e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
A concise strategy for the syntheses of indole alkaloids of the heteroyohimboid and corynantheioid families. Total syntheses of (.+-.)-tetrahydroalstonine,(.+-.)- …
SF Martin, B Benage, JE Hunter
Index: Martin, Stephen F.; Benage, Brigitte; Hunter, James E. Journal of the American Chemical Society, 1988 , vol. 110, # 17 p. 5925 - 5927
(8) For example, one of the principal deficiencies in those approaches to the yohimboid and heteroyohimboid alkaloids that relies upon the oxidative cyclizations of seco-derivatives is that the initial oxidation of the tertiary amino function of the D ring rarely proceeds with a high degree of regioselectivity. Namely, in addition to the desired pentacyclic substance, significant amounts of the corresponding" inside" derivatives are invariably formed. ...
