Microbiological degradation of sterol side chains to a 17-keto group
申请人:Schering Aktiengellschaft
公开号:US04179336A1
公开(公告)日:1979-12-18
The side chains of sterols are degraded by fermentation with microorganisms capable of doing so in an improved manner by employing in such fermentations sterol derivatives of the formula ##STR1## wherein n is 1 or 2; R.sub.1 is H or lower alkyl, R.sub.2 is alkyl, whose chain optionally is interrupted by an oxygen atom, or when n is 2, also a hydrogen atom; and R.sub.3 is a sterol side chain.
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
Tetrahydropyranylethers (THP groups) and 1-ethoxyethyl ethers (EE groups) are removed upon refluxing in 95% EtOH or Me2CO–H2O (95:5) in the presence of a catalytic amount of copper(II) chloride dihydrate (2–5 mol%).
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.
Vasickova, Sona; Pouzar, Vladimir; Cerny, Ivan, Collection of Czechoslovak Chemical Communications, 1986, vol. 51, # 1, p. 90 - 100
作者:Vasickova, Sona、Pouzar, Vladimir、Cerny, Ivan、Drasar, Pavel