aza-henry james什么意思?

来源：蜘蛛抓取(WebSpider) 时间：2012-04-03 18:54 标签： henry james
Bifunctional-thiourea-catalyzed diastereo- and enantioselective aza...
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2005 Dec 23;12(2):466-76.Bifunctional-thiourea-catalyzed diastereo- and enantioselective aza-Henry reaction.1, , , , .1Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.AbstractBifunctional thiourea 1a catalyzes aza-Henry reaction of nitroalkanes with N-Boc-imines to give syn-beta-nitroamines with good to high diastereo- and enantioselectivity. Apart from the catalyst, the reaction requires no additional reagents such as a Lewis acid or a Lewis base. The N-protecting groups of the imines have a determining effect on the chirality of the products, that is, the reaction of N-Boc-imines gives R adducts as major products, whereas the same reaction of N-phosphonoylimines furnishes the corresponding S adducts. Various types of nitroalkanes bearing aryl, alcohol, ether, and ester groups can be used as nucleophiles, providing access to a wide range of useful chiral building blocks in good yield and high enantiomeric excess. Synthetic versatility of the addition products is demonstrated by the transformation to chiral piperidine derivatives such as CP-99,994.PMID:
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求翻译：When Henry ford decided to produce his famous v-8 motor, he chose to build an engine with the entire eight cylinders cast in one block, and instructed his engineers to produce a design in是什么意思？
When Henry ford decided to produce his famous v-8 motor, he chose to build an engine with the entire eight cylinders cast in one block, and instructed his engineers to produce a design in
问题补充：
当亨利 · 福特决定生产他著名的 v 8 电机时，他选择一个块，现浇的整个八缸发动机，并指示他的生产设计工程师
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亨利·福特时决定,出示其著名汽车V8引擎,他选择了建立一个同整个八瓶领衔主演在一块,并指示其工程师,产生一种设计在
当Henry Ford决定生产他的著名V-8马达，他在一个块选择制造一辆机车与整个八个圆筒塑像，并且指示他的工程师生产设计在
当亨利 · 福特决定生产他著名的 v 8 电机时，他选择一个块，现浇的整个八缸发动机，并指示他生产设计工程师
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