Synthesis, reactions and structure–activity relationships of 1-hydroxyspiro[2.5]cyclooct-4-en-3-ones: Illudin analogs with in vitro cytotoxic activity
摘要:
1-Hydroxyspiro [2.5]cyclooet-4-en-3-ones-analogs of natural illudines-were prepared in good yields by cyclization of 1,3-dicarbonyl dianions or 1,3-bis-silyl enol ethers ('masked dianions') with 1,1-diacylcyclopropanes. Several spirocyclopropanes showed a significant antiproliferative activity against human leukemia HL60 cells in vitro. 1-Hydroxyspiro [2.5]cyclooct-4-en-3-ones represent highly reactive precursors of unstable spiro[5.2]cycloocta-4,7-dien-6-ones and reactions with a number of nucleophiles were studied. (c) 2006 Elsevier Ltd. All rights reserved.
Domino “[3+3]-Cyclization-Homo-Michael” Reactions of 1,3-Bissilyl Enol Ethers with 1,1-Diacylcyclopropanes
作者:Gopal Bose、Van Thi Hong Nguyen、Ehsan Ullah、Sunanda Lahiri、Helmar Görls、Peter Langer
DOI:10.1021/jo0485278
日期:2004.12.1
The Lewis acid mediated domino " [3+3] -cyclization-homo-Michael" reaction of 1,3-bissilyl enol ethers with 1,1-diacylcyclopropanes allows an efficient one-pot synthesis of functionalized salicylates containing a halogenated side chain. A great variety of substitution patterns could be realized by variation of the starting materials and of the Lewis acid. The mechanism of the domino process was studied.
Synthesis and reactivity of 1-hydroxyspiro[2.5]cyclooct-4-en-3-ones
作者:Gopal Bose、Peter Langer
DOI:10.1016/j.tetlet.2004.03.134
日期:2004.5
The first 1-hydroxyspiro[2.5]cyclooct-4-en-3-ones were prepared by cyclization of free and masked 1,3-dicarbonyl dia-nions with 1,1-diacetylcyclopropane. 1-Hydroxyspiro[2.5]cyclooct-4-en-3-ones represent precursors of unstable spiro[5.2]cycloocta-4,7-dien-6-ones and reactions with a number of nucleophiles were studied. The reactions are enhanced by dynamic spiro-activation. (C) 2004 Elsevier Ltd. All rights reserved.