Obtention du bicyclo [6.1.0] nonene-1(9), du tricyclo [4.3.0.0 2,9 ] nonane et du cyclononyne comme produits majoritaires par photolyse directe。获得 par photolyse sensibilisee du tricyclo [4.3.0.0 2,9 ] nonane, du bicyclo [4.3.0] nonene-1(9), du cis-bicyclo [4.3.0] nonene-2 et du bicyclo [4.3.0]壬烯-1(2)。机制
Tin for Organic Synthesis, 14. Synthesis of Aromatic and α,β‐Unsaturated Aldehydes by a Friedel‐Crafts‐like Electrophilic Destannylation Using 1,1‐Dichloromethyl Methyl Ether
作者:Michael Niestroj、Wilhelm P. Neumann†
DOI:10.1002/cber.19961290111
日期:1996.1
for the preparation of a variety of aromatic (7a–m), heteroaromatic (7n–r), and α,β-unsaturated aldehydes (8a–f) is described. The reaction of trialkylaryl- (2a–o), heteroaryl- (2p–t), and 1-alkenylstannanes (4a–f and 5a–f) with dichloromethylmethylether (1, DCME) in the presence of aluminium trichloride followed by hydrolysis provides the corresponding aldehydes. In the case of arylstannanes the ipso-isomers
An Efficient Procedure for Palladium-Catalyzed Hydroformylation of Aryl/Enol Triflates
作者:Hiyoshizo Kotsuki、Probal Kanti Datta、Hitoshi Suenaga
DOI:10.1055/s-1996-4246
日期:1996.4
An efficient method for hydroformylation of aryl and enol trifluoromethanesulfonates is presented. Their reaction with carbon monoxide, trioctylsilane, and triethylamine in the presence of a catalytic amount of palladium acetate and 1,3-bis(diphenylphosphanyl)propane proceeds efficiently to provide a variety of aromatic and α,β-unsaturated aldehydes.
Saegusa Oxidation of Enol Ethers at Extremely Low Pd-Catalyst Loadings under Ligand-free and Aqueous Conditions: Insight into the Pd(II)/Cu(II)-Catalyst System
作者:Quan Zhu、Yunsong Luo、Yongyan Guo、Yushun Zhang、Yunhai Tao
DOI:10.1021/acs.joc.0c02987
日期:2021.4.16
system of Saegusa oxidation, which converts enolethers to the corresponding enals with a number of diverse substrates at extremely low catalyst loadings (500 mol ppm) under ligand-free and aqueous conditions, is described. Its synthetic utility was demonstrated by large-scale applications of the catalyst system to important nature molecules. This work allows Saegusa oxidation to become a highly practical
Compounds of general formula (1)
R1—X1—W—X2—Z1—Z2—R2
or salts thereof, exhibiting preventive and therapeutic effects against HIV infectious diseases wherein R1 is an optionally substituted five- or six-membered ring group; X1 is a free valency or the like; W is a divalent group represented by, e. g., general formula (2)
(wherein A and B are each an optionally substituted five- to seven-membered ring; E1 and E4 are each optionally substituted carbon or the like; E2 and E3 are each oxygen or the like; and a and b are each a single bond or a double bond); X2 is a divalent group constituting a straight chain moiety; Z1 is a divalent cyclic group or the like; Z2 is a free valency or the like; and R2 is optionally substituted amino or the like.
α,β-Epoxy Sulfoxides as Useful Intermediates in Organic Synthesis. X. An Improved Synthesis of α,β-Unsaturated Carbonyl Compounds from Carbonyl Compounds with Carbon Homologation through α,β-Epoxy Sulfoxides
derived fromketones and chloromethyl phenyl sulfoxide or 1-chloroalkyl phenyl sulfoxides with lithium perchlorate in the presence of tributylphosphine oxide in toluene at 110 °C for about 1–3 h gave α,β-unsaturated aldehydes or α,β-unsaturated ketones in high yields. In contrast to these results, the α,β-epoxy sulfoxides derived from aldehydes did not give the desired α,β-unsaturated ketones. In this