1-t-Butyldimethylsiloxy-8,11,11-trimethylbicyclo[5.3.1]undec-7-en-9-one (2) has been synthesized via intramolecular aldol condensation of the precursor 3 by combined use of lithium diisopropylamide (LDA) and CeCl3. The dicarbonyl compound 3 was prepared by allylation of 8-membered ring ketone 6b.
Conversion of Torgov's Synthesis of Estrone into a Highly Enantioselective and Efficient Process
作者:Yeung、Rong-Jie Chein、E. J. Corey
DOI:10.1021/ja0742434
日期:2007.8.1
A very direct and efficient conversion of the achiral Torgov diketone into the natural form of O-methyl estrone is described.
描述了将非手性 Torgov 二酮非常直接和有效地转化为 O-甲基雌酮的天然形式。
Construction of AB-Ring System of Taxane Framework by A-Ring Annulation Strategy: Synthesis of 1-Hydroxy-8,11,11-trimethylbicyclo-(5.3.1)undec-7-en-9-one by Way of Intramolecular Aldol Cyclization to Form the C1-C10 Bond.
作者:Koji YAMADA、Hayato IWADARE、Teruaki MUKAIYAMA
DOI:10.1248/cpb.45.1898
日期:——
Construction of the AB-ring system of the taxane framework via an A-ring annulation strategy was demonstrated by base-mediated intramolecular aldol reaction of (Z)-2,2-dimethyl-3-(1-methyl-2-oxopropylidene)cyclooctanone, affording the title compound, 1-hydroxy-8,11,11-trimethylbicyclo[5.3.1]undec-7-en-9-one. A cyclization precursor, the tetra-substituted (Z)-alkene, was prepared from the corresponding