導 讀
近日,暨南大學藥學院王國才副研究員報導了從中藥苦參中分離出的8個新的苦參鹼類生物鹼和9個已知化合物以及它們的抗HBV活性。相關研究發表於J. Nat. Prod.,題為「Matrine-Type Alkaloids from the Roots of Sophora flavescens and Their Antiviral Activities against the Hepatitis B Virus」。
結果速覽
文章報導分離得到的8個新化合物(1-8)和9個已知化合物(9-17)如下圖。化合物1−3是第一例D環開環的苦參鹼類生物鹼,而化合物4則是一個新的苦參鹼類生物鹼和哌啶二聚體,化合物5是第一例C-5−C-6斷裂的苦參鹼類生物鹼。
以3TC和苦參鹼為陽性對照,報導的苦參鹼類化合物抗HBV活性如下表:
通過比較化合物4與1,在C-15引入吡啶環可增強抗HBV活性和細胞毒性。另外,化合物5和9對HBsAg的抑制作用分別為46.0%和14.1%,表明C-5−C-6鍵的斷裂對抗HBV活性有積極的影響,而C-6−C7的斷裂則對抗HBV活性不利。
ABSTRACT
Eight new matrine-type alkaloids, flavesines G−J( 1−4), alopecurine B (5), 7,11-dehydro-oxymatrine (6), 10-oxy-5,6-dehydromatrine (7), and 10-oxysophoridine (8), along with nine known analogues (9−17) were isolated from the roots of Sophora flavescens. Compounds 1−3 are the first natural matrine-type alkaloids with an open-loop ring D, while compound 4 represents an unprecedented dimerization pattern constructed from matrine and piperidine, and 5 is the first example of a matrine-type alkaloid with cleavage of the C-5−C-6 bond. The new structures were elucidated by means of spectroscopic data analysis (including NMR, MS, IR, and UV), and the absolute configurations were determined using single-crystal X-ray diffraction and ECD data. The isolated alkaloids were evaluated for their antiviral activity against hepatitis B virus, and compounds 1, 4, 5, 10, and 14 exhibited comparable antiviral potencies to matrine.
本期編輯:碳硼酸