Isoprene reacts with aldehydes in the presence of a catalytic amount of Pd(OAc)2–4PPh3 or Pd(PPh3)4 and a stoichiometric amount of SnCl2 at 40–50 °C in AcOH–H2O to produce 1-substituted 2,2-dimethyl-3-buten-1-ols regioselectively.
Iminoxyl Radical-Promoted Oxycyanation and Aminocyanation of Unactivated Alkenes: Synthesis of Cyano-Featured Isoxazolines and Cyclic Nitrones
作者:Fei Chen、Fei-Fei Zhu、Man Zhang、Rui-Hua Liu、Wei Yu、Bing Han
DOI:10.1021/acs.orglett.7b00826
日期:2017.6.16
oxidant, CuCN as the commercially available cyanating reagent, and pentamethyldiethylenetriamine (PMDETA) as the ligand. By using this protocol, a series of useful cyano-featured isoxazolines and cyclicnitrones were efficiently prepared.
Development of an Intramolecular Aryne Ene Reaction and Application to the Formal Synthesis of (±)-Crinine
作者:David A. Candito、Dennis Dobrovolsky、Mark Lautens
DOI:10.1021/ja306881u
日期:2012.9.19
A general and high yielding annulation strategy for the synthesis of various carbo- and heterocycles, based on an intramolecular aryne ene reaction is described. It was found that the geometry of the olefin is crucial to the success of the reaction, with exclusive migration of the trans-allylic-H taking place. Furthermore, the electronic nature of the aryne was found to be important to the success
Light-Induced 1,3-Thiosulfonylation of β,γ-Unsaturated Ketones with Thiosulfonates
作者:Jiuwen Xu、Bo-Xi Liu、Xin-Yu Liu、Weidong Rao、Shun-Yi Wang
DOI:10.1021/acs.orglett.4c01925
日期:2024.8.16
exhibit potent significance in drug molecules. Thiosulfonates as 1,3-thiosulfonylation reactants to olefins have yet to be investigated. Herein, we report photoinduced 1,3-difunctionalization of β,γ-unsaturatedketones with thiosulfonates, which undergo a radical 1,2-acyl shift. The protocol features mild conditions, high regioselectivity, and 100% atom economy.
Regioselective synthesis of substituted 1-indanols, 2,3-dihydrobenzofurans and 2,3-dihydroindoles by electrochemical radical cyclization using an arene mediator
Electrochemical reduction of haloarenes carrying 2-(1-hydroxybut-3-enyl), 2-allyloxy or N-allyl-N-methylamino group in the presence of phenanthrene as a mediator generated the corresponding aryl radicals and gave the corresponding 5-exo cyclization products in good yields. Higher regio- and stereoselectivities than those of usual radical cyclization using AIBN-Bu3SnH were achieved. (C) 2003 Elsevier Ltd. All rights reserved.