C-10 Ester and Ether Derivatives of Dihydroartemisinin − 10-α Artesunate, Preparation of Authentic 10-β Artesunate, and of Other Ester and Ether Derivatives Bearing Potential Aromatic Intercalating Groups at C-10
作者:Richard K. Haynes、Ho-Wai Chan、Man-Ki Cheung、Wai-Lun Lam、May-Kei Soo、Hing-Wo Tsang、Arnd Voerste、Ian D. Williams
DOI:10.1002/1099-0690(20021)2002:1<113::aid-ejoc113>3.0.co;2-n
日期:2002.1
providing new C-10 ester and ether derivatives of the antimalarial drug dihydroartemisinin (DHA, 2) have been examined. β-Artesunate has been prepared for the first time, and has been differentiated from the antimalarial α-artesunate; the latter has been incorrectly designated as the β-epimer in Chemical Abstracts and some primary literature. New ester and ether derivatives bearing potential intercalating
已经检查了提供抗疟药双氢青蒿素 (DHA, 2) 的新 C-10 酯和醚衍生物的反应的制备和立体化学方面。β-青蒿琥酯首次制备,与抗疟药α-青蒿琥酯相鉴别;后者在化学文摘和一些主要文献中被错误地指定为 β-差向异构体。通过 Schmidt、Mitsunobu 和 DCC 偶联程序、在 DMAP 存在下的酰化或以 BF3 作为催化剂的羟基活化,已经合成了带有潜在嵌入基团的新酯和醚衍生物。当 DHA 的羟基对酰化剂或 DCC 中间体中的活化羧基充当亲核试剂时,只能获得 α-酯。当羟基被激活以被亲核试剂取代时,如在 Schmidt 或 Mitsunobu 程序中,β-酯和 β-醚被完全或主要获得。一个例外是涉及 DHA 和 1- 和 2-萘酚的 Mitsunobu 程序,其中获得差向异构体的混合物;然而,当使用 Schmidt 程序时,会发生 β-芳基醚的独家形成,中间体三氯乙酰亚胺被 SnCl2