(1,1,3,3-四甲基烯丙基)锂 (1),通过在 -92 o C 下用 1-(二甲氨基)萘基锂裂解相应的苯基硫化物或通过三甲基锡衍生物与 CH 3 Li 在 THF/二乙基酯中反应制备乙醚/TMEDA 在 -78 o C 下,在 -78 o C 下快速加入萘和 1-(二甲氨基)萘中,得到相应的 1-取代的 1,2- 和 1,4-二氢萘的混合物
The development of a sequential O–H/C–Hbond functionalization of phenols initiated by the cationic gold(I)-catalyzed cyclization of 1-bromo-1,5-enynes to produce (2-bromocyclopent-2-en-1-yl)phenols is reported. This unprecedented domino transformation efficiently proceeds under mild conditions (5 mol % of (t-Bu)3PAuNTf2, CH2Cl2, 0–23 °C) via an intermediate aryl alkyl ether which collapses at ambient
Novel Photoreaction Using Diphenyl Disulfide Derivatives: Photoinduced Oxidation of Allyl Alcohol
作者:Takaaki Tsuboi、Yutaka Takaguchi、Sadao Tsuboi
DOI:10.1246/bcsj.81.361
日期:2008.3.15
Allyl alcohols are oxidized to acrylaldehydes using diphenyl disulfide derivatives upon photoirradiation. The reaction occurs via α-hydrogen abstraction by a sulfanyl radical. Interestingly, the ox...
Oxidative tandem alkoxide conjugate addition to nitroalkenes/radical 5-exo cyclizations—a versatile synthesis of functionalized 3-nitrotetrahydrofurans
作者:Ullrich Jahn、Dmytro Rudakov、Peter G. Jones
DOI:10.1016/j.tet.2011.12.010
日期:2012.2
were conveniently obtained in moderate to good yield and moderate to very good diastereoselectivity by an oxidative tandem process consisting of conjugateadditionreaction of lithium allyloxides to nitroalkenes followed by SET oxidation of the resulting nitronates. This triggers a radical cyclization; ligand transfer from the oxidant provides the products. The influence of the counter ion of the initial
5-Adamantylated 1,2,4-Trioxanes: Adamantane Position is Crucial for Antiparasitic Activity
作者:Axel Griesbeck、Viktor Schlundt
DOI:10.1055/s-0030-1261225
日期:2011.10
Allylic alcohols with 1′- and 2′-adamantanyl functionalization, available by reaction of 3-methylcrotonaldehyde with 1- and 2-bromoadamantane, respectively, were reacted with singlet oxygen under solution conditions with high diastereoselectivities to give the β-hydroperoxy alcohols. Lewis acid catalyzed peroxyacetalization of the β-hydroperoxy alcohols resulted in two sets of 1,2,4-trioxanes. The
Enantioselective C−C Bond Formation by Rhodium-Catalyzed Tandem Ylide Formation/[2,3]-Sigmatropic Rearrangement between Donor/Acceptor Carbenoids and Allylic Alcohols
作者:Zhanjie Li、Huw M. L. Davies
DOI:10.1021/ja9075293
日期:2010.1.13
The rhodium-catalyzed reaction of racemic allyl alcohols with methyl phenyldiazoacetate or methyl styryldiazoacetate results in a two-step process, an initial oxonium ylide formation followed by a [2,3]-sigmatropic rearrangement. This process competes favorably with the more conventional O-H insertion chemistry as long as donor/acceptor carbenoids and highly substituted allyl alcohols are used as substrates