First total synthesis of cyclodepsipeptides clavatustide A and B and their enantiomers
作者:Suresh Kumar Chettu、Rajesh Bagepalli Madhu、Gajendrasinh Balvantsinh Raolji、Korupolu Raghu Babu、N. S. Kameswara Rao、Srividya Gopalakrishnan、Ayesha Ismail、G. Bhanuprakash Reddy、Syed Shafi
DOI:10.1039/c6ra08861a
日期:——
The enantiopure synthesis of clavatustides A (1) and B (3) were accomplished by a seven step synthetic protocol starting from commercially available (R)-phenyllactic acid. As the optical rotation values of synthetic (R)-clavatustides A and B were not in agreement with the reported values, the corresponding antipodes 2 and 4 were synthesized from (S)-phenyllactic acid to address the issue. Both (R)
通过从市售(R)-苯基乳酸开始的七步合成规程完成对甲壳甾类化合物A(1)和B(3)的对映纯合成。由于合成的(R)-蛤壳类杀虫剂A和B的旋光度值与报告的值不一致,因此从(S)-苯基乳酸合成了相应的对映体2和4来解决该问题。(R)和(S)使用MTT分析法评估了甲壳类固醇A和B对三种人类癌细胞系的抗增殖活性。发现子宫颈癌细胞系(HeLa)在降低细胞活力方面对测试化合物最敏感。与它们的对映异构体(R-异构体)相比,S-异构体(2和4)对HeLa细胞系的IC 50分别为24.5和26.8μM ,表现出更好的抗增殖活性。所有测试的化合物对正常肺细胞的细胞活力影响很小,表明这些化合物对正常细胞无毒。