Tin-Mediated Regioselective Benzylation and Allylation of Polyols: Applicability of a Catalytic Approach Under Solvent-Free Conditions
作者:Maddalena Giordano、Alfonso Iadonisi
DOI:10.1021/jo402399n
日期:2014.1.3
The first catalytic version of the stannylene-mediated benzylation and allylation of polyols is reported. The methodology is based on a simple solvent-free protocol that significantly advances, in terms of both experimental ease and synthetic scope, the applicability of tin-promoted selective protections. The described approach is indeed endowed with a very large number of advantages over routine protocols:
A catalytic monoalkylation of 1,2-diols by using a weak base has been developed. Copper(II) dichloride and boronic acids are effective catalysts for activating 1,2-diols in the presence of potassium carbonate as a base. Various 1,2-diols were selectively monoalkylated with allyl-, benzyl- and alkyl- halides in DMF by choosing a suitable catalyst for each 1,2-diols.
The present invention provides a compound having excellent histone acetyl transferase inhibitory activity against EP300 and/or CREBBP, or a pharmacologically acceptable salt thereof. The compound is represented by the following formula (1) or a pharmacologically acceptable salt thereof:
wherein ring Q
1
, ring Q
2
, R
1
, R
2
, R
3
and R
4
respectively have the same meanings as defined in the specification.
EP3643703
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A Highly Regio- and Chemoselective Reductive Cleavage of Benzylidene Acetals with EtAlCl<sub>2</sub>-Et<sub>3</sub>SiH
A highly regio- and chemoselective reductive cleavage of benzylidene acetals derived from 1,2- and 1,3-diols was achieved under mild conditions using EtAlCl2-Et3SiH reagent system in good to excellent yields. Labile protecting groups such as N-Boc, N-Cbz and -OTBDMS are found to be stable under the reaction conditions.