保护团

烯丙氧基羰基保护基 Alloc Protecting Group

概要

烯丙氧基羰基保护基(allyloxycarbonyl, Alloc)、经常用于通过形成氨基甲酸酯形成来保护胺基。
该保护基在强碱性条件下的酯的水解条件・亲核条件・比较弱的质子还原条件下都能显示出比较强的稳定性,通常使用Pd(0)催化的亲核取代反应进行脱保护。


基本文献

We are the only one site can offer 100-105 exam guides demo for almost all products. Cisco Certification Exams And Successful CaseThree-dimensional defense of subnet segment: the head office data center deploys double redundant PIX535 fire wall, divides the head office network into multiple isolation network segments: internal functional network, external network, INTERNET, etc.The isolation of firewall 300-070 test prevents security problems such as cross-network attack and 100-105 exam guides internetwork interference. Meanwhile, the scope of virus infection can also be effectively controlled, which greatly improves the security of each network segment.The core switch of the business network USES two Catalyst6500 high-performance switches with IDS module to 100-105 exam guides enhance 300-070 test security monitoring of the business network through IDS module.OA network is a key part of security and a major part of internal security risks. Therefore, OA network USES 300-070 test two Catalyst6500 high-performance switches with IDS and Firewall modules.The Firewall module enables security isolation between virtual lans, which is important for large OA networks.Guangdong development bank network system, including the head office data center and 210-260 dumps branch network, all need with the Internet, online banking, a shekel of silver coupon, and pedestrian liquidation, and other public 300-070 test information network interconnection, because these public information network is a completely open to 210-260 dumps the public 210-260 dumps information resources, so the network interface as the most 300-070 test vulnerable to hacking and require special safety control, provide reliable security.Therefore, Cisco has adopted the current advanced Cisco PIX firewall products and advanced and reliable firewall technology to provide 300-070 test reliable 300-070 test security protection for the entire network system.PIX of NAT (Network Address Translation) function for guangdong development bank Intranet Address Translation of each workstation provide dynamic or static gain legal external Address, such as well as to hide the internal Network, and can 210-260 dumps save the Address resource.In order to improve network reliability and eliminate single point of 100-105 exam guides failure, cisco took measures to connect two PIX firewalls with a Failover cable to perform a two-machine thermal backup.Firewall as the only export bank internal network, with the Internet and other public information network interconnection security control, 210-260 dumps at the same time for each workstation to access external information network within the network address translation (NAT) function.The switch USES MAC address filtering for security control, allowing only specific hosts to enter the PIX.The router is connected through multiple wan ports and provides certain security control to prevent illegal access and operation.In 210-260 dumps order to strengthen the control and management of the whole network, deployment of the ACS and Cisco for guangdong development bank access control server and security Policy Manager (Cisco Secure Policy Manager), 210-260 dumps using CSPM powerful strategy management infrastructure, users can 300-070 test bank on the network security products for scalable, 100-105 exam guides 100-105 exam guides unified management.

Cisco Certification 100-105 exam guides Exam CD, CCNA Lab Workbook Routing & Switching 200-125 and CCNA CRAM Study Sheet CertificationKits also offers additional study resources for your Cisco exams.We are proud to offer our CCNA Routing & Switching 200-125 Study Value Pack that is available for purchase for $69.99 if you already have your 210-260 dumps Cisco equipment. This Study Value Pack will provide you with the additional information you 100-105 exam guides will need to pass your test! The CCNA Study Disc includes 50 instructional videos and networking tools such as a TFTP Server and Subnet Calculator to help you pass your Cisco exams. Also included is our highly regarded and proven Cisco CCNA Lab Workbook that will walk you through 400+ pages and 60 different hands-on lab scenarios. What good is having 210-260 dumps the equipment if you don’t have 100-105 exam guides labs to follow along with so you can understand the concepts? This is a great companion for any Cisco home 300-070 test lab. We also include our CCNA R&S TCP/IP Poster which clearly illustrates the TCP/IP concepts 300-070 test and has a 100-105 exam guides handy IPv4 300-070 test vs IPv6 chart as IPv6 is hit hard on 100-105 exam guides the new exam. Finally, 100-105 exam guides 210-260 dumps you have read all the books, you have taken various test exams and now you wish you had a nice cheat 300-070 test sheet that had all 300-070 test the major concepts on it. Well we have it for you! 100-105 exam guides Our Cisco CCNA CRAM Sheet is a six page full color laminated fold out that is 210-260 dumps easy to read, easy to carry and will give you the extra edge you need to 210-260 dumps pass your CCNA exam! Additional Free Cisco Certification 210-260 dumps Resources CertificationKits also offers our various Cisco Certification Study Centers where 210-260 dumps you can read hundreds of free exam topic articles, review lab scenarios and view various videos. Feel free to browse the CCENT 100-101 Study Center, the CCNA 210-260 dumps v2 Study Center, our free CCNA Study Guide, the 100-105 exam guides CCNA 300-070 test Security 640-544 300-070 test Study Center, the CCNA 300-070 test Voice 640-461 Study Center, the CCNP Study Center, or the ultimate CCIE Study Center. You can also follow us on Twitter under CertKits and on Facebook under CertificationKits.com where we will highlight some of our 210-260 dumps most popular articles. Finally, we have Cisco CCNA, Cisco CCNP, CCIE, Microsoft MCPIT, Citrix CCA, Comptia A+ Net+ Sec+ Project+, VMWare VCP 5, and more certifications on staff! So, 100-105 exam guides we know networking! We work with 100-105 exam guides ambitious individuals,schools, businesses, welcome international orders, and ship worldwide! No order is too large or too small!

review

反应机理

保护

烯丙基氯甲酸酯(Alloc-Cl)常用作反应试剂。加入吡啶或三乙胺作为碱并与胺反应。对于氨基酸的保护等,使用无机碱的Schotten-Baumann条件也很常见。

脱保护

在Pd(0)催化剂作用下、生成π-烯丙基钯中间体、当适当的亲核试剂(如吗啉或1,3-二酮)共存时,脱保护可以以这样的方式进行。脱保护的胺亲核攻击π-烯丙基钯,并得到N-烯丙胺作为副产物。

反应实例

I2条件下的脱保护[1]

参考文献

  1. Szumigala, R. H. Jr.; Onofiok, K.; Karady, S.; Armstrong, J. D. III; Miller, R. A.Tetrahedron Lett. 2005, 46, 4403. doi: 10.1016/j.tetlet.2005.04.064

关联书籍(日亚价格)

Greene's Protective Groups in Organic Synthesis

Greene’s Protective Groups in Organic Synthesis

  • 著者Peter G. M. Wuts
  • 参考価格¥ 12,094日元
    価格¥ 11,813(2018/07/08 10:25時点)
  • 出版社John Wiley & Sons Inc

カスタマーレビューを見る

外部链接

本文版权属于 Chem-Station化学空间 欢迎点击按钮分享,未经许可,谢绝转载!

 

 

Related post

  1. 硼酸MIDA酯 MIDA boronate
  2. 氢负离子参与的还原反应(1) Hydrides-involved…
  3. Giese自由基加成反应(Giese Radical Addit…
  4. Honda-Reformasky反应
  5. MSH试剂 MSH reagent
  6. Mukaiyama羟醛反应(Mukaiyama Aldol Re…
  7. Ishikawa试剂
  8. 贝克曼重排反应(Beckmann rearrangement)

Comment

  1. No comments yet.

  1. No trackbacks yet.

You must be logged in to post a comment.

Pick UP!

微信

QQ

广告专区

PAGE TOP