Catalytic Asymmetric [4+2]-Cycloaddition of Dienes with Aldehydes
作者:Luping Liu、Hyejin Kim、Youwei Xie、Christophe Farès、Philip S. J. Kaib、Richard Goddard、Benjamin List
DOI:10.1021/jacs.7b08357
日期:2017.10.4
Despite its significant potential, a general catalytic asymmetric [4+2]-cycloaddition of simple and electronically unbiased dienes with any type of aldehyde has long been unknown. Previously developed methodologies invariably require activated, electronically engineered substrates. We now provide a general solution to this problem. We show that highly acidic and confined imidodiphosphorimidates (IDPis)
Enzymatic Approach to and Odor Description of the Twelve Enantiomerically Pure Isomers ofPelargene®
作者:Agnese Abate、Maurizio Allievi、Elisabetta Brenna、Claudio Fuganti、Francesco G. Gatti、Stefano Serra
DOI:10.1002/hlca.200690020
日期:2006.2
fragrance sold as a mixture of three regioisomeric pyran derivatives (1–3). The enantiomers of each of the two possible diastereoisomers of 1–3 were prepared by means of a biocatalyzed approach, and the odor properties of the twelve isolated stereoisomers were evaluated.
Trifluoromethanesulfonic Acid, an Efficient Catalyst for the Hetero Diels-Alder Reaction and an Improved Synthesis of Mefrosol.
作者:Varinder K Aggarwal、Graham P Vennall、Paul N Davey、Chris Newman
DOI:10.1016/s0040-4039(97)00403-6
日期:1997.4
Trifluoromethanesulfonic (triflic) acid (1 mol%) has been found to be an efficient catalyst for the hetero Diels-Alder reaction between aromatic aldehydes and unactivated dienes. (C) 1997 Elsevier Science Ltd.