Total Synthesis of (−)-Zampanolide and Questionable Existence of (−)-Dactylolide as the Elusive Biosynthetic Precursor of (−)-Zampanolide in an Okinawan Sponge
作者:Jun’ichi Uenishi、Takuya Iwamoto、Junichi Tanaka
DOI:10.1021/ol901167g
日期:2009.8.6
concise total synthesis of (−)-zampanolide, (−)-1, and (−)-dactylolide, (−)-2, is described. Synthetic highlights include (i) a mild Horner-Wadsworth-Emmons reaction providing the seco acid, (ii) an unusual stepwise cross-coupling reaction of a 1,1-dibromodiene with inversion of olefin geometry, and (iii) specific O-Michael reaction conditions using catalytic LHMDS with TMEDA for the synthesis of functionalized
描述了一种新的简明的全合成的(-)-樟脑内酯(-)-1和(-)-癸内酯(-)-2。合成亮点包括(i)温和的Horner-Wadsworth-Emmons反应提供癸二酸;(ii)1,1-二溴二烯的不寻常逐步交叉偶联反应,且烯烃的几何结构反转;以及(iii)特定的O- Michael反应条件,使用催化LHMDS和TMEDA合成功能化的2,6-顺式-四氢吡喃。分析了海用海绵提取物中是否存在(-)-2作为(-)-扎曼醇化物的生物合成前体。