racemic aryl-delta-oxoacids with (R)-phenylglycinol stereoselectively affords chiral non-racemic bicyclic lactams, from which the enantiodivergent synthesis of (R)- and (S)-2-phenylpiperidine, the diastereodivergent synthesis of cis- and trans-3-ethyl-2-phenylpiperidine, and the enantioselective synthesis of the piperidine alkaloid (-)-anabasine is reported.
用(R)-苯基甘
氨醇立体选择性地将非手性或外消旋的芳基-δ-氧代酸进行环脱
水,可得到手性的非外消旋双环内酰胺,其中,(R)-和(S)-
2-苯基哌啶的对映异构体合成,顺式-和反式-3-乙基-
2-苯基哌啶,以及
哌啶生物碱(-)-天麻碱的对映选择性合成。