Alkene Difunctionalization Triggered by a Stabilized Allenyl Radical: Concomitant Installation of Two Unsaturated C−C Bonds
作者:Yunlong Wei、Hong Zhang、Xinxin Wu、Chen Zhu
DOI:10.1002/anie.202106145
日期:2021.9.6
Radical-mediated difunctionalization of alkenes provides a promising approach to introduce one alkenyl or alkynyl group to target compounds. However, simultaneous installation of two unsaturated C−C bonds via alkene difunctionalization remains elusive, attributable to the high instability and transient lifetimes of alkenyl and alkynyl radicals. Herein, we report the photocatalytic 1,2-alkynylalkenylation and
A mild and efficient method for the synthesis of functionalized 1,5-dien-3-ynes from 1,3-diynes under PdII catalysis is described. The process allows quick and atom-economical assembly of various dihalo-, haloacyl-, and diacyl-substituted 1,5-dien-3-ynes in high yields. The switch of selectivity in the formation of these dienyne products can be controlled by the choice of catalysis system and reaction
Hypoiodous acid initiated rearrangement of tertiary propargylic alcohols to α-iodoenones
作者:Wesley J. Moran、Arantxa Rodríguez
DOI:10.1039/c2ob26360b
日期:——
In the presence of an oxidant, sodium iodide is converted into hypoiodous acid which effects the rearrangement of tertiary propargylic alcohols to α-iodoenones in good yields.
在氧化剂存在下,碘化钠转化为 次碘酸 从而以高收率将叔炔丙醇重排为α-碘烯。
Synthesis of α-Acyloxy-α′-hydroxy Ketones via Cyclic Carbonate Intermediates Generated from Tertiary Bromopropargylic Alcohols and Cs<sub>2</sub>
CO<sub>3</sub>
作者:Olesya A. Shemyakina、Ol'ga G. Volostnykh、Anton V. Stepanov、Igor' A. Ushakov
DOI:10.1002/ejoc.201901226
日期:2019.11.14
The Cs2CO3‐promoted synthesis of α‐acyloxy‐α′‐hydroxy ketones is reported, in which tertiary bromopropargylic alcohols undergo hydration/acylation with carboxylic acids via in situ formation of cyclic carbonates.
据报道,Cs 2 CO 3促进了α-酰氧基-α'-羟基酮的合成,其中叔溴炔丙醇通过原位形成环状碳酸酯与羧酸水合/酰化。
A systematic study on the Cadiot–Chodkiewicz cross coupling reaction for the selective and efficient synthesis of hetero-diynes
作者:Bhavani Shankar Chinta、Beeraiah Baire
DOI:10.1039/c6ra07308e
日期:——
99% selectivity for cross coupling. Excellent yields (upto 94%). Low basic reaction medium, high functional group tolerance. Use of green solvent water.