Efficient α-alkylation and silylation of aromatic O-tert-butyldimethylsilyl ketoximes
摘要:
The a-alkylation and silylation of para substituted acetophenones, 1- and 2-indanone (O-TBS) oximes at various reaction conditions, were studied. Optimum conversions from 82% to 100% were afforded for the alkylation and silylation of these (O-TBS) ketoximes with LDA at -78 degrees C, using electrophiles, such as, methyl iodide, ethylbromide, benzyl bromide and trimethylchlorosilane. (C) 1999 Elsevier Science Ltd. All rights reserved.
Steric and electronic effects on the reduction of O-silylated aromatic ketoximes with borane
作者:Margarita Ortiz-Marciales、Dyliana Figueroa、José A López、Melvin De Jesús、Rafael Vega
DOI:10.1016/s0040-4039(00)01109-6
日期:2000.8
aniline as the principal product, up to a 95% yield in the case of the more hindered TIPS group. The 2-methoxy- and 2,4-methoxyacetophenone O-TBS oximes produced only the rearranged secondary aniline. Reduction of 1-indanone O-TBS oximes afforded only the tetrahydroquinoline, whereas the 2-indanone analog provided only 2-aminoindan.
Facile Rearrangement of <i>O</i>-Silylated Oximes on Reduction with Boron Trifluoride/Borane
作者:Margarita Ortiz-Marciales、Luis D. Rivera、Melvin De Jesús、Sandraliz Espinosa、Josúe A. Benjamin、Orlando E. Casanova、Irving G. Figueroa、Sheila Rodríguez、Wilbert Correa
DOI:10.1021/jo0516178
日期:2005.11.1
Aromatic O-triisopropylsilyl ketoximes were efficiently rearranged to cyclic and acyclic aniline derivatives on reduction with BF3-ethearate /borane. The bulk of the substituents on the silicon atom, the size of the aliphatic ring, and the presence of alkoxy substituents on the aryl group all play an important role in the aniline.
Efficient α-alkylation and silylation of aromatic O-tert-butyldimethylsilyl ketoximes
作者:Margarita Ortiz-Marciales、Melvin De Jesús、Lemuel Quiñones、Dyliana Figueroa、Yadira L. Montes、Carlos Burgos、Benjamin Moctezuma
DOI:10.1016/s0040-4020(99)00731-0
日期:1999.10
The a-alkylation and silylation of para substituted acetophenones, 1- and 2-indanone (O-TBS) oximes at various reaction conditions, were studied. Optimum conversions from 82% to 100% were afforded for the alkylation and silylation of these (O-TBS) ketoximes with LDA at -78 degrees C, using electrophiles, such as, methyl iodide, ethylbromide, benzyl bromide and trimethylchlorosilane. (C) 1999 Elsevier Science Ltd. All rights reserved.