Dibutyltin oxide mediated diastereoselective cyclodehydration/sulfonylation of 1,2,4-triols
摘要:
Dibutyltin oxide (Bu2SnO) mediated cyclodehydration or sulfonylation of 1,2,4-triols is predictably diastereoselective depending on the steric bulk of the substituents at C4. A larger difference (Delta A-value >1 kcal/mol) leads to the syn-1,2,4-triols favouring cyclodehydration (78-85%) to form 3-hydroxytetrahydrofurans, with the anti-1,2,4-triols favouring monosulfonylation (66-87%). Triols from symmetrical ketones preferentially undergo cyclodehydration in high yield (>75%) due to a gem-disubstituent effect. Thus, the 1,2,4-triols derived from simple cyclic ketones also favour cyclodehydration to form spirocyclic 3-hydroxytetrahydrofurans in 72-79% yields. (C) 2015 Elsevier Ltd. All rights reserved.
<i>De Novo</i> Asymmetric Synthesis of Avocadyne, Avocadene, and Avocadane Stereoisomers
作者:Vitor L. S. Cunha、Xiaofan Liu、Todd L. Lowary、George A. O’Doherty
DOI:10.1021/acs.joc.9b02391
日期:2019.12.6
The de novo asymmetric synthesis of all possible stereoisomers of two polyketide natural products, avocadyne, avocadene, and the saturated variant avocadane, is described. The stereodivergent synthesis of the 12 congeners is accomplished in 4–6 steps from an achiral acylpyruvate derivative, which, in turn, is prepared in five steps from commercially available materials. The approach uses, sequentially
Antimicrobial, antibacterial and spore germination inhibiting activity from an avocado extract enriched in bioactive compounds
申请人:INSTITUTO TECNOLOGICO Y DE ESTUDIOS SUPERIORES DE MONTERREY
公开号:US10575521B2
公开(公告)日:2020-03-03
The present disclosure relates to extracts from Persea sp. (avocado) enriched in bioactive compounds which can be used as antimicrobial, antibacterial or spore germination inhibiting agents, the process for obtaining the extracts, acetogenins and isolated molecules and methods for using the extracts enriched in bioactive compounds for providing antimicrobial, antibacterial or spore germination inhibiting effect.
Heptadecanols from the leaves of Persea americana var. americana
作者:Tzong-Huei Lee、Yow-Fu Tsai、Tzu-Tien Huang、Pi-Yu Chen、Wen-Li Liang、Ching-Kuo Lee
DOI:10.1016/j.foodchem.2011.11.067
日期:2012.5
From the leaves of Persea americana var. americana, eleven heptadecanol derivatives were identified. Their structures were elucidated on the basis of spectroscopic analyses. The absolute configurations were determined by chemical reaction, NOESY experiment and further comparison of the optical rotation value with the literature value. Additionally, the ratios of the contents of six heptadecanol derivatives in leaves, immature fruits, mature fruits and seeds of P. americana were estimated by LC-MS in multiple reaction monitoring (MRM) mode. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
ANTIMICROBIAL, ANTIBACTERIAL AND SPORE GERMINATION INHIBITING ACTIVITY FROM AN AVOCADO EXTRACT ENRICHED IN BIOACTIVE COMPOUNDS
申请人:ESTUDIOS SUPERIORES DE MONTERREY INSTITUTO TECNOLOGICO Y DE
公开号:US20130216488A1
公开(公告)日:2013-08-22
The present disclosure relates to extracts from
Persea
sp. (avocado) enriched in bioactive compounds which can be used as antimicrobial, antibacterial or spore germination inhibiting agents, the process for obtaining the extracts, acetogenins and isolated molecules and methods for using the extracts enriched in bioactive compounds for providing antimicrobial, antibacterial or spore germination inhibiting effect.