Synthesis and Palladium-Catalyzed Cycloaddition of the Bifunctional Conjunctive Reagent Methyl (<i>Z</i>)-1-Methyl-2-trimethylsilylmethyl-2-butenyl Carbonate
作者:Barry M. Trost、Michael C. Matelich
DOI:10.1055/s-1992-34152
日期:——
A simple synthesis of (Z)-2-trimethylsilylmethyl-2-buten-1-ol from 2-butyn-1-ol provides ready access to disubstituted bifunctional conjunctive reagents such as the title compound. Palladium(0) catalysts initiate cycloaddition to electron-deficient olefins to form methylenecyclopentanes with excellent regioselectivity.
Stereospecific synthesis of (+)- and (-)-sesbanimide A
作者:Martin J. Wanner、Nico P. Willard、Gerrit-Jan Koomen、Upendra K. Pandit
DOI:10.1016/s0040-4020(01)81662-8
日期:——
Starting from L-xylose and D-xylose derivatives, (-)-sesbanimide A and (+)-sesbanimide A, respectively, have been synthesized. The carbohydrate templates constitute ring B of the alkaloid on which the remaining two rings are constructed in the sequence B → AB → ABC.
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
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:——
Palladium-Catalyzed [3+2] Cycloaddition of Carbon Dioxide and Trimethylenemethane under Mild Conditions
作者:George E. Greco、Brittany L. Gleason、Tiffany A. Lowery、Matthew J. Kier、Lisa B. Hollander、Shoshanah A. Gibbs、Amanda D. Worthy
DOI:10.1021/ol7017246
日期:2007.9.1
with trimethylenemethane (TMM) under mild conditions (1 atm, 75 degrees C, 30 min) to produce a gamma-butyrolactone product in 63% yield, when the Pd-TMM complex is generated from 2-(acetoxymethyl)-3-(trimethylsilyl)propene. The reaction reported here is more rapid than the all-carbon [3+2] cycloaddition, and only the gamma-butyrolactone is produced in a competition experiment. With substituted substrates