Bis-Suzuki reactions of 2,3-dihaloindoles. A convenient synthesis of 2,3-diarylindoles
作者:Yanbing Liu、Gordon W Gribble
DOI:10.1016/s0040-4039(00)01564-1
日期:2000.11
A convenient, one-pot synthesis of 2,3-diarylindoles 4 is described via a bis-Suzuki palladium-catalyzedcrosscoupling of 2,3-dihalo-1-(phenylsulfonyl)indoles 1 with arylboronicacids 2, followed by cleavage of the N-protecting group to give 4. The anti-inflammatory drug indoxole (4c) is prepared in high yield.
Preparation of Highly Functionalized Heterocyclic Zinc Organometallics via a Li(acac)-Catalysis of the I/Zn-Exchange Reaction
作者:Paul Knochel、Liu-Zhu Gong
DOI:10.1055/s-2004-837206
日期:——
of Li(acac) in NMP with various functionalized heterocyclic iodides provides new polyfunctional diheteroarylzincs, which undergo smooth Negishicross-coupling reactions and CuCN.2LiCl-catalyzed allylation reactions under mild conditions. Remarkably, even an aldehyde function can be present in the diorganozinc reagents.
Selective Functionalization in Positions 2 and 3 of Indole via an Iodine−Copper Exchange Reaction
作者:Xiaoyin Yang、Andreas Althammer、Paul Knochel
DOI:10.1021/ol049498q
日期:2004.5.1
Two selectively successive I/Cu exchange reactions performed with (Nphyl)CuLi allow the functionalization of indoles in positions 2 and 3. The 2,3-diketones prepared by this method can readily be converted to tricyclic heterocycles by standard methods.
The treatment of 1-methylindole-2,3-dicarboxylic acid with hypervalentiodine(III) reagent, phenyliodine diacetate (PI-DA), in the presence of lithium bromide gave 1-methyl-3,3-dibromooxindole. However, the reaction of 1-(phenylsulfonyl)indole-2,3-dicarboxylic acid with PIDA in the presence of lithium bromide afforded 2,3-dibromo-1-(phenylsulfonyl)indole. In a similar manner, the 2,3-dichloro- and
Preparation and Reactions of Functionalized Organocopper Reagents
作者:Paul Knochel、Xiaoyin Yang
DOI:10.1055/s-2006-942496
日期:2006.8
Functionalized organocopper reagents have been prepared via an iodine-copper exchange by the reaction of aryl or alkenyl iodides with a sterically hindered cuprate reagent, lithium dineophylcuprate [(Me 2 PhCCH 2 ) 2 CuLi]. The resulting copperreagents react readily with various electrophiles leading to polyfunctionalized molecules. This method represents a unique protocol for the preparation of aryl-