Reagent Control of [1,2]-Wagner-Meerwein Shift Chemoselectivity Following the Nazarov Cyclization: Application to the Total Synthesis of Enokipodin B
作者:David Lebœuf、Christopher M. Wright、Alison J. Frontier
DOI:10.1002/chem.201203395
日期:2013.4.8
carbon framework of various sesquiterpenes from the herbertane and cuparane families is described, including the concise total synthesis of enokipodin B. The key step is the construction of the vicinal quarternary centers of the skeleton through a tandem Nazarovcyclization/Wagner–Meerwein rearrangement mediated by a copper(II) complex. During this study, it was also found that changing the ligand architecture
Enantioselective palladium catalyzed conjugate additions of ortho-substituted arylboronic acids to β,β-disubstituted cyclic enones: total synthesis of herbertenediol, enokipodin A and enokipodin B
作者:Jeffrey Buter、Renée Moezelaar、Adriaan J. Minnaard
DOI:10.1039/c4ob01085j
日期:——
Palladium catalyzed asymmetric conjugate addition of ortho-substituted arylboronic acids to cyclic enones and its application in natural product synthesis.
钯催化的手性共轭加成,将邻位取代的芳基硼酸加到环状烯酮上,并在天然产物合成中的应用。
Enantioselective total synthesis of enokipodins A–D
作者:Shigefumi Kuwahara、Mana Saito
DOI:10.1016/j.tetlet.2004.04.191
日期:2004.6
The first enantioselective total synthesis of enokipodins A–D, highly oxidized α-cuparenone-type sesquiterpenoids with antimicrobialactivity, was accomplished by using Meyers' diastereoselective alkylation protocol for the construction of the C7-quaternary asymmetric center. The present synthesis also constitutes a formal enantioselectivesynthesis of (S)-1,4-cuparenediol and (S)-cuparene-1,4-quinone
Total Syntheses of Enokipodins A and B Utilizing Palladium-Catalyzed Addition of An Arylboronic Acid to An Allene
作者:Masahiro Yoshida、Yasunobu Shoji、Kozo Shishido
DOI:10.1021/ol9001637
日期:2009.3.19
The enantioselective total syntheses of enokipodins A and B, alpha-cuparenone-type sesquiterpenoids with antimicrobial activity, have been achieved. The key step is the enantiospecific construction of the quaternary carbon center using a palladium-catalyzed addition of an arylboronic acid to an allene followed by an Eschenmoser-Claisen rearrangement.
Highly oxidized cuparene-type sesquiterpenes from a mycelial culture of Flammulina velutipes
Cuparene-type sesquiterpenes were isolated from a culture broth of Flammulina velutipes (Curt.:Fr.) Sing. Using spectroscopic methods (HR-MS,H-1 and C-13 NMR, and 2D NMR, spectroscopy), their structures were determined to be 2,3,4,5-tetrahydro-2,7-dihydroxy-5,8,10,10-tetramethyl-2,5-methano-1-benzoxepin and 5-methyl-2-(3-oxo-1,2,2-trimethylcyclopentyl)benzoquinone. Both showed antimicrobial activity against Cladosporium herbarum and Bacillus subtilis. (C) 2000 Elsevier Science Ltd. All rights reserved.