Synthesis of 2-aryl-2,3-dihydro-4-styrylpyrimidodiazepines in the reaction of 4,5,6-triaminopyrimidine and 2,4,5,6-tetraaminopyrimidine with diarylidenacetones
obtained in the reaction of 2,4,5,6-tetraaminopyrimidine 1a and 4,5,6-triaminopyrimidine 1b with one equivalent of the diaryli dene acetones 2 in absolute ethanol with acetic acid as the catalyst. Structure analysis of 6-amino and 6,8-diamino-2-aryl-2,3-dihydro-4-styryl-1H-pyrimido[4,5-b][1,4]diazepines 3a-i, determined by detailed nmr measurements, reveals a high regioselectivity of this reaction.
在2的反应中,获得了新的6-氨基和6,8-二氨基-2-芳基-2,3-二氢-4-苯乙烯基-1 H-嘧啶基[4,5- b ] [1,4]二氮杂s。 4,5,6-四氨基嘧啶1a和4,5,6-三氨基嘧啶1b,在无水乙醇中一当量的二芳基癸二酮丙酮2,以乙酸为催化剂。6-氨基和6,8-二氨基-2-芳基-2,3-二氢-4-苯乙烯基-1 H-嘧啶基[4,5- b ] [1,4]二氮杂卓3a-i的结构分析,通过详细的核磁共振测量表明,该反应具有很高的区域选择性。
Non-linear optics
申请人:Imperial Chemical Industries PLC
公开号:US04992203A1
公开(公告)日:1991-02-12
Optical elements having non-linear optical properties comprising a compound of the formula: ##STR1## wherein D is an electron donor A is an electron acceptor; and W, X, Y and Z are each independently H or any group capable of attachment to the pyrazolyl ring; in which the molecules of the compound are aligned so that the element has a net non-centrosymmetry, a method for their preparation, optical devices comprising such elements, and compounds of formula I.
Hydrogenation Involving Two Different Proton- and Hydride-Transferring Reagents through Metal–Ligand Cooperation: Mechanism and Scope
作者:Rahul Daga Patil、Manali Dutta、Sanjay Pratihar
DOI:10.1021/acs.organomet.2c00229
日期:2022.9.12
unsaturated carbonyl/nitro to saturated carbonyl/nitro using hydride and proton transfer from two different sources (silane for hydride and methanol for proton) via substrate-mediated interconvertible coordination modes (imino N → Ru and amido N–Ru) of the active catalyst. Remarkably, the generation of Ru–H and the presence of N–H of the coordinated BiBzImH2 are important for the generation of interconvertible