Mercuric trifluoroacetate mediated brominative cyclizations of dienes. Total synthesis of dl-3.beta.-bromo-8-epicaparrapi oxide
作者:Thomas R. Hoye、Mark J. Kurth
DOI:10.1021/jo01334a003
日期:1979.9
Ohloff; Schade, Chemische Berichte, 1958, vol. 91, p. 2017,2023
作者:Ohloff、Schade
DOI:——
日期:——
Total synthesis of (.+-.)-velloziolone.
作者:Barry B. Snider、Brad O. Buckman
DOI:10.1021/jo00044a024
日期:1992.8
The first total synthesis of the 9,10-seco-kaurene velloziolone (3) has been accomplished using an atom transfer tandem free-radical cyclization to prepare the 6-methylenebicyclo[3.2.1]octan-2-one moiety. The known diol 11 is converted to iodo acetate 10 in three steps. Alkylation of beta-keto ester 22 with 10 affords 33 that is converted to alpha-iodo ketone 7 in one pot by silylation, followed by palladium-catalyzed decarboxylation to give the tetra-substituted silyl enol ether regiospecifically and iodination of the enol ether. Atom transfer cyclization at 150-degrees-C, but not at 25 or 85-degrees-C, provides a mixture of bicyclic iodides. Elimination of HI and hydrolysis of the acetate furnishes velloziolone.