The totalsynthesis of (−)‐isoschizogamine was accomplished, featuring the construction of the quaternary carbon center by the modified Johnson–Claisen rearrangement in basic media and the facile assembly of the key tetracyclic quinolone intermediate through a cascade cyclization. The characteristic cyclic aminal was constructed by late‐stage CH functionalization at the position adjacent to the lactam
Intramolecular additions of allylsilanes to conjugated dienones. The synthesis of three perforanes
作者:George Majetich、Jean Defauw、Clay Ringold
DOI:10.1021/jo00236a013
日期:1988.1
The Radical Cyclization Approach to Morphine. Models for Highly Oxygenated Ring-III Synthons
作者:Kathlyn A. Parker、Demosthenes Fokas
DOI:10.1021/jo00093a027
日期:1994.7
4-Iodo-3-methyl-2-cyclohexenone (9) and 3-alkyl 3-cyclohexene-1,2-diol derivatives 16 were examined as ring-III equivalents for the tandem radical cyclization approach to the synthesis of morphine (1a).
MAJETICH, GEORGE;DEFAUW, JEAN;RINGOLD, CLAY, J. ORG. CHEM., 53,(1988) N 1, 50-68
作者:MAJETICH, GEORGE、DEFAUW, JEAN、RINGOLD, CLAY
DOI:——
日期:——
Asymmetric synthesis of ABC tricyclic core in Daphniphyllum alkaloid 21-deoxy-macropodumine D
In this paper, we describe our efforts toward the asymmetric synthesis of Daphniphyllum alkaloid 21-deoxymacropodumine D which led to efficient preparation of a ABC tricyclic framework containing five consecutive stereocenters. This synthetic work features (1) utilization of an asymmetric conjugate addition to install the C5 all-carbon quaternary center, (2) an intramolecular aza-Michael addition followed