Methylenecyclopropanecarboxylates and -dicarboxylates, efficient reagents for the [3 + 2] methylenecyclopentane annulation of unactivated and electron-rich alkenes
作者:Daniel A. Singleton、Chad C. Huval、Kevin M. Church、E.Scott Priestley
DOI:10.1016/s0040-4039(00)93550-0
日期:1991.10
The readily available methylenecyclopropanes 1 and 2 efficiently annulate unactivated and electron rich alkenes via a thiyl-radical catalyzed chain cyclization.
易于获得的亚甲基环丙烷1和2通过噻吩基自由基催化的链环化有效地使未活化的和富电子的烯烃环化。
The effect of the diethylphosphonate group on free radical stabilities
The diethylphosphonate substituent is freeradical stabilizing by a conjugation mechanism as judged by its effect on the rate of the methylenecyclopropane rearrangement.
通过其对亚甲基环丙烷重排速率的影响判断的共轭机制,二乙基膦酸酯取代基是自由基稳定的。
Synthesis of β,γ-Unsaturated Lactams via a Magnesium Iodide Promoted Ring Expansion of Secondary Methylenecyclopropyl Amides
作者:Mark E. Scott、Christina A. Schwarz、Mark Lautens
DOI:10.1021/ol0621957
日期:2006.11.1
A novel and efficient route to exo-beta,gamma-unsaturated lactams from substituted and non-substituted secondary methylenecyclopropyl amides is reported. Subsequent modification of the resulting exo-beta,gamma-unsaturated lactams provides access to several pharmaceutically relevant scaffolds. [reaction: see text].
A conjunctive diquinane synthesis using a free-radical catalyzed intramolecular [3 + 2] methylenecyclopentane annulation
作者:Chad C. Huval、Daniel A. Singleton
DOI:10.1016/s0040-4039(00)75791-1
日期:1994.1
Alkylation of the methylenecyclopropane 1 with 4-alkynyl iodides followed by a free-radical mediated intramolecular methylenecyclopentaneannulation composes a quick and efficient new diquinane synthesis.