Synthesis of 7a-Substituted Hajos−Wiechert Ketone Analogues
摘要:
A general and efficient route to 2-substituted 1,3-cyclopentadiones 3 has been developed. This operationally simple, two-step procedure is amenable to mulfigram scale preparations of these useful synthetic intermediates. These compounds are then transformed to previously unknown, higher analogues of the Hajos-Parrish-Eder-Sauer-Wiechert ketone (enone 1, R = Me) following an enantioselective Robinson annulation.
The organocatalytic enantio- and diastereoselective cycloetherification of 1,3-cyclohexanedione-bearing enones involving the in situ generation of chiral cyanohydrins was developed. This transformation offers the first catalytic asymmetric approach to oxadecalin derivatives containing contiguous tetrasubstituted chiral carbons at the bridge heads of the fused ring systems. Depending on substituents
Enantioselective, Organocatalyzed, Intramolecular Aldol Lactonizations with Keto Acids Leading to Bi- and Tricyclic β-Lactones and Topology-Morphing Transformations
作者:Carolyn A. Leverett、Vikram C. Purohit、Daniel Romo
DOI:10.1002/anie.201004671
日期:2010.12.3
Quickly emerging complexity characterizes the asymmetric, nucleophile‐catalyzed aldollactonization (NCAL) process with ketoacid substrates and subsequent topology‐altering reactions. The utility of chiral cyclic isothiourea catalysts as nucleophilic promoters (Lewis bases) for desymmetrization reactions through scaleable NCAL processes is demonstrated (see picture; HBTM=homobenzotetramisole).
Molecular rearrangements. Interannular acylation of enol esters
作者:J. Correa、R. M. Mainero
DOI:10.1021/jo01259a036
日期:1969.7
Malamas, Michael S.; Hohman, Thomas C., Medicinal Chemistry Research, 1995, vol. 5, # 4, p. 245 - 254
作者:Malamas, Michael S.、Hohman, Thomas C.
DOI:——
日期:——
Synthesis of 7a-Substituted Hajos−Wiechert Ketone Analogues
作者:Jason W. J. Kennedy、Sophia Vietrich、Hilmar Weinmann、Dominic E. A. Brittain
DOI:10.1021/jo800638s
日期:2008.7.1
A general and efficient route to 2-substituted 1,3-cyclopentadiones 3 has been developed. This operationally simple, two-step procedure is amenable to mulfigram scale preparations of these useful synthetic intermediates. These compounds are then transformed to previously unknown, higher analogues of the Hajos-Parrish-Eder-Sauer-Wiechert ketone (enone 1, R = Me) following an enantioselective Robinson annulation.