The marineantibiotic korormicin, isolated from the culture filtrate of marine bacterial strain Pseudoalteromonas sp. F-420, specifically inhibits the growth of marine Gram-negative bacteria without affecting terrestrial species. The absolute configuration of korormicin was determined by the combination of a CD exciton chirality method and chemical degradation. Convergent total synthesis of koromicin
Total Synthesis of the Oxopolyene Macrolide (−)-Marinisporolide C
作者:Luiz C. Dias、Emílio C. de Lucca
DOI:10.1021/acs.orglett.5b03352
日期:2015.12.18
The first totalsynthesis of (−)-marinisporolide C was performed in 25 steps (longest linear sequence) and an overall yield of 1%. Due to the high degree of convergence and robustness, the C9–C35 fragment that corresponds to the polyol portion was obtained in gram quantity. Highlights of this synthesis include five highly stereoselective aldol reactions responsible for the construction of five C–C
Total Synthesis of Marine Oxylipin Bacillariolides I–III
作者:Hiroaki Miyaoka、Masahide Tamura、Yasuji Yamada
DOI:10.1016/s0040-4020(00)00730-4
日期:2000.10
Marineoxylipin bacillariolides I–III were synthesized from (R)-malic acid, using diastereoselective one-pot formation of the chiral cyclopentane derivative from the anion of allyl phenyl sulfone and chiral epoxymesylate as the key reaction.
Synthesis of cyclopentane-containing marine eicosanoid bacillariolide II
作者:Hiroaki Miyaoka、Masahide Tamura、Yasuji Yamada
DOI:10.1016/s0040-4039(97)10660-8
日期:1998.2
Marine eicosanoid bacillariolide II was synthesized from (R)-malic acid, involving the diastereoselective one-pot formation of chiral cyclopentane derivative 12 from the anion of allyl phenyl sulfone and chiral epoxymesylate 11 as the key step. (C) 1998 Elsevier Science Ltd. All rights reserved.
Total Synthesis of Solandelactones A, B, E, and F Exploiting a Tandem Petasis−Claisen Lactonization Strategy
作者:James D. White、Christopher M. Lincoln、Jongtae Yang、William H. C. Martin、David B. Chan
DOI:10.1021/jo800335g
日期:2008.6.1
Solandelactones A, B, E, and F were synthesized using Nozaki-Hiyania-Kishi coupling of iododiene 13 with aldehydes 14 and 99 obtained by oxidation of alcohols 92 and 94. Key steps in the synthesis of 92 and 94 were (i) a Nagao asymmetric acetate aldol reaction of aldehyde 77 with thionothiazolidine 78 to set in place an alcohol that becomes the (7S) lactone center of solandelactones, (ii) a Simmons-Smith cyclopropanation of 80 directed by this alcohol, and (iii) Petasis methylenation of cyclic carbonate 90 in tandem with a Claisen rearrangement that generates the octenalactone portion of solandelactones. Synthesis of solandelactones A, B, E, and F confirmed their gross structure and absolute configuration at C7, 8, 10, and 14 but showed that alcohol configuration at C11 must be reversed in pairs, A/B and E/F, from the previous assignment made to these hydroid metabolites. Thus, solandelactones A and B are correctly represented by 2 and 1, respectively, whereas solandelactones E and F are 6 and 5. A biogenesis of solandelactones is proposed for these C(22) oxylipins that parallels a hypothesis put forward previously to explain the origin of C(20) cyclopropane-containing algal products.