Stereoselective synthesis of kurzilactone and determination of its absolute configuration
作者:Biao Jiang、Zili Chen
DOI:10.1016/s0957-4166(01)00506-7
日期:2001.11
Both (5S,7S)- and (5R,7S)-isomers of kurzilactone were synthesized from a ‘chiral epoxy-aldehyde synthon’ through the coupling of an acyl anion equivalent and the dianion of acetoacetate, followed by formation of the Kawa-type lactone by cyclization and elimination. Comparing the spectral data of the synthesized and naturally occurring kurzilactone, the C(5)- and C(7)-stereogenic centers of the natural
苯并内酯的(5 S,7 S)-和(5 R,7 S)异构体都是由“手性环氧-醛合成子”通过酰基阴离子当量与乙酰乙酸二酯的偶联而合成的,然后形成通过环化和消除作用得到Kawa型内酯。比较合成的和天然存在的库尔齐内酯的光谱数据,将天然库尔齐内酯的C(5)-和C(7)-立体异构中心指定为具有(5 R,7 S)-绝对构型的校正抗关系。