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Chiral Modification of the Tetrakis(pentafluorophenyl)borate Anion with Myrtanyl Groups
Author(s) -
Pommerening Phillip,
Oestreich Martin
Publication year - 2019
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201901434
Subject(s) - chemistry , substituent , aldol reaction , boron , chalcone , lithium (medication) , asymmetric induction , medicinal chemistry , boranes , carborane , epoxide , enantioselective synthesis , organic chemistry , polymer chemistry , catalysis , medicine , endocrinology
The synthesis and characterization of chiral [B(C 6 F 5 ) 4 ] – derivatives bearing a myrtanyl group instead of a fluoro substituent in the para position are described. These new chiral borates were isolated as their bench‐stable lithium, sodium, and cesium salts. The corresponding trityl salts were prepared and tested as catalysts in representative counteranion‐directed Diels–Alder reactions and Mukaiyama aldol additions but no enantioselectivity was obtained. Preformation of a chalcone‐derived silylcarboxonium ion with the chiral borate as counteranion did not lead to any asymmetric induction in a reaction with cyclohexa‐1,3‐diene.