1,3-Dipolar cycloaddition of C-(2-thiazolyl)nitrones to chiral acrylates. Synthesis of enantiopure α-amino-2-alkylthiazoles and 5-formylpyrrolidin-2-ones
作者:Tomas Tejero、Alessandro Dondoni、Isabel Rojo、Francisco L Merchán、Pedro Merino
DOI:10.1016/s0040-4020(97)00040-9
日期:1997.3
The 1,3-dipolar cycloaddition of thiazolyl nitrones with chiral acrylates has been studied. The use of the Oppolzer's camphor sultam as chiral inductor provided isoxazolidines with excellent regio- and diastereoselectivities and good asymmetric induction. The cycloadducts were converted into homochiral α-amino-2-alkylthiazoles and 5-(2-thiazolyl)-3-hydroxy-2-pyrrolidinones. The latter compounds were
已经研究了噻唑基硝酮与手性丙烯酸酯的1,3-偶极环加成反应。使用Oppolzer的樟脑sultam作为手性诱导剂可以使异恶唑烷具有出色的区域选择性和非对映选择性以及良好的不对称诱导性。将环加合物转化为高手性α-氨基-2-烷基噻唑和5-(2-噻唑基)-3-羟基-2-吡咯烷酮。后者的化合物是高度官能化的吡咯烷的前体,其醛从噻唑环上解开,随后发生甲酰基反应。