Preparation of 2-azetidinones by cyclocondensation of carboxylic acids and imines via diphosphorustetraiodide
作者:Maaroof Zarei、Fatemeh Maaqooli
DOI:10.1080/00397911.2016.1148165
日期:2016.3.18
ABSTRACT One-pot mild synthesis of 2-azetidinones was carried out by the reaction of imines and carboxylic acids in dry dichloromethane at room temperature using diphosphorus tetraiodide. It was also applied for synthesis of 3-spiro-2-azetidinones. The synthesized compounds were characterized by analytical and spectral (infrared, 1H NMR, 13CNMR, and elemental analysis) data. GRAPHICAL ABSTRACT
An improved method for the stereoselective synthesis of β-lactams from carboxylic acids and imines
作者:Gunda I. Georg、Peter M. Mashava、Xiangming Guan
DOI:10.1016/s0040-4039(00)74832-5
日期:1991.1
Carboxylic acids activated with Mukaiyama's reagent (2-chloro-N-methylpyridinium iodide) reacted with imines to produce β-lactams in good yields and with high stereoselectivity. The utilization of three equivalents of tripropylamine as the base was necessary to obtain high chemical yield and good stereoselectivity.
Highly stereoselective synthesis of α-hydroxy β-amino acids through β-lactams: application to the synthesis of the taxol and bestatin side chains and related systems.
作者:Claudio Palomo、Ana Arrieta、Fernando P. Cossío、Jesus M. Aizpurua、Antonia Mielgo、Natalia Aurrekoetxea
DOI:10.1016/s0040-4039(00)97083-7
日期:1990.1
Formation of α-hydroxy β-lactams, followed chemical elaboration at C4 and further βlactam cleavage afforded functionalised α-hydroxy β-amino acids or their derivatives in a highly stereoselective manner.
Triphosgene, an efficient acid activator for the Staudinger reaction
作者:D Krishnaswamy、B.M Bhawal、A.R.A.S Deshmukh
DOI:10.1016/s0040-4039(99)02074-2
日期:2000.1
An efficient one-step synthesis of beta-lactams by the reaction of imines with acids in the presence of triphosgene and triethylamine has been described. (C) 2000 Elsevier Science: Ltd. All rights reserved.
Triphosgene: a versatile reagent for the synthesis of azetidin-2-ones
An efficient use of triphosgene, as an acid activator, for the synthesis of substituted azetidin-2-ones via ketene-imine cyclo-addition reaction using various acids and imines have been described. (C) 2002 Elsevier Science Ltd. All rights reserved.