Allylation of p-ketoaldehydes and functionalized imines by diallyltin dibromide: Formation of skipped and conjugated dienes
摘要:
Diallyltin dibromide reacts with beta-ketoaldehydes possessing no aromatic side groups and with (hydroxy) aryl imines to afford the expected homoallyl alcohols or amines respectively. With beta-ketoaldehydes having aromatic side groups, skipped or conjugated dienes are obtained depending on whether or not an aqueous work up procedure is used.
Erbium(III) Triflate: A Valuable Catalyst for the Rearrangement of Epoxides to Aldehydes and Ketones
作者:Antonio Procopio、Renato Dalpozzo、Antonio De Nino、Monica Nardi、Giovanni Sindona、Antonio Tagarelli
DOI:10.1055/s-2004-832842
日期:——
Rearrangement of epoxides is performed with erbiumtriflate as catalyst. In contrast to most proposed catalysts for this reaction, erbiumtriflate works well with both aromatic and aliphatic epoxides.
Synthesis of enaminones and their difluoroboron complexes through domino aryl migration
作者:Zheng Yang、Bo Jiang、Wen-Juan Hao、Peng Zhou、Shu-Jiang Tu、Guigen Li
DOI:10.1039/c4cc08257e
日期:——
A new domino strategy for selective synthesis of enaminones and their difluoroboron complexes through aryl migration has been developed. The reaction features low-cost and readily accessible starting materials, reliable scalability, and bond-forming efficiency as well as simple one-pot operation, which makes this strategy highly viable for future applications.
Abstract A simple procedure for the synthesis of 2H-pyran-2-ones 1 is described: selective Wittig olefination of keto aldehydes at the aldehyde group followed by a cyclization in acidic medium.