that attractive dispersion forces may be responsible for a change of the binding mode. The catalytic [2+2] photocycloaddition was shown to proceed on the triplet hypersurface with a quantum yield of 0.05. The positive effect of Lewis acids on the outcome of a given intramolecular [2+2] photocycloaddition was illustrated by optimizing the key step in a concise total synthesis of the sesquiterpene (±)‐italicene
Reductive Alkylation of Alkenyl Acetates with Alkyl Bromides by Nickel Catalysis
作者:Rong‐De He、Yunfei Bai、Guan‐Yu Han、Zhen‐Zhen Zhao、Xiaobo Pang、Xiaobo Pan、Xue‐Yuan Liu、Xing‐Zhong Shu
DOI:10.1002/anie.202114556
日期:2022.1.21
A new C−C bond-forming reaction between alkenyl acetates and alkyl bromides was achieved by reductive nickel catalysis. This method offers very mild reaction conditions for facile and precise synthesis of structurally versatile aliphatic alkenes using readily available and stable alkenyl reagents. It allows for a gram-scale reaction and modification of biologically active molecules, and it affords
Total Synthesis of (±)-α-Acoradiene<i>via</i>Intramolecular Photoaddition and Reductive Cyclobutane Cleavage
作者:Wolfgang Oppolzer、Freddy Zutterman、Kurt Bättig
DOI:10.1002/hlca.19830660213
日期:1983.3.16
(±)-α-Acoradiene (4) has been synthesized from 3-methoxy-2-cyclohexenone by a sequence of 8 steps. The key steps (Scheme 6) are the regio- and stereoselective photo[2+2]addition 76 and the reductive fragmentation 65.
A new approach to spirosesquiterpenes of the acorane family
作者:Duc Do Khac Manh、Jules Ecoto、Marcel Fetizon、Henri Colin、Jose-Carlos Diez-Masa
DOI:10.1039/c39810000953
日期:——
Intramolecular [2 + 2] photocycloaddition of 3-(1,5-dimethylhex-4-enyl)cyclohex-2-enone leads to a major intermediate which can be converted into the noracorenone system (5), via a Norrish type II fission; Lewis acid (Ag+) treatment of the isopropenyl group transformed (5) into the isomeric spiro[4.5]decane system (7)
A multistep rearrangement from 2,2-disubstituted-1,3-cyclohexanediones to 3-substituted 2-cyclohexenones via phosphonate anions and its application to a formal synthesis of (.+-.)-.alpha.-acoradiene