Diastereoselective heterogeneous catalytic hydrogenation of Baylis–Hillman adducts
摘要:
We describe herein our results concerning a highly diastereoselective heterogeneous hydrogenation of Baylis-Hillman adducts obtained from aromatic aldehydes. The results obtained are complementary to those already described for homogeneous catalytic hydrogenation reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.
A FACILE CONVERSION OF THE BAYLIS-HILLMAN ADDUCTS INTO TRIMETHYLSILYL ETHERS WITH HEXAMETHYLDISILAZANE CATALYSED BY IODINE
摘要:
The hydroxy group of the Baylis-Hillman adducts was protected with trimethylsilyl (TMS) group using the reaction of adducts la-h with hexamethyldisilazane (HMDS) catalyzed by iodine under nearly neutral reaction conditions.
structurally different types of amino acid derivatives via chemodivergent [3+2] cycloadditionreactions and tandem conjugate addition‐elimination reaction respectively. The resulting and structurally divergent enantioenriched amino acid derivatives that contain four contiguous stereogenic centers and an all‐carbon quaternary center were obtained with up to 99% ee with >95:1 dr and good yields.
A FACILE CONVERSION OF THE BAYLIS-HILLMAN ADDUCTS INTO TRIMETHYLSILYL ETHERS WITH HEXAMETHYLDISILAZANE CATALYSED BY IODINE
作者:Manouchehr Mamaghani、Abed Badrian
DOI:10.1080/10426500490459803
日期:2004.6
The hydroxy group of the Baylis-Hillman adducts was protected with trimethylsilyl (TMS) group using the reaction of adducts la-h with hexamethyldisilazane (HMDS) catalyzed by iodine under nearly neutral reaction conditions.
Highly atom economical uncatalysed and I2-catalysed silylation of phenols, alcohols and carbohydrates, using HMDS under solvent-free reaction conditions (SFRC)
作者:Marjan Jereb
DOI:10.1016/j.tet.2012.03.040
日期:2012.5
An uncatalysed silylation of phenols, regardless on the aggregate state and nature of the substituents with 0.55 equiv of HMDS under solvent-free reaction conditions (SFRC) at room temperature is reported. Sterically hindered phenols, carbohydrates and most of the alcohols additionally required a catalytic amount (up to 2 mol%) of iodine. The reaction protocol is very simple; obtaining a pure product, particularly of uncatalysed reactions, was frequently a completely solvent-free process. (C) 2012 Elsevier Ltd. All rights reserved.
Diastereoselective heterogeneous catalytic hydrogenation of Baylis–Hillman adducts
作者:Cristiano R Mateus、Wanda P Almeida、Fernando Coelho
DOI:10.1016/s0040-4039(00)00258-6
日期:2000.4
We describe herein our results concerning a highly diastereoselective heterogeneous hydrogenation of Baylis-Hillman adducts obtained from aromatic aldehydes. The results obtained are complementary to those already described for homogeneous catalytic hydrogenation reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.