Chemoenzymatic synthesis of (5S)- and (5R)-hydroxymethyl-3,5-dimethyl-4-(methoxymethoxy)-5H-thiophen-2-one: a precursor of thiolactomycin and determination of its absolute configuration
作者:Ahmed Kamal、Ahmad Ali Shaik、Shaik Azeeza、M. Shaheer Malik、Mahendra Sandbhor
DOI:10.1016/j.tetasy.2006.10.032
日期:2006.11
A convenient enantioselective synthesis of (5S)- and (5R)-hydroxymethyl-3,5-dimethyl-4-(methoxymethoxy)-5H-thiophen-2-one, a key intermediate in the synthesis of thiolactomycin has been carried out by a Carica papaya lipase-mediated resolution protocol to provide (R)-2 in a 94% ee and its enantiomer (S)-9 in a 98% ee. The absolute configuration at the C-5 position has been determined by Mosher’s method
进行了方便的对映选择性合成的(5 S)-和(5 R)-羟甲基-3,5-二甲基-4-(甲氧基甲氧基)-5 H-噻吩-2-酮,它是硫代催乳素合成中的关键中间体通过番木瓜脂肪酶介导的拆分方案分离得到94%ee的(R)-2和98%ee的对映体(S)-9。C-5位置的绝对构型已通过Mosher的方法确定。