Vilsmeier-Haack Reagents. Novel Electrophiles for the One-Step Formylation of<i>O</i>-Silylated Ethers to<i>O</i>-Formates
作者:Jean-Paul Lellouche、Vadim Kotlyar
DOI:10.1055/s-2004-815435
日期:——
Various O-silylated substrates were effectively converted in one-step to their corresponding O-formates using electrophilic racemic and homochiral Vilsmeier-Haack reagents. Reactivity trends of these transformations were examined that, specifically, emphasized their synthetic potential.
Selective Acetylation of Primary Alcohols: Acetyl and Formyl Transfer Reactions with Copper(II) Salts
作者:N. Iranpoor、H. Firouzabadi、M. A. Zolfigol
DOI:10.1080/00397919808007166
日期:1998.6
Abstract The efficient esterification of primary and secondary alcohols in acetic acid was achieved in the presence of Cu(NO3)2.3H2O in high yields. Selective acetylation of primary in the presence of secondary hydroxyl groups in excellent yields were performed in EtOAc. Formylation of primary and secondary alcohols was also achieved easily in ethyl formate. High retention of configuration was observed
Bi(III) SALTS AS NEW CATALYSTS FOR THE SELECTIVE CONVERSION OF TRIMETHYLSILYL AND TETRAHYDROPYRANYL ETHERS TO THEIR CORRESPONDING ACETATES AND FORMATES
作者:I. Mohammadpoor-Baltork、A. R. Khosropour
DOI:10.1081/scc-120006016
日期:2002.1
ABSTRACT Bi(III) salts such as BiCl3, Bi(TFA)3 and Bi(OTf)3 were found to be efficient catalysts for the transformation of trimethylsilyl (TMS) and tetrahydropyranyl (THP) ethers to their corresponding acetates and formates with acetic acid and ethyl formate. Selective acetylation and formylation of TMS and THP ethers of alcohols in the presence of phenolic TMS and THP ethers make this method a useful and
Preparation of formate esters from O-TBDMS/O-TES protected alcohols. A one-step conversion using the Vilsmeier-Haack complex
作者:Sylvain Koeller、Jean-Paul Lellouche
DOI:10.1016/s0040-4039(99)01453-7
日期:1999.9
O-tert-Butyldimethylsilylated (O-TBDMS) or O-triethylsilylated (O-TES) alcohols were converted in one step to their corresponding formates under Vilsmeier-Haack conditions (). The scope and limitations of this novel reaction for interconverting alcohol protecting groups are described.
Dual behavior of alcohols in iodine-catalyzed esterification under solvent-free reaction conditions
作者:Marjan Jereb、Dejan Vražič、Marko Zupan
DOI:10.1016/j.tetlet.2009.02.224
日期:2009.5
solvent-free reaction conditions (SFRCs) is described; the governing factor is the stability of the carboniumion generated from the alcohol; high concentration reaction conditions (HCRCs) or dilute solutions are much less suitable. In the case of benzylic alcohols, loss of optical activity was noted, whereas alkyl alcohols furnished a product with retention of stereochemistry.