Synthesis of Eight‐Membered Lactams through Formal [6+2] Cyclization of Siloxy Alkynes and Vinylazetidines
作者:An Wu、Qiang Feng、Herman H. Y. Sung、Ian D. Williams、Jianwei Sun
DOI:10.1002/anie.201902866
日期:2019.5.13
lactams through formal [6+2] cyclization of siloxyalkynes and vinylazetidines has been developed. Evidence from a chirality transfer experiment suggests that the reaction proceeds via a [3,3]‐sigmatropic rearrangement from a ketene intermediate. This insight led to the development of alternative conditions and use of acyl chlorides as ketene precursors for the [6+2] reaction with vinylazetidines.
Synthesis of β,γ-unsaturated amides via palladium-promoted coupling of organomercurials and vinylic β-lactams
作者:Richard C. Larock、Shuji Ding
DOI:10.1016/s0040-4039(00)99607-2
日期:1989.1
The reaction of aryl or vinylic mercurials, Li2PdCl4 and vinylic β-lactams affords good yields of the corresponding ring-opened β,γ-unsaturated amides.
Small rings. 29. Synthesis and ring expansion of vinylazetidines. A synthesis of hydroazocines
作者:Alfred Hassner、Norbert Wiegand
DOI:10.1021/jo00369a018
日期:1986.9
Synthesis of aryl-substituted 3-alkenamides via palladium-catalyzed cross-coupling of aryl iodides and 4-alkenyl-2-azetidinones
作者:Richard C. Larock、Shuji Ding
DOI:10.1016/s0040-4039(00)77470-3
日期:1993.2
Palladium catalyzes the cross-coupling of aryl iodides and 4-alkenyl-2-azetidinones to give good yields of aryl-substituted 3-alkenamides.
Palladium(II)-promoted cross-coupling of 4-alkenyl-2-azetidinones with organomercurials
作者:Richard C. Larock、Shuji Ding
DOI:10.1021/jo00060a024
日期:1993.4
The palladium-promoted cross-coupling of 4-alkenyl-2-azetidinones with aryl and vinylic mercurials provides 5-aryl-3-alkenamides and 3,6-alkadienamides, respectively. Modest to excellent stereoselectivity for formation of the new carbon-carbon double bond is observed. The reaction becomes catalytic in palladium when cupric chloride and oxygen are introduced. This process constitutes the first organometallic ring opening of 2-azetidinones to acyclic unsaturated amides.