributylstannyllithium to 2-(phenylseleno)-2-cyclopenten-1-one provides 2-(1-hydroxyalkyl)-2-cyclopenten-1-ones in high yields. Significantly good 1,4-asymmetric induction took place in analogous aldol reactions starting with chiral 4-[(t-butyldimethylsilyl)oxy]-2-(phenylseleno)-2-cyclopenten-1-one.
烯醇
锂的羟醛反应由
三丁基锡锂与 2-(苯基
硒基)-2-
环戊烯-1-酮的共轭加成产生,以高产率提供 2-(1-羟基烷基)-2-
环戊烯-1-酮。在以手性 4-[(叔丁基二甲基甲
硅烷基)氧基]-2-(苯基
硒基)-2-
环戊烯-1-酮开始的类似醛醇反应中发生了显着良好的1,4-不对称诱导。