BAGGIOLINI, ENRICO G.;PIZZOLATO, GIACOMO;USKOKOVIC, MILAN R., TETRAHEDRON, 44,(1988) N 11, 3203-3208
作者:BAGGIOLINI, ENRICO G.、PIZZOLATO, GIACOMO、USKOKOVIC, MILAN R.
DOI:——
日期:——
Stereocontrolled synthesis of 19-epiajmalicine from loganin aglucone
作者:Enrico G. Baggiolini、Giacomo Pizzolato、Milan R. Uskoković
DOI:10.1016/s0040-4020(01)85952-4
日期:1988.1
The rare naturally occurring heteroyohimbine alkaloid 19-epiajmalicine (1) was prepared from loganin aglucone 6 via a sequence which involves as the central step the conversion of the δ-lactone 7, easily derived from 6, to the 6-epielenolic acid acetal 8. After transformation of the latter to the aldehyde ester 12, reductive condensation with tryptamine to give the lactam 13 and Bischler-Napieralski