Intramolecular addition reactions of carbonyl ylides formed during photocyclization of aryl vinyl ethers
摘要:
Photocyclization of aryl vinyl ethers reportedly proceeds via carbonyl ylide intermediates. The photochemical behavior of several aryl vinyl ethers, which incorporate a pendant alkene side chain, was explored. Naphthyl vinyl ethers 1c and 1d provided products that are consistent with photocyclization and subsequent intramolecular ylide-alkene addition. Product distribution is influenced by solvent and temperature effects. Thus, irradiation of 1c in toluene provides 9a in 87% yield. However, irradiation of 1c in methanol/toluene (1:1) provides 3c (45%), 11 (24%), and 12 (23%). Product 12 results from photoinitiated intramolecular [2 + 2] cycloaddition of the butenoate ester side chain to the naphthalene system.
Intramolecular addition reactions of carbonyl ylides formed during photocyclization of aryl vinyl ethers
摘要:
Photocyclization of aryl vinyl ethers reportedly proceeds via carbonyl ylide intermediates. The photochemical behavior of several aryl vinyl ethers, which incorporate a pendant alkene side chain, was explored. Naphthyl vinyl ethers 1c and 1d provided products that are consistent with photocyclization and subsequent intramolecular ylide-alkene addition. Product distribution is influenced by solvent and temperature effects. Thus, irradiation of 1c in toluene provides 9a in 87% yield. However, irradiation of 1c in methanol/toluene (1:1) provides 3c (45%), 11 (24%), and 12 (23%). Product 12 results from photoinitiated intramolecular [2 + 2] cycloaddition of the butenoate ester side chain to the naphthalene system.
Photochemistry of Aryl Vinyl Sulfides and Aryl Vinyl Ethers: Evidence for the Formation of Thiocarbonyl and Carbonyl Ylides
作者:James P. Dittami、Yalin Luo、David Moss、W. Grant McGimpsey
DOI:10.1021/jo9604649
日期:1996.1.1
Arylvinyl thioethers 5a and 9a and arylvinyl ethers 5b and 9b form ylide intermediates following laser irradiation at 308 nm. In benzene, the ylides possess long-lived absorption bands in the 600-800 nm region with a second weaker band at approximately 460 nm. In methanol, a known quencher of zwitterionic species, the lifetimes are reduced significantly. The decay kinetics measured within the long
Intramolecular addition reactions of carbonyl ylides formed during photocyclization of aryl vinyl ethers
作者:James P. Dittami、Xiao Yi Nie、Hong Nie、H. Ramanathan、Scott Breining、Jon Bordner、Debra L. Decosta、Jeffrey Kiplinger、Philip Reiche、Richard Ware
DOI:10.1021/jo00019a020
日期:1991.9
Photocyclization of aryl vinyl ethers reportedly proceeds via carbonyl ylide intermediates. The photochemical behavior of several aryl vinyl ethers, which incorporate a pendant alkene side chain, was explored. Naphthyl vinyl ethers 1c and 1d provided products that are consistent with photocyclization and subsequent intramolecular ylide-alkene addition. Product distribution is influenced by solvent and temperature effects. Thus, irradiation of 1c in toluene provides 9a in 87% yield. However, irradiation of 1c in methanol/toluene (1:1) provides 3c (45%), 11 (24%), and 12 (23%). Product 12 results from photoinitiated intramolecular [2 + 2] cycloaddition of the butenoate ester side chain to the naphthalene system.