Enantiospecific synthesis of N-benzyl-2-alkyl pyrrolidines and piperidines mediated by chiral organoborane reagents
摘要:
A new general method for synthesizing N-benzyl-2-alkylpyrrolidines and N-benzyl-2-alkylpiperidines, having very high enantiomeric excess, has been achieved starting from aldehydes and organoborane reagents.
One-Pot Asymmetric Synthesis of 2- and 2,3-Disubstituted Tetrahydrofuran Derivatives
摘要:
A novel and convenient one-pot asymmetric synthesis of 2- and 2,3-disubstituted tetrahydrofurans has been achieved in 56-81% yields and 86-99% ee from aliphatic and aromatic aldehydes via an allyl/crotyl/alkoxyallylboration-hydroboration-iodination-cyclization reaction sequence.