Silylation–desilylation of propargyl amides: rapid synthesis of functionalised aldehydes and β-lactams
作者:Laura Antonella Aronica、Giulia Valentini、Anna Maria Caporusso、Piero Salvadori
DOI:10.1016/j.tet.2007.04.064
日期:2007.7
Propargyl functionalised beta-silylalkenals were easily prepared starting from suitable propargyl compounds by a silylformylation process. In particular the use of propargyl tosyl amides allowed the synthesis of alpha, beta-unsaturated aldehydes through a two-step sequence of silylformylation -desilylation reactions. TBAF was employed to induce the desilylation process that was performed under very mild experimental conditions and occurred along with an elimination step of the tosylamido moiety affording 2-methylaryl-2-alkenals with good yields and stereoselectivity. When the tosyl amides were reacted with a hydrosilane in the presence of catalytic amounts of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) alpha-silylmethylene-beta-lactams were synthesised through a silylcarbocyclisation process. A high chemoselectivity towards the b-lactam was observed when dialkyl propargyl amides were employed. The obtained b-lactams were easily transformed into the corresponding methylaryl-b-lactams by fluoride induced aryl migration -desilylation with total retention of configuration of the migrating group and complete stereoselectivity towards the more stable b-lactam (E)-isomer. (c) 2007 Published by Elsevier Ltd.
An efficient procedure for the preparation of chiral β-substituted (E)-crotylsilanes: Application of a rhodium(II) catalyzed silylformylation of terminal alkynes
作者:Nareshkumar F. Jain、Pier F. Cirillo、Jennifer V. Schaus、James S. Panek
DOI:10.1016/0040-4039(95)01894-n
日期:1995.11
β-substituted (E)-crotylsilanes (R)-7 and (S)-8, bearing an alkyl or aryl group adjacent to the stereogenic C-Si center have been synthesized in an efficient four-step procedure initiated with a regio- and stereoselective silylformylation of a terminal alkynecatalyzed by dirhodium(II) perfluorobutyrate.
Synthesis of functionalised β-lactones via silylcarbocyclisation/desilylation reactions of propargyl alcohols
作者:Laura Antonella Aronica、Caterina Mazzoni、Anna Maria Caporusso
DOI:10.1016/j.tet.2009.10.112
日期:2010.1
alkynol characterised by two alkyl groups on the propargyl carbon atom, significant amounts of the aldehydes were observed for secondary alcohols. In these cases, the use of ortho-substituted arylsilanes improved the chemoselectivity towards the α-methylene-β-lactones. Such molecules were then successfully converted into α-methylaryl-β-lactones by a fluoride-induced rearrangement of the aryl group that migrates