A recyclable fluorous organocatalyst for Diels–Alder reactions
摘要:
Chiral fluorous imidazolidinone catalyst 2 provides consistently high enantioselectivities in Diels Alder reactions of dienes and alpha,beta-unsaturated aldehydes. The catalyst can be readily separated from the reaction products by fluorous solid-phase extraction, and recovered in excellent purity for direct reuse. (c) 2006 Elsevier Ltd. All rights reserved.
A recyclable fluorous organocatalyst for Diels–Alder reactions
摘要:
Chiral fluorous imidazolidinone catalyst 2 provides consistently high enantioselectivities in Diels Alder reactions of dienes and alpha,beta-unsaturated aldehydes. The catalyst can be readily separated from the reaction products by fluorous solid-phase extraction, and recovered in excellent purity for direct reuse. (c) 2006 Elsevier Ltd. All rights reserved.
Protecting-Group-Free Amidation of Amino Acids using Lewis Acid Catalysts
作者:Marco T. Sabatini、Valerija Karaluka、Rachel M. Lanigan、Lee T. Boulton、Matthew Badland、Tom D. Sheppard
DOI:10.1002/chem.201800372
日期:2018.5.11
Amidation of unprotected aminoacids has been investigated using a variety of ‘classical“ coupling reagents, stoichiometric or catalytic group(IV) metal salts, and boron Lewis acids. The scope of the reaction was explored through the attempted synthesis of amides derived from twenty natural, and several unnatural, aminoacids, as well as a wide selection of primary and secondary amines. The study also