5-Bromo-2-(N-BOC-N-cyclopropyl

Synthesis of (2S, 4S, 5S)-5-(t-Butoxycarbonylamino)-4-(t-Butyldimethylsilyloxy)-2-Isopropyl-7-Methyl Octanoic Acid

to replace combinattons of leucme coupled with valine in pepttde sequences. The preparation described is the final method developed, after many early less successful attempts. The synthesis mvolves (Fig. 1 ) the coupling of 1-bromo-5-methyl-2-hexene 3 and N

Enzymes Acting on d-Amino Acid Containing Peptides

aminopeptidase and endopeptidase activities. The enzyme was active toward (d -Phe) n , Boc-(d -Phe) n , (d -Phe) n methyl ester, d -Phe-NH2 , Boc-(d -Phe) n methyl ester, and Boc-(d -Phe) n tert -butyl ester, but not toward (d -Ala) n (n = 2–4), (d

固相多肽合成树脂的特征和进展

反应来获得最大的优点。他们主要是讨论Fmoc方法的。如将对-羟甲基苯乙酸与氨甲基聚苯乙烯结合，得到所谓的PAM树脂（1-3）。在Boc和Fmoc化学中都有很广的应用。王（Wang）的对-烷氧基苯甲醇树脂（1-4）在Fmoc化学中也是很值得注意的。另外为了制备C-端为酰胺基的多肽，还可采用氨甲基树脂 这样得到的树脂替代值一般在0.3～1.2mmol/g之间；常规应用中0.5mmol/g较为理想。 Winger TM等报道，用N-（叔丁氧羰基）-2-氨基乙硫醚处理的氯甲基树脂