Synthesis of Isoquinoline Derivatives Using ROM−RCM of Cyclobutene-yne
摘要:
Isoquinoline derivatives were synthesized from cyclobuten-ylmethylamine derivatives having an alkyne moiety in a tether using a second-generation ruthenium carbene complex under ethylene gas in good yields.
Intramolecular Aryne–Ene Reaction: Synthetic and Mechanistic Studies
作者:David A. Candito、Jane Panteleev、Mark Lautens
DOI:10.1021/ja205405n
日期:2011.9.14
chemistry of arynes is well developed, some challenges still remain. The ene reaction of arynes has not gained widespread use in synthesis as a result of poor yields and selectivity. A general, high yielding and selective intramolecular aryne-ene reaction is described providing various benzofused carbo- and heterocycles. Mechanistic data is presented, and a rationale for the resulting stereochemistry is
Intramolecular [2 + 2] Cycloaddition Reactions of Alkynyl Ether Derived Ketenes. A Convenient Synthesis of Donor–Acceptor Cyclobutanes
作者:Vincent Tran、Thomas G. Minehan
DOI:10.1021/ol202989c
日期:2011.12.16
of tert-butyl alkynylethers furnishes aldoketenes, which undergo facile [2 + 2] cycloaddition reactions with pendant di- and trisubstituted alkenes. A wide variety of cis-fused cyclobutanones are produced in moderate to high diastereoselectivity and good to excellent yields by this method, and free hydroxyl groups are tolerated in the ene-ynol ether starting materials. Enol-ynol ethers also undergo
Chemo- and Diastereoselective Acylfluorination of Nonactivated Olefins to Access Benzo[<i>b</i>]azepines
作者:Xingfeng Liu、Yuxi Wang、Tao Xu
DOI:10.1021/acs.orglett.2c04082
日期:2023.2.10
Here, we describe a transition-metal-free condition that realized the intramolecular acylfluorination of unactivated olefins. It was designed to access seven-membered-ring-containing benzo[b]annulenones from readily prepared 2-allylamino benzoic acids. The formation of a broad scope of electronically and sterically varied benzo[b]annulenones was demonstrated (>30 examples, up to 88% yield and >20:1
在这里,我们描述了一种无过渡金属的条件,该条件实现了未活化烯烃的分子内酰基氟化。它旨在从易于制备的 2-烯丙基氨基苯甲酸中获取含有七元环的苯并 [ b ] 环烯酮。证明了电子和空间变化范围广泛的苯并 [ b ] 环烯酮的形成(>30 个实例,高达 88% 的产率和 >20:1 的 dr 比率)。机理研究表明,原位形成的 XatlFluor-E 活化酸酐是活性物质,可诱导亲电子 7-内触发环化,随后是阳离子的氟化物捕获。