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1 [有化]?保护基 HMG-CoA还原酶抑制剂中间体合成新工艺_stmopen 关键词】: 对映选择性氢化 保护基 工业化 [gap=518]Keywords】: enantioselective hydrogenation,protecting group,industrialization 2 ?保护基团 ...控制反应的区域选择性 保护某些基团后有利于多种产物的分离 保护某些基团后能提高反应的立体选择性 保护基团(Protecting Groups): 选择保护基时要考虑: 1、保护基的供应来源,经济易得 2、必须能容易地进行保护,且保护效率要高 5、保护基团在高度专一的条...
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Methods Apraclonidine was synthesized from P-Nitraniline by reaction with reduction, adding protection group, formylation, chlorination, cyclization, off-protecting group. 方法采用对硝基苯胺为原料,经还原、加保护基、甲酰化、氯化、环合、脱保护基六步反应法可进行化学合成。 - 2
If the tertiary butyloxycarbonyl group is being used as amino-protecting group, its removal is effected with acid, such as HCl and isopropanol as a solvent or with trifluoroacetic acid neat. 如果用三叔丁基羟基作为氨基保护基团使用,应用酸来将其脱去,如以盐酸和异丙醇为溶剂或无水三氟乙酸。 - 3
Recent funding for a conservation plan, through Birdlife Asia, a conservation group, is a start. But protecting colonies from egg-hunters is the immediate challenge, and not only in Zhejiang province. 最近,由亚洲鸟类保护组织提供的一笔用做保护计划的资金启动,但是保护那些繁殖地不受偷蛋者的侵扰是一个迫在眉睫的挑战,不光在浙江。
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