Total Synthesis of Dehydroaltenuene A. Revision of the Structure and Total Synthesis of Dihydroaltenuene B
作者:Martina Altemöller、Joachim Podlech
DOI:10.1021/np900265q
日期:2009.7.24
Total synthesis of alternaria toxins starting from previously synthesized altenuene (3) and isoaltenuene (4) is described. Dihydroaltenuene B (9) was prepared by hydrogenation of 3, and the non-natural epimer 3-epi-dihydroaltenuene A was obtained analogously from 4. Inspection of the spectroscopic data for 9 revealed that the originally proposed structure was in error. A revised structure (11), unambiguously
描述了从先前合成的altenuene(3)和isoaltenuene(4)开始的交链孢霉毒素的全合成。通过氢化3制备二氢铝烯B(9),类似地从4获得非天然差向异构体3- Epi -dihydroaltenueneA 。检查9的光谱数据表明,最初提出的结构有误。本文报道了经全合成明确证实的修饰结构(11)。在乙酸钯(II)的存在下用氧气氧化4导致形成脱氢铝烯A(8),而在相同条件下将3氧化,则生成ent- dehydroaltenuene B(ent - 9)。氧化4与锰(IV)氧化物布置dehydroaltenusin(12),尽管在低的产率得到仅不纯的物质。