Pettit G R, Rhodes M R, Tan R
Cancer Research Institute and Department of Chemistry, Arizona State University, Tempe, Arizona 85287-2404, USA.
J Nat Prod. 1999 Mar;62(3):409-14. doi: 10.1021/np980168m.
Solution-phase synthesis of the marine sponge constituent phakellistatin 2 (1), cyclo(Tyr-Pro-Phe-Pro-Ile-Ile-Pro), was completed using a combination of stepwise coupling and (4 + 3) segment condensation. Use of diethyl phosphorocyanidate for the peptide bond formations gave the linear heptapeptide in 54% yield. Cyclization was achieved in high yields utilizing TBTU (2), BOP-C1 (3), PyBroP (4), and HOAt (5), resulting in 50-65% yields of phakellistatin 2 (1) depending on the method employed. The synthetic cyclic peptide was chemically but not biologically identical with the natural product.
利用逐步偶联和(4 + 3)片段缩合相结合的方法,完成了海洋海绵成分法可利他汀2(1),环(酪氨酸 - 脯氨酸 - 苯丙氨酸 - 脯氨酸 - 异亮氨酸 - 异亮氨酸 - 脯氨酸)的溶液相合成。使用二乙基亚磷酰氰化物进行肽键形成,以54%的产率得到线性七肽。利用O-(苯并三唑-1-基)-N,N,N',N'-四甲基脲四氟硼酸盐(2)、氯代苯并三唑-1-三吡咯烷基鏻六氟磷酸盐(3)、溴化(2-吡啶基)三苯基鏻(4)和1-羟基-7-氮杂苯并三唑(5),以高产率实现环化,根据所采用的方法,法可利他汀2(1)的产率为50 - 65%。合成的环肽与天然产物在化学上相同,但在生物学上不同。