A catalytic asymmetric entry to enantioenriched tertiary naphthoquinols via a facile tandem oxidation/ring-opening sequence
摘要:
The tertiary naphthoquinol is a key structural component of the antitumor natural products spiroxins A-E. Herein we report the first catalytic asymmetric approach to the tertiary naphthoquinol C4' stereogenic center present in the spiroxin framework, via tandem oxidation/ring-opening of a cyclic 3,4-epoxyalcohol. This new route allows a facile entry into relatively inaccessible tertiary naphthoquinols with high enantioselectivity and without the need of chiral auxiliaries. (C) 2011 Elsevier Ltd. All rights reserved.
A catalytic asymmetric entry to enantioenriched tertiary naphthoquinols via a facile tandem oxidation/ring-opening sequence
摘要:
The tertiary naphthoquinol is a key structural component of the antitumor natural products spiroxins A-E. Herein we report the first catalytic asymmetric approach to the tertiary naphthoquinol C4' stereogenic center present in the spiroxin framework, via tandem oxidation/ring-opening of a cyclic 3,4-epoxyalcohol. This new route allows a facile entry into relatively inaccessible tertiary naphthoquinols with high enantioselectivity and without the need of chiral auxiliaries. (C) 2011 Elsevier Ltd. All rights reserved.
Several derivatives of (1S)-1,2-dihydro-1-naphthalenol ((S)-7) have been synthesized and evaluated against human pancreatic adenocarcinoma cell line PANC-1 under nutrient-rich and nutrient-deprived conditions. The tert-butyldiphenylsilyl protected homoallylic alcohol (S)-8 displayed cytotoxicity against PANC-1 cells with an LC50 value of 11 mu M in the absence of essential amino acids, glucose, and serum, while exhibiting no cytotoxicity under nutrient-rich conditions. The observed selective antitumor activity of (S)-8 under nutrient deprived conditions suggests its potential as a promising lead structure for the design of future anti-pancreatic cancer agents. (C) 2015 Published by Elsevier Ltd.