Preparation of methyl (1R,2S,5S)- and (1S,2R,5R)-2-amino-5-tert-butyl-cyclopentane-1-carboxylates by parallel kinetic resolution of methyl (RS)-5-tert-butyl-cyclopentene-1-carboxylate
作者:Stephen G. Davies、David Díez、Mohamed M. El Hammouni、A. Christopher Garner、Narciso M. Garrido、Marcus J. C. Long、Rachel M. Morrison、Andrew D. Smith、Miles J. Sweet、Jonathan M. Withey
DOI:10.1039/b308855c
日期:——
Comparison of the kinetic and parallel kinetic resolutions of methyl (RS)-5-tert-butyl-cyclopentene-1-carboxylate allows for the efficient synthesis of both (1R,2S,5S)- and (1S,2R,5R)-enantiomers of methyl 2-amino-5-tert-butyl-cyclopentane-1-carboxylate.
Kinetic resolution and parallel kinetic resolution of methyl (±)-5-alkyl-cyclopentene-1-carboxylates for the asymmetric synthesis of 5-alkyl-cispentacin derivatives
作者:Stephen G. Davies、A. Christopher Garner、Marcus J. C. Long、Rachel M. Morrison、Paul M. Roberts、Edward D. Savory、Andrew D. Smith、Miles J. Sweet、Jonathan M. Withey
DOI:10.1039/b506339f
日期:——
anti- to the stereodirecting 5-alkyl substituent. Treatment of a range of methyl (+/-)-5-alkyl-cyclopentene-1-carboxylates with both lithium (+/-)-N-benzyl-N-alpha-methylbenzylamide and lithium (+/-)-N-3,4-dimethoxybenzyl-N-alpha-methylbenzylamide indicates significant enantiorecognition in their mutual kineticresolutions, with preferential addition anti- to the 5-alkyl substituent, giving the 1,2-syn-1