Antifungal quinazolinones from marine-derived Bacillus cereus and their preparation
作者:Zhihong Xu、Yapeng Zhang、Haichao Fu、Huimin Zhong、Kui Hong、Weiming Zhu
DOI:10.1016/j.bmcl.2011.05.002
日期:2011.7
quinazolinones alkaloids, R(+)-2-(heptan-3-yl)quinazolin-4(3H)-one (1) and (2R,3′R)+(2S,3′R)-2-(heptan-3-yl)-2,3-dihydroquinazolin-4(1H)-one (2) (a pair of epimers), as well as seven known analogues, 2-methylquinazolin-4(3H)-one (3), 2-benzylquinazolin-4(3H)-one (4), cyclo-(Pro–Ile), cyclo-(Pro–Leu), cyclo-(Pro–Val), cyclo-(Pro–Phe), and cyclo-(Tyr–Pro) were isolated from the n-butyl alcohol extract of the marine-derived
两个新的喹唑啉酮生物碱,R(+)-2-(庚-3-基)喹唑啉-4(3 H)-一(1)和(2 R,3'R)+(2S,3'R)-2 -(庚烷-3-基)-2,3-二氢喹唑啉-4(1 H)-一(2)(一对差向异构体),以及七个已知类似物2-甲基喹唑啉-4(3 H)- (3),2-苄基喹唑啉-4(3H)-一(4),环-(Pro-Ile),环-(Pro-Leu),环-(Pro-Val),环-(Pro-Phe),和环-(Tyr–Pro)从n中分离出来来源于海洋蜡状芽孢杆菌041381的丁醇提取物。通过光谱分析和化学合成鉴定了这些新化合物。四个光学异构体5 - 8还合成。化合物1 - 8都表现出适度的抗真菌活性对白色念珠菌有1.3-15.6μM的MIC值。化合物5表现出最强大的抗真菌活性,这可能表明S构型和2,3-双键是抗真菌活性所必需的,而C-2和C-3'处的消旋作用降低了其抗真菌活性。