2,5-Diketopiperazines, new chiral auxiliaries for asymmetric Diels-Alder reactions
作者:Thuy X.H. Le、Jacqueline C. Bussolari、William V. Murray
DOI:10.1016/s0040-4039(97)00769-7
日期:1997.6
Diketopiperazines have been utilized as chiral auxiliaries for asymetric Diels-Alder reactions. Cyclo-S-phenylalanyl-R-proline (2) was found to be the most promising of these auxiliaries and afforded Diels-Alder adducts in high chemical yield (78–95%), with endo selectivities generally greater than 9:1. The diastereoselectivities observed were comparable to the best previously published values.
二酮哌嗪已经用作不对称Diels-Alder反应的手性助剂。发现环-S-苯丙氨酰基-R-脯氨酸(2)是这些助剂中最有前途的,并以高化学产率(78-95%)提供了Diels-Alder加合物,其内选择性通常大于9:1。观察到的非对映选择性可与先前最好的公开值进行比较。