Rapid Sonogashira cross-coupling of iodoferrocenes and the unexpected cyclo-oligomerization of 4-ethynylphenylthioacetate
作者:Michael S. Inkpen、Andrew J. P. White、Tim Albrecht、Nicholas J. Long
DOI:10.1039/c3cc43116a
日期:——
A systematic study into the Sonogashira cross-coupling of 1,1′-diiodoferrocene (fcI2) confirms that the Pd(0)–P(tBu)3 system provides a remarkable rate increase over Pd(0)–(PPh3)2. Attempts to couple 4-ethynylphenylthioacetate (2) with fcI2 instead produced a novel cyclic trimer of the former, from syn addition of S–Ac across CC.
Metal‐Free Tunable 1,2‐Difunctionalization of Terminal Alkynes: Synthesis of β‐Substituted α,β‐Unsaturated Ketones
作者:Muneer‐Ul‐Shafi Bhat、Majid Ahmad Ganie、Bhahwal Ali Shah
DOI:10.1002/chem.202302294
日期:2023.12
A new method efficiently adds C−C and C−S bonds to terminal alkynes, allowing for accessing a range of β-substituted α,β-unsaturatedketones. The versatility of the approach lies in its ability to tune the reaction conditions to target different positions of the alkyne by switching temperature.
Synthesis of β‐Phenylchalcogeno‐α,β‐unsaturated Ketones via Hydrochalcogenation of Acetylenes using Microwave and Solvent‐Free Conditions
作者:Gelson Perin、Samuel R. Mendes、Márcio S. Silva、Eder J. Lenardão、Raquel G. Jacob、Paulo C. dos Santos
DOI:10.1080/00397910600764162
日期:2006.9
Ynones Merge Activation/Conjugate Addition of Chalcogenoborates ArE-Bpin (E=Se, S)
作者:Marc G. Civit、Xavier Sanz、Christopher M. Vogels、Carles Bo、Stephen A. Westcott、Elena Fernández
DOI:10.1002/adsc.201500650
日期:2015.10.12
The “pull–push” effect of the Bpin moiety in ArE-Bpin reagents (E=Se, S) is demonstrated by the Lewis acid interaction with the carbonyl group of ynones and the concomitant delivery of ArSe or ArS to the electron-deficient alkyne with impressive stereoselectivity. The two component reactivity is carried out in methanol to generate (Z)-β-(arylseleno)-α,β-unsaturated ketones and (Z)-β-(arylsulfuro)-α