A concise and stereoselective chemoenzymatic synthesis of Sitophilate, the male-produced aggregation pheromone of Sitophilus granarius (L.)
作者:Silvana P. Ravía、Mariela Risso、Santiago Kröger、Silvana Vero、Gustavo A. Seoane、Daniela Gamenara
DOI:10.1016/j.tetasy.2013.08.004
日期:2013.10
(2S,3R)-Sitophilate, the male-produced aggregation pheromone of the granary weevil Sitophilus granarius (L.) was prepared stereoselectively using a novel chemoenzymatic approach in 50% overall yield. The synthetic design was based on an enantioselective fungal reduction of ethyl 2-methyl-3-oxopentanoate with a strain of Aureobasidium pullulans (CCM H1), followed by a Mitsunobu inversion at C3. The
(2 S,3 R)-Sitophilate,即谷类象鼻虫Sitophilus granarius(L.)的雄性产生的聚集信息素,是使用新型化学酶方法立体选择性地制备的,总收率为50%。合成设计的基础是用金黄色葡萄球菌(CCM H1)菌株将2-甲基-3-氧戊酸乙酯的对映选择性真菌还原,然后在C3进行Mitsunobu转化。合成序列的最后一步是使用无溶剂条件下的微波辐射,使用市售的南极假丝酵母B脂肪酶(CaL B,Novozym 435)进行的脂肪酶介导的酯交换反应。