The Chemistry of Chalcones; IV1. Addition of 2-Mercaptobenzoic Acid to Chalcones and Cyclization of the Adducts to 4b, 10-Dihydrobenzo[b]indeno[2,1-e]thiapyranones
Behaghel; Ratz, Chemische Berichte, 1939, vol. 72, p. 1257,1269
作者:Behaghel、Ratz
DOI:——
日期:——
Sequential One-Pot InBr<sub>3</sub>-Catalyzed 1,4- then 1,2-Nucleophilic Addition to Enones
作者:Marco Bandini、Pier Giorgio Cozzi、Massimo Giacomini、Paolo Melchiorre、Simona Selva、Achille Umani-Ronchi
DOI:10.1021/jo0163243
日期:2002.5.1
Low sensitivity toward traces of moisture and high tolerance of different functional groups make indium tribromide suitable for carrying out multistep synthetic sequences. In particular, we have realized a 1,4-conjugated addition of indoles/thiols to alpha,beta-unsaturated ketones mediated by a catalytic amount (10 mol %) of InBr3 obtaining the desired beta-substituted ketones in good yields. The Lewis acidity of indium salts was not affected by coordinating and acid nucleophiles; therefore, the subsequent catalytic 1,2-addition of Me3SiCN to carbonyl compounds can be performed in one pot. With the optimized atom-efficient protocol, several polyfunctionalized alpha-silyloxy cyanchydrins were synthesized in good to excellent yields (up to 97%) and a notable level of simple 1,3-diastereoselection (up to 84:16) was recorded in the case of 2-cyclohexen-1-one 2c.
Synthesis of carboxylic acid derivatives of dihydrochalcones
作者:Albert L�vai
DOI:10.1007/bf00815173
日期:——
Reaction of chalcones 1-8 with thioglycolic acid, 3-mercaptopropionic acid or thiosalicylic acid gives dihydrochalcone derivatives 9-23.
LEVAI, ALBERT, MONATSH. CHEM., 122,(1991) N-2, C. 127-129
作者:LEVAI, ALBERT
DOI:——
日期:——
MIREK, J.;MIARA, Z., SYNTHESIS, BRD, 1981, N 12, 979-980