Preparation and Intramolecular Cyclization of Bis(carbodiimides). Synthesis and X-ray Structure of 1,3-Diazetidine-2,4-diimine Derivatives
摘要:
Aza-Wittig reactions of bis(iminophosphorane) 1 derived from 2,2'-diazidobiphenyl with aromatic isocyanates provided dibenzo[d,f]-1,3-diazetidino[1,2-a]diazepine derivatives 2 in moderate yields. Similar results can be achieved from the reaction of 2,2'-bis(isothiocyanato)biphenyl 4 with aryliminophosphoranes. Treatment of bis(isothiocyanate) 4 with arylamines and further dehydrosulfurization of the resulting bis(thioureas) leads to the seven-membered ring guanidines 8. N-2-(2'-Azido)biphenyI-N'-arylcarbodiimides 13 react with 1 equiv of triphenylphosphane to give zwitterionic compounds 15, which undergo either hydrolytic cleavage to afford the guanidines 8 or react with 1 equiv of aromatic isocyanates to provide 2. Cross-experiments suggest that the: conversion 15 --> 2 takes place through a nonisolable bis(carbodiimide) that undergoes an intramolecular [2 + 2] cycloaddition at the final step. The reaction of bis(iminophosphorane) 1 with an excess of carbon dioxide leads to a mixture of the tricyclic 1,3-diazetidine derivative 6 and the 14-membered cyclic bis(carbodiimide) 23, which decomposes by thermal treatment. Compound 6 can also be obtained along with the seven-membered cyclic urea derivatives 24 from the reaction of bis(iminophosphorane) 1 with the carbon dioxide source Boc(2)O/DMAP system. A comprehensive mechanistic scheme for the aza-Wittig reactions studied is conveniently presented. The molecular and crystal structures of 1-(4-methoxyphenyl)-2-(4-methoxyphenyl)iminodibenzo[d,f]-1,3-diazetidino-[1,2-a]diazepine (2c) and [a,c]bis[dibenzo[d,f][1,3]diazepino]-1,3]diazepino]-1,3-diazetidine (6) have been determined by X-ray analysis.
TfOH-Promoted Transition-Metal-Free Cascade Trifluoroethylation/Cyclization of Organic Isothiocyanates by Phenyl(2,2,2-trifluoroethyl)iodonium Triflate
作者:Cheng-Long Zhao、Qiu-Yan Han、Cheng-Pan Zhang
DOI:10.1021/acs.orglett.8b02793
日期:2018.10.19
An efficient and transition-metal-free method for the synthesis of the structurally diversified trifluoroethylthiol phenanthridines and 3,4-dihydroisoquinolines is described. Various 2-isothiocyanobiaryls and aryl alkyl isothiocyanates reacted with phenyl(2,2,2-trifluoroethyl)iodoniumtriflate in CH2Cl2 in the presence of trifluoromethanesulfonic acid at 40 °C to form the corresponding trifluoroet
申请人:KOREA INSTITUTE OF RADIOLOGICAL & MEDICAL SCIENCES 한국원자력의학원(220070148654) BRN ▼217-82-04745
公开号:KR101918205B1
公开(公告)日:2018-11-13
본 발명의 일 양상은 종양 선택성 RGD 펩티드 및 방사성동위원소 표지용 리간드가 2,2'-디아미노바이페닐의 양쪽의 아민에 각각 공유결합된 구조를 갖는 화학식 I의 화합물, 그 화합물에 방사성동위원소가 결합된 방사성의약품용 화합물, 그 방사성의약품용 화합물의 제조방법, 및 그 방사성의약품용 화합물을 포함하는 방사성의약품을 제공한다.
Macrocyclic bis(thioureas) derived from 2,2′-biphenyl and binaphthyl skeletons have been synthesized by reaction of 2,2′-diaminobiaryl and 2,2′-bis(isothiocyanato)biaryl derivatives. The splitting of these bis(thioureas) into two units of the respective cyclic monothioureas has been monitored by NMR, shedding some light on the factors that control these processes. Additionally, a computational study
[EN] TINTED ARTICLE HAVING A HIGH REFRACTIVE INDEX<br/>[FR] ARTICLE TEINTÉ AYANT UN INDICE DE RÉFRACTION ÉLEVÉ
申请人:PPG IND OHIO INC
公开号:WO2009038937A1
公开(公告)日:2009-03-26
Disclosed is a tinted article formed from a substrate having a refractive index of at least 1.57 comprising at least partially polymerized sulfur-containing polyurethane material and/or at least partially polymerized sulfur-containing polyurethaneurea material; an intermediate coating applied to at least a portion of the substrate; a tintable hardcoat applied to at least a portion of the intermediate coating; and tint applied to at least a portion of the tintable hardcoat. Methods for preparing the tinted articles also are provided.