Synthesis of haminol-A and haminol-B, polyenic alarm pheromones of Cephalaspidean molluscs
摘要:
Two stereocontrolled palladium-catalyzed cross-couplings of I-alkenyl boronic acids and aryl/alkenyl halides (the Suzuki-Miyaura reaction) are the key steps in an enantioselective approach to the polyene fragment of haminols A and B, alarm pheromones isolated from Haminoea navicula, a Cephalaspidean Opisthobranch mollusc. Chirality rested on the use of (S)-propylene oxide as the starting material. (C) 1998 Elsevier Science Ltd. All rights reserved.
The synthesis of a focused library of jasplakinolide analogs with a 1,2,3-triazole in place of an E-configured double bond is described, featuring the Cu(I) catalyzed azideâalkyne cycloaddition reaction as an efficient macrocyclization tool.
Synthesis of (S)-(−)-austrocorticin and (S)-(+)-dermolactone: Absolute stereochemistry of the natural products.
作者:Ann S. Cotterill、Melvyn Gill
DOI:10.1016/s0040-4039(00)93405-1
日期:1993.5
(S)-(−)-austrocorticin (9) and (S)-(+)-dermolactone (2) are synthesised using the chiral dienes 6a md 6b, respectively; comparison with these synthetic compounds establishes that natural austrocorticin has the (R) absolute configuration while dermolactone occurs naturally as a mixture of enantiomers in which the (S) isomer predominates
Diastereoselective Alkene Hydroesterification Enabling the Synthesis of Chiral Fused Bicyclic Lactones
作者:Zhanglin Shi、Chaoren Shen、Kaiwu Dong
DOI:10.1002/chem.202103318
日期:2021.12.23
alkenes afforded chiral γ-butyrolactones bearing two stereocenters. Employing the carbonylation products as key intermediates, the route from alkenes with single chiral center to chiral THF-fused bicyclic γ-lactones containing three stereocenters was developed.
The synthesis of the S1-N10 nine-membered lactone core 28 of ent-griseoviridin is reported. Starting from cystine derivative 25, encompassing a terminal ynoate, treatment under Zn/ AcOH conditions led to the formation of lactone 28 in 12% yield. Therefore, the lactone moiety of ent-griseoviridin is obtained in 10.7% overall yield for two steps. An access to the corresponding 5-epi-griseoviridin lactone
Concise Synthesis of a Pateamine A Analogue with In Vivo Anticancer Activity Based on an Iron‐Catalyzed Pyrone Ring Opening/Cross‐Coupling
作者:Chun‐Xiang Zhuo、Alois Fürstner
DOI:10.1002/anie.201602125
日期:2016.5.10
A has previously been shown to exhibit remarkable in vivo activity against two different melanoma mouse models. The novel entry into this promising compound presented herein is shorter and significantly more productive than the literature route. Key to success was the masking of the signature Z,E‐configured dienoate subunit of DMDA‐Pat A in the form of a 2‐pyrone ring, which was best crafted by a gold‐catalyzed