Catalytic Cage Formation via Controlled Dimerization of Norbornadienes: An Entry to Functionalized HCTDs (Heptacyclo[6.6.0.0<sup>2,6</sup>.0<sup>3,13</sup>.0<sup>4,11</sup>.0<sup>5,9</sup>.0<sup>10,14</sup>]tetradecanes)
作者:Hee Nam Lim、Guangbin Dong
DOI:10.1021/acs.orglett.6b00207
日期:2016.3.4
A general and practical catalytic method has been developed for the rapid synthesis of HCTD (heptacyclo[6.6.0.02,6.03,13.04,11.05,9.010,14]tetradecanes) and various new 7,12-disubstituted HCTDs from norbornadienes. Compared to the known approaches, this new protocol avoids stoichiometric metals, utilizes commercially available reagents as catalysts, and affords higher yields and significantly improved
Novel Ruthenium Complex-Catalyzed Dimerization of 2,5-Norbornadiene to Pentacyclo[6.6.0.0<sup>2,6</sup>.0<sup>3,13</sup>.0<sup>10,14</sup>]tetradeca-4,11-diene Involving Carbon−Carbon Bond Cleavage
Bicyclo[2.2.1]hepta-2,5-diene (2,5-norbornadiene) dimerizes in the presence of a catalytic amount of Ru(1-2:5-6-η-cyclooctadiene)(1-6-η-cyclooctatriene) (Ru(cod)(cot)) and an electron-deficient olefin such as N,N-dimethylacrylamide, dimethyl fumarate, or dimethyl maleate in toluene or tetrahydrofuran (THF) to give a new compound, pentacyclo[6.6.0.02,6.03,13.010,14]tetradeca-4,11-diene (PCTD), in high