The energy of activation for ring-closure of ground state triplet trimethylenemethane (I) to methylenecyclopropane has been measured by following the rate of dissappearance of the electron spin resonance spectrum over the temperature range –155° to –140°, in a series of frozen solid matrices. The experiments described make use of 3-methylenecyclobutanone and methylenecyclopropane as precursors to
Early Amidation Approach to 3-[(4-Amido)pyrrol-2-yl]-2-indolinones
作者:Jerad M. Manley、Monica J. Kalman、Brian G. Conway、Cynthia C. Ball、Jeffrey L. Havens、Rajappa Vaidyanathan
DOI:10.1021/jo034304q
日期:2003.8.1
A new synthesis of 3-[(4-amido)pyrrol-2-yl]-2-indolinones has been developed, where the amide side chain was installed prior to pyrrole formation. This strategy precludes the need to use any coupling reagents to install the amide side chain. This process includes a zinc-free alternative to the Knorr pyrrole synthesis.
Trimethylenemethane. Trapping with butadiene, dimerization, and ring closure
作者:Paul Dowd、Gouri Sengupta、Krishna Sachdev
DOI:10.1021/ja00722a031
日期:1970.9
Maier, Guenther; Reisenauer, Hans Peter; Lanz, Klaus, Angewandte Chemie, 1993, vol. 105, # 1, p. 119 - 121
作者:Maier, Guenther、Reisenauer, Hans Peter、Lanz, Klaus、Tross, Ralf、Juergen, Dorothee、et al.