An efficient synthesis of 4-ethyl-4-[(3-hydroxycarbonyl)propyl]dihydro-2(3H)-furanone and its use in a formal total synthesis of (±)-quebrachamine
作者:Andrew G.H. Wee、Qing Yu
DOI:10.1016/s0040-4020(98)00825-4
日期:1998.10
directly afford an epimeric mixture of the tetracyclic lactam 17a,b. Lithium aluminum hydride reduction of 17a,b provides the known tetracyclic amino alcohol 18a,b which, overall, constitutes a formal synthesis of (±)-quebrachamine.
Enantiospecific total synthesis of indole alkaloids (+)-eburnamonine, (−)-aspidospermidine and (−)-quebrachamine
作者:John Eugene Nidhiry、Kavirayani R. Prasad
DOI:10.1016/j.tet.2013.04.097
日期:2013.7
An enantiospecific totalsynthesis of indolealkaloids eburnamonine, aspidospermidine and quebrachamine is described from lactic acid. Synthesis of all three alkaloids is accomplished from a single chiral building block. Johnson–Claisen rearrangement of a chiral allyl alcohol is the main feature for the installation of the required quaternary centre.