Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Mark G. Steinmetz"'
Publikováno v:
Tetrahedron. 75:70-83
A naphthiothiophene-2-carboxanilide bearing a leaving group at the C-3 position undergoes efficient electrocyclic ring closure and leaving group expulsion upon direct photolysis. The reaction occurs in the triplet excited state and can be sensitized
Autor:
Mark G Steinmetz, Richard S. Givens
Publikováno v:
Photochemistry and photobiologyReferences. 97(6)
An overview of the history, mechanistic aspects, and applications is provided for p-hydroxyphenacyl (pHP) and benzoin photoremovable protecting groups, which release biologically important leaving groups upon photolysis with UV light. Also discussed
Publikováno v:
The Journal of Organic Chemistry. 83:8995-9007
The triplet excited state of thioxanthone produced by photolysis undergoes reversible triplet energy transfer with a trimethylene-linked benzothiophene-2-carboxanilide ring system. The ensuing electrocyclic ring closure of the anilide moiety produces
Publikováno v:
Organic Letters. 13:872-875
Leaving groups such as carboxylate, thiolate, and phenolate are expelled via zwitterionic intermediates produced upon photochemical electrocyclic ring closure of benzothiophene carboxanilides in the triplet excited state. Chemical yields generally ex
Publikováno v:
The Journal of Organic Chemistry. 73:8867-8879
Methacrylanilides, ArN(CH3)COC(CH2LG)=CH2, with allylic leaving groups (LG(-) = BocAla, PhCO2(-), PhCH2CO2(-), PhO(-)) undergo photochemical electrocyclic ring closure to produce a zwitterionic intermediate. Further reaction of the intermediate resul
Autor:
Mark G. Steinmetz, Yugang Chen
Publikováno v:
The Journal of Organic Chemistry. 71:6053-6060
Upon exposure to visible light, 2-pyrrolidino-substituted 3,6-dimethyl-1,4-benzoquinones photocyclize to give benzoxazolines with quantum yields of 0.07-0.10 in CH2Cl2, 0.02-0.04 in CH3CN, and0.01 in 30% aq CH3CN. With carboxylate or phenolate leavin
Publikováno v:
The Journal of Organic Chemistry. 70:4431-4442
1 2 3 a (R = Et, R' = H) 94 : 6 b (R = iPr, R' = Me) 0 : 100 c (R = Ph, R' = H) 100 : 0 LG = CH 3 CO 2 - , PhCH 2 CO 2 - , C 6 H 5 CO 2 - , 4-NCC 6 H 4 CO 2 - , CH 3 CONHCH 2 CO 2 - , BocAla, GABA, Glu In aqueous media, α-keto amides LGCH 2 COCON(R)
Publikováno v:
Tetrahedron Letters. 46:1045-1048
Time-resolved pH jump experiments, using laser flash photolysis and bromocresol green as an indicator, showed that photochemical cleavage and release of carboxylic acids from various α-keto amides derivatives in aqueous media occurs on the microseco
Publikováno v:
Tetrahedron Letters. 49:4621-4623
α,β-Unsaturated anilides bearing allylic leaving groups undergo photochemical electrocyclic ring closure to produce zwitterionic intermediates which eliminate carboxylate and phenolate leaving groups.
Publikováno v:
Journal of Organometallic Chemistry. 516:25-40
1-Methyl-1-silabicyclo[2.2.1]hept-2-ene was synthesized in 27% yield by chloramine-T oxidation of mixture of C-2/C-3 phenylselenide derivatives of 1-methyl-1-silabicyclo[2.2.1]heptane. The phenylselenides in turn were produced in 8% yield by GifIII o