银杏大蚕蝗白僵菌的分离、培养及应用试验

从银杏大蚕蛾僵死虫（蛹）尸上分离的白僵菌B21.1，经过室内扩大培养，生产出含孢量185亿孢子／g菌剂，以其2亿孢子／ml菌液对银杏大蚕蛾幼虫室内毒力测定，表现出很高的致病能力：4天死亡率近半，10天校正死亡率达到98.51%；林间喷雾防治,10天左右致病死亡近50％，21天校正死亡率为84.36％；与其它菌株（剂）试验比较，其致病死亡率和杀虫效果均明显高于其他各供试菌株，表现了较强的专化性。     

L-苯丙氨酸与精左氨基物偶联反应的研究

采用叔丁氧羰基(Boc)、苄氧羰基(Z)和芴甲氧羰基(Fmoc)这3种保护基保护苯丙氨酸的氨基,顺利得到3个保护的苯丙氨酸(Ⅲa-c);保护的苯丙氨酸与精左氨基物(Ⅱ)进行偶联,较高收率地合成了3个未见文献报道的目标分子(Ⅳa-c),产物的结构通过IR,1H NMR,13C NMR测试得到了验证.对氨基酸的保护及偶联反应的条件进行了优化.

Abstract：

With butyloxycarbonyl (Boc), benzyloxycarbonyl (Z) and fluorenylmethyloxycarbonyl (Fmoc)as protecting groups, three amino group-protected L-phenylalanines were successfully obtained. Aided by different coupling reagents, three new conjugated products of the amino group-protected L-phenylalanines with chloramphenicolbase were synthesized with a yield of 70%-78%. The chemical structures of the new compounds were confirmed by IR, 1H NMR, and 13C NMR.The conditions for the reactions mentioned above were optimized.