reaction was catalyzed by a chiral bis-oxazoline copper (l) complex 17. The absolute stereochemistry of each generated diastereomer (10f and 11f) was elucidated. Both enantiomers of the vitamin D3 CD ring synthons ((−)-21 and (+)-22) were synthesized from (−)-12 and (+)-13, respectively.
在具有(R)-泛内酯作为手性助剂的手性不饱和α-重氮-β-
酮酸酯9f的分子内
环丙烷化中观察到良好的非对映选择性(85:15)。该反应由手性双-
恶唑啉
铜(l)配合物17催化。阐明了每种生成的非对映异构体(10f和11f)的绝对立体
化学。
维生素D 3
CD环合成子的两种对映体((-)- 21和(+)- 22)分别由(-)- 12和(+)- 13合成。