Hf(OTf)4 as a Highly Potent Catalyst for the Synthesis of Mannich Bases under Solvent-Free Conditions
作者:Shuai-Bo Han、Jing-Ying Wei、Xiao-Chong Peng、Rong Liu、Shan-Shan Gong、Qi Sun
DOI:10.3390/molecules25020388
日期:——
Hf(OTf)4 was identified as a highly potent catalyst (0.1–0.5 mol%) for three-component Mannich reactionunder solvent-free conditions. Hf(OTf)4-catalyzed Mannich reaction exhibited excellent regioselectivity and diastereoselectivity when alkyl ketones were employed as substrates. 1H NMR tracing of the H/D exchange reaction of ketones in MeOH-d4 indicated that Hf(OTf)4 could significantly promote the
Development of the First Brønsted Acid Assisted Enantioselective Brønsted Acid Catalyzed Direct Mannich Reaction
作者:Magnus Rueping、Erli Sugiono、Fenja Schoepke
DOI:10.1055/s-2007-980369
日期:2007.6
describe the development of the first enantioselective Bronsted acid assisted chiral Bronsted acidcatalyzed direct Mannichreaction of acetophenone with various aldimines. The reaction proceeds in the presence of a chiral and an achiral Bronsted acid which simultaneously activate the ketone and aldimine to give the corresponding p-amino ketones with good enantioselectivities and without the necessity of enolate
Ammonium Chloride Promoted One-Pot, Three-Component Mannich Reaction:
An Efficient Synthesis of β-Amino Ketones and β-Amino Esters
作者:Rekha R. Joshi、Jay Z. Chandanshive、Pradip D. Lokhande
DOI:10.14233/ajchem.2022.23978
日期:——
temperature to furnish β-amino ketones in good to excellent yields. The said protocol was further applied for the directsynthesis of β-amino esters, which are important precursors for the synthesis of β-amino acids. This protocol is potentially applicable for the development of a clean and environment-friendly strategy for the synthesis of β-amino ketones and found applications in the synthesis of potent biologically
NONSTEROIC ANDROGEN ACCEPTOR REGULATORS, PREPARATION PROCESS, PHARMACEUTICAL COMPOSITION AND USE THEREOF
申请人:Shanghai Institute of Materia Medica,
Chinese Academy of Sciences
公开号:EP1889829A1
公开(公告)日:2008-02-20
Nons-teroidal androgen receptor modulating compounds of the general formula (I), their pharmaceutically acceptable salts, preparation process and pharmaceutically compositions containing the said compounds are disclosed. Such compounds of the general formula (I) or their pharmaceutically acceptable salts can be used for preparing non-steroidal medicines to treat and/or prevent condictions or diseases such as prostatic hyperplasia, prostate cancer, hirsutism, severe hormone-dependent alopecia or acne, etc. as a result of androgen receptor antagonistic activities.