Diastereoselective alkylation of 8-phenylmenthyl 2-methylacetoacetate. Preparation of enantiomerically pure 4,4-disubstituted 2-pyrazolin-5-ones
摘要:
Alkylation of (1R,3R,4S)-8-phenylmenthyl 2-methylacetoacetate with alkyl halides affords 2-alkyl-2-methylacetoacetates in diastereomeric ratios 72:28 to 85:15. The major R (at C-alpha) diastereoisomers are converted into enantiopure 4,4-disubstituted 2-pyrazolin-5-ones with recovery of the chiral inductor. (C) 1997 Elsevier Science Ltd.
Diastereoselective alkylation of 8-phenylmenthyl 2-methylacetoacetate. Preparation of enantiomerically pure 4,4-disubstituted 2-pyrazolin-5-ones
摘要:
Alkylation of (1R,3R,4S)-8-phenylmenthyl 2-methylacetoacetate with alkyl halides affords 2-alkyl-2-methylacetoacetates in diastereomeric ratios 72:28 to 85:15. The major R (at C-alpha) diastereoisomers are converted into enantiopure 4,4-disubstituted 2-pyrazolin-5-ones with recovery of the chiral inductor. (C) 1997 Elsevier Science Ltd.