Chemoselective Aldol Reaction of Silyl Enolates Catalyzed by MgI<sub>2</sub> Etherate
作者:Wei-Dong Z. Li、Xing-Xian Zhang
DOI:10.1021/ol026585e
日期:2002.10.1
Mukaiyama-type aldol coupling of typical silyl enolates 2-4 with aryl or vinyl aldehydes and acetals was realized in the presence of 1-5 mol % of MgI(2) etherate (1) in a mild, efficient, and highly chemoselective manner. Iodide counterion, weakly coordinating peripheral ethereal ligands (Et(2)O) of Mg(II), and a noncoordinating reactionmedia (i.e. CH(2)Cl(2)) are among the critical factors for the
Lewis Base-Catalysed Mukaiyama–Aldol Reaction of Trimethylsilyl Enolates with Aldehydes
作者:Xingxian Zhang、Junchen Shi、Shenghui Hu
DOI:10.3184/030823410x12733354109885
日期:2010.5
efficient Mukaiyama-type aldolreaction of three typical silyl enolates, such as 1-(trimethylsiloxy)-1-methoxy-2-methyl-2-propene, 1-phenyl-1-trimethylsilyloxyethene and 1, 2-bis(trimethylsiloxy)cyclobutene, with aryl aldehydes and α,β–unsaturated aldehydes catalysed by 5 mol% of Lewis base catalyst 4-O2NPhOMgI in dichloromethane is described. The reaction proceeds under mild reaction conditions in good
Acid‐Promoted Ring Opening of α‐Hydroxyl Cyclobutanones: A Novel and Facile One‐Pot Synthesis of Nitrile Derivatives
作者:Xingxian Zhang、Weidong Z. Li
DOI:10.1080/00397910500334629
日期:2006.2.1
Abstract A facile one‐pot synthesis of nitriles via a ring‐opening reaction of cyclobutanone adducts with hydroxylamine hydrochloride was developed.
摘要 通过环丁酮加合物与盐酸羟胺的开环反应,开发了一种简便的一锅法合成腈。
Facile and Efficient Synthesis of γ-Lactone and Butenolide Derivatives
作者:Xingxian Zhang、Jincai Guo、Shenghui Hu
DOI:10.1080/00397911.2010.527421
日期:2012.6
Abstract An efficient Baeyer–Villiger rearrangement of cyclobutanone derivatives was investigated. One-pot synthesis of keto-δ-lactone from the Baeyer–Villiger rearrangement products was developed. Meanwhile, the synthetic useful γ-lactone and butenolide derivatives could be easily prepared. GRAPHICAL ABSTRACT