Flexible Synthesis of Pyrimidines with Chiral Monofluorinated and Difluoromethyl Side Chains
摘要:
Chiral pyrimidines with a fluorine atom in the benzylic position are easily accessible in high enantiomeric excesses from optically active propargylic intermediates by two complementary routes. Both the use of optically active propargylic fluorides and the fluorination of the chiral pyrimidine in the final stage give excellent results in terms of enantiocontrol. On the other hand, original pyrimidines with a difluoromethyl side chain are also obtained in a few steps from new propargylic ketones bearing a CHF2 substituent on the triple bond.
New Enantioselective Synthesis of Monofluorinated Pyridines Designed for the Preparation of Chemical Libraries
作者:Anne-Laure Blayo、Stéphanie Le Meur、Danielle Grée、René Grée
DOI:10.1002/adsc.200700488
日期:2008.2.22
Chiral pyridines with a fluorine atom in the benzylic position are easily accessible from optically active propargylic fluorides by using the Bohlmann–Rahtz reaction. Such pyridines, possessing four points of molecular diversity, are useful scaffolds for the preparation of chemicallibraries.
Chiral pyrimidines with a fluorine atom in the benzylic position are easily accessible in high enantiomeric excesses from optically active propargylic intermediates by two complementary routes. Both the use of optically active propargylic fluorides and the fluorination of the chiral pyrimidine in the final stage give excellent results in terms of enantiocontrol. On the other hand, original pyrimidines with a difluoromethyl side chain are also obtained in a few steps from new propargylic ketones bearing a CHF2 substituent on the triple bond.