Elucidation of thermal reactions by variable temperature photoelectron spectroscopy. A new synthesis of benzthiete and first direct evidence for transient benzothiete keten
作者:Reinhard Schulz、Armin Schweig
DOI:10.1016/s0040-4039(01)85468-x
日期:1980.1
An efficient synthesis of (80% yield) of benzothiete has been found and transient benzothiete ketene has been detected using the technique of variable temperature photoelectronspectroscopy.
已发现有效合成苯并噻吨(产率为80%),并已使用可变温度光电子能谱技术检测了瞬态苯并噻吨乙烯酮。
Au(I)-Catalyzed Formal Intermolecular Carbene Insertion into Vinylic C(sp<sup>2</sup>)–H Bonds and Allylic C(sp<sup>3</sup>)–H Bonds
We report a metal-catalyzed formal intermolecular carbene insertion into the vinylic C(sp2)–H bond of alkenes, wherein Au(I) proved to be more efficient than the other metal catalysts screened. This provides facile access to C4-alkenyl isochromanones and isoquinolinones from the corresponding diazo reagents and α-methylstyrenes in moderate to good yields and excellent chemoselectivity. Mechanistic
Ried,W.; Appel,H., Justus Liebigs Annalen der Chemie, 1964, vol. 679, p. 56 - 77
作者:Ried,W.、Appel,H.
DOI:——
日期:——
Maas, Gerhard; Tretter, Andreas, Liebigs Annalen der Chemie, 1985, # 9, p. 1866 - 1873
作者:Maas, Gerhard、Tretter, Andreas
DOI:——
日期:——
Reactions of 3-diazo-1,3-dihydro-2H-indol-2-one derivatives with enaminones. A novel synthesis of 1,2,3-triazoles
作者:Rodinei Augusti、Concetta Kascheres
DOI:10.1021/jo00077a030
日期:1993.12
A new and efficient method of 1,2,3-triazole synthesis is described in which these heterocyclics are formed through a novel nitrogen transfer from diazocarbonyl compounds to enaminones. Thus, the reaction of 3-diazo-1,3-dihydro-2H-indol-2-one derivatives 1 (X = NR3) and 3-diazobenzo[b]-thiophen-2(3H)-one 5 (X = S) with enaminones 2 and 7 leads to the formation of mainly 1,2,3-triazoles 4 and pyrazoloquinazolinones 3. Both the phenyl substituents (Y and Z in 1) and the nature of the X group affects the reaction rate and product distribution. Rate increases with an increase in the electron-withdrawing ability of the substituents Y and Z. The dinitro derivative 1g is shown to be the most efficient in promoting 1,2,3-triazole 4 formation while pyrazoloquinazolinones 3 are often competitively formed when other derivatives of 1 are employed.