Development of an NH<sub>4</sub>Cl-Catalyzed Ethoxy Ethyl Deprotection in Flow for the Synthesis of Merestinib
作者:Michael O. Frederick、Joel R. Calvin、Richard F. Cope、Michael E. LeTourneau、Kurt T. Lorenz、Martin D. Johnson、Todd D. Maloney、Yangwei John Pu、Richard D. Miller、Lauren E. Cziesla
DOI:10.1021/acs.oprd.5b00240
日期:2015.10.16
An NH4Cl-catalyzedethoxyethyldeprotection was developed for the synthesis of merestinib, a MET inhibitor. Alternative reactor technologies using temperatures above the solvent boiling point are combined with this mild catalyst to promote the deprotection reaction. The reaction is optimized for flow and has been used to synthesize over 100 kg of the target compound. The generality of the reaction
Arylazo Sulfones as Nonionic Visible-Light Photoacid Generators
作者:Lorenzo Di Terlizzi、Angelo Martinelli、Daniele Merli、Stefano Protti、Maurizio Fagnoni
DOI:10.1021/acs.joc.2c01248
日期:——
The selective visible-light-driven generation of a weak acid (sulfinic acid, in nitrogen-purged solutions) or a strong acid (sulfonic acid, in oxygen-purged solutions) by using shelf-stable arylazo sulfones was developed. These sulfones were then used for the green, smooth, and efficient photochemical catalytic protection of several (substituted) alcohols (and phenols) as tetrahydropyranyl ethers or
Acetonyltriphenylphosphonium bromide in organic synthesis: An extremely efficient catalyst for the protection and deprotection of alcohols as alkyl vinyl ethers
作者:Yung-Son Hon、Chia-Fu Lee
DOI:10.1016/s0040-4039(99)00274-9
日期:1999.3
Acetonyrtriphenylphosphonium bromide (ATPB) was an extremely effective catalyst in the preparation of THP, THF, and EE ethers as well as cleavage of THP, THF, and EE ethers to the corresponding alcohols. It could be applied to 1 degrees, 2 degrees and 3 degrees alcohols and phenol. (C) 1999 Elsevier Science Ltd. All rights reserved.
Igbal, Javed; Srivastava, Rajeev Ranjan; Gupta, Kiran Bala, Synthetic Communications, 1989, vol. 19, # 5and6, p. 901 - 906
作者:Igbal, Javed、Srivastava, Rajeev Ranjan、Gupta, Kiran Bala、Khan, M. Amin
DOI:——
日期:——
Distannoxane-catalyzed cleavage of acetals and silyl ethers