Sensitized photooxygenations of 3-vinylindole derivatives
摘要:
A series of 1-methyl- and 1-(phenylsulfonyl)-substituted 3-vinylindoles with different electronic and steric features has been synthesized and their sensitized photooxygenation in aprotic solvents investigated. 1-Methyl-3-vinyl- (1a), 1,2-dimethyl-3-vinyl- (1b), 1-methyl-3-(beta-methoxyvinyl)- (4-Z and 4-E), 1-(phenylsulfonyl)-3-vinyl- (8a), 1-(phenylsulfonyl)-3-(alpha-methylvinyl) (8b), 1-(phenylsulfonyl)-3-(8-methoxyvinyl)- (8c and 8d), and cis-1-(phenylsulfonyl)-3-(alpha-methyl-beta-methoxyvinyl) indoles (15-Z) react with O-1(2) predominantly to give endoperoxides via [4+2] cycloaddition. However, 1,2-dimethyl-3-(beta-methoxyvinyl)indole (1c) gives [2 + 2] cycloaddition with the 3-double bond to give 1,2-dimethyl-3-formylindole (3c); trans-1-(phenylsulfonyl)-3-(alpha-methyl-beta-methoxyvinyl)indole (15-E) gives the 3-indolyl allylic hydroperoxide (17) via ene reaction, along with a small amount of isomerization of the 3-vinyl double bond. A zwitterionic intermediate in the isomerization is proposed. Most of the resulting dioxacarbazole endoperoxides are isolable and inert to reduction by trimethyl phosphite and thiourea except for N-methyldioxacarbazole 5, which undergoes clean rearrangement to indolin-2-one epoxide 7 at -20-degrees-C.
New Diels-Alder reactions of (E/Z)-2'-methoxy-substituted 3-vinylindoles with carbo- and heterodienophiles: regio- and stereoselective access to [b]-annelated indoles and functionalized or [a]-annelated carbazoles
The (E/Z)-2'-methoxy-substituted 3-vinylindoles 1a,b react with some carbo- and azodienophiles to furnish new carbazoles and pyridazinoindoles. The conservation of the E and Z stereochemistry of 1 in these Diels-Alder reactions was investigated, and a mechanistic rationalization is given for the stereoselective and regioselective results observed.
Wittig-Olefinierung zu neuen donor- und akzeptor-substituierten 3-Vinylindolen: Optimierte Syntheseverfahren
作者:Ulf Pindur、Ludwig Pfeuffer
DOI:10.1007/bf00808758
日期:1989.2
PINDUR, ULF;PFEUFFER, LUDWIG, MONATSH. CHEM., 120,(1989) N, C. 157-162
作者:PINDUR, ULF、PFEUFFER, LUDWIG
DOI:——
日期:——
PINDUR, ULF;KIM, MYUNG-HWA, CHIMIA, 44,(1990) N0, C. 339-341