Enantioselective Intramolecular [2,3]‐Sigmatropic Rearrangement of Aldehydes via a Sulfonium Enamine Intermediate
作者:Li Li、Baoli Chen、Jiean Chen、Yong Huang
DOI:10.1002/anie.202010234
日期:2020.11.16
sulfur‐containing aldehydes by using a sulfonium enamine intermediate as a formylcarbene mimetic is reported. This is an enantioselective, organocatalytic [2,3]‐sigmatropic rearrangement enabling chiral cyclic sulfides bearing an α‐quaternary chiral center to be prepared in high optical purity. The enantioselectivity is controlled with a cooperative organocatalyst pair consisting of a chiral amine and a
Facile Synthesis and Diels-AlderReactions of 2,6-Divinyl-1,4-dithiin
作者:Samuel Braverman、Marina Cherkinsky、Mihail L. Birsa、Hugo E. Gottlieb
DOI:10.1055/s-2003-38686
日期:——
A new and facile synthetic pathway to 2,6-divinyl-1,4-dithiin, involving easily available precursors is reported. The utility of the title compound as a reactive diene in Diels-Alder reactions was demonstrated in the synthesis of various thianthrene derivatives.
The present invention relates to isophthalic acid derivatives, to a process for their preparation and to their use for producing medicaments for the treatment and/or prophylaxis of diseases in humans and animals, in particular of cardiovascular disorders.
The Action of Metals on Unsaturated 1,4-Dihalides and Derivatives. I. Synthesis and Some Properties of Butatriene<sup>1</sup>
作者:W. M. Schubert、Thomas H. Liddicoet、Wayne A. Lanka
DOI:10.1021/ja01636a057
日期:1954.4
Phase-Transfer-Catalysed Alkylative Elimination: Synthesis of 10-Enynyl Acridones from Acridones and 1-Aryloxy-4-chlorobut-2-ynes
作者:K. C. Majumdar、S. K. Ghosh
DOI:10.1080/00397919408013821
日期:1994.1
A number of hitherto unreported 1O-enynylacridones (4a-f) were obtained in good yields by refluxing 10-(4-aryloxybut-2-ynyl) acridones (3a-f) with benzyltriethylamonium chloride (BTEAC) and aqueous potassium hydroxide (50%) in toluene or directly from acridones (1) and 1-aryloxy-4-chlorobut-2-ynes (5) under the same reaction conditions.