对于α-氨基仍采用Fmoc保护策略, 侧链氨基用二碳酸二叔丁酯引入叔丁氧羰基来保护,侧链胍基用酸敏感保护基2,2, 4,6,7-五甲基二氢苯并呋喃-5-磺酰基来保护. Fmoc, Boc and Pbf were used respectively to protect α - amido, side amido and side guanidine group.
He gave us his solemn word, then he welshed on us.他向我们郑重承诺然后又对我们食言了。She welshed on ( the bargain she made with ) us.她与我们洽谈成交后又翻悔了.He often welshed on his promises.他过去经常逃避义务,不履行诺言....
Ni-Al-X 催化剂是己二腈加氢的优良催化剂.The said catalyst was a good hydrogenation catalyst for adiponitrile.在间歇式反应器中成功地实现了己二腈 ( ADN ) 在近临界水中的水解.Hydrolysis of adiponitrile ( ADN ) in near - critical water was successfully conducted in a...
The church seems to be on the brink of schism.教会似乎处于分裂的边缘。We are much too apt to look at schism in our church as an unmitigated evil.我们太容易把自己教会中的分立看成是十恶不赦的.While some predict schism, others predict a good old fashioned c...