Synthesis of the microbial elicitor syringolide 2 multiply labelled with deuterium
作者:Julian P. Henschke、Rodney W. Rickards
DOI:10.1002/(sici)1099-1344(199803)41:3<211::aid-jlcr69>3.0.co;2-9
日期:1998.3
Multiply-deuterated syringolide 2 3 was prepared from D-xylulose and 8-bromooctanoic acid by a convergent route based on our previously reported biomimetic synthesis of this microbial elicitor. Key steps were the thermal acylation of the anisylidene-protected sugar 6 with the C-octenoyl Meldrum's acid derivative 7b, the one-pot triple-cyclisation of the xylulose β-ketoester 9b to 9,10-dehydrosyringolide 2 (10),
多氘化丁香内酯 2 3 是由 D-木酮糖和 8-溴辛酸通过基于我们先前报道的这种微生物诱导剂的仿生合成的收敛途径制备的。关键步骤是使用 C-辛烯酰基 Meldrum 的酸衍生物 7b 对茴香基保护的糖 6 进行热酰化,将木酮糖 β-酮酯 9b 一锅三环化为 9,10-脱氢丁香内酯 2 (10),以及通过催化交换和还原在侧链中引入多个氘标记。该路线适用于氚标记的紫丁香内酯2 4 的合成。