cyclo-(Val-Orn-Leu-Phe-Pro)2 (L-L-L-D-L)2 is obtained as dihydrochloride (I). The cyclic products are purified by countercurrent distribution and identified with gramicidin S ditosylate and gramicidin S dihydrochloride21) respectively. This proves the structure of gramicidin S as cyclic decapeptide, and constitutes the first synthesis of a naturally occurring cyclic peptide.
杆菌肽S 10)的合成,一种来自Bac的肽抗生素。brevis详细介绍。将十肽衍
生物三苯甲基(Val-p-Tos Orn-Leu-Phe-Pro)2 OCH 3(LLLDL)2转化为相应的对硝基苯酯,选择性除去三苯甲基,并将所得产物环化为环-(Val-p-Tos Orn-Leu-Phe-Pro)2 2 H 2 O(LLLDL)2。液态
氨中的
钠会除去对
甲苯磺酰基和环-(Val-Orn-Leu-Phe-Pro)2(LLLDL)2以二盐酸盐(I)形式获得。通过逆流分配纯化环状产物,并分别用
短杆菌肽S ditosylate和
短杆菌肽S dihydrochloride 21)鉴定。这证明了
短杆菌肽S为环状十肽的结构,并且构成了天然存在的环状肽的第一合成。