Novel and Efficient Insertions of Carbons Carrying O-, S-, and N-Linked Substituents: Synthesis of α-Alkoxyalkyl, α-(Alkylthio)alkyl, and α-(Carbazol-9-yl)alkyl Ketones
作者:Alan R. Katritzky、Linghong Xie、Larisa Serdyuk
DOI:10.1021/jo960840p
日期:1996.1.1
A wide variety of benzotriazolyl-stabilized anions 2, obtained by the lithiation of 1-(alpha-alkoxyalkyl)-, 1-[alpha-(alkylthio)alkyl]-, and 1-[alpha-(carbazol-9-yl)alkyl]benzotriazoles 1, on reaction with aliphatic and aromatic aldehydes and ketones, followed by rearrangement induced by heating in the presence of zinc bromide, furnish one-carbon-homologated alpha-alkoxyalkyl, alpha-(alkylthio)alkyl
Synthesis of 5,6-dihydro-4H-pyrido[3,2,1-jk]carbazolesvia intermolecular [4+2] cycloaddition
作者:Alan R. Katritzky、Guifen Zhang、Ming Qi、Linghong Xie
DOI:10.1016/s0040-4039(97)01663-8
日期:1997.10
4-, 4,5- and 4,6-Substituted 5,6-dihydro-4H-pyrido[3,2,1-jk]carbazoles are synthesized regioselectively from carbazole by a novel, two step sequence. (C) 1997 Elsevier Science Ltd.
New Synthesis of Amines and Amides Mediated by Additions of Benzotriazole to Enamines and Enamides and Transformations of the Adducts
作者:Alan R. Katritzky、Simona Jurczyk、Bogumila Rachwal、Stanislaw Rachwal、Irina Shcherbakova、Konstantina Yannakopoulou
DOI:10.1055/s-1992-26362
日期:——
Adducts of type N-C-Bt can be obtained in which the nitrogen atom is derived from an N-vinyl non-basic heterocyclic NH compound or a secondary amide, or in which the central carbon is derived from a ketone by the addition of benzotriazole to an enamine or enamide. Thus, 9-vinylcarbazole, 1-vinylpyrrolidin-2-one and 1-(1-ethylprop-1-enyl)pyrrolidine afforded the corresponding N-(1-benzotriazolylalkyl)-substituted compounds which could be alkylated by various methods in good yield. The range of benzotriazole mediated syntheses of amines and amides is significantly extended in this way.