摘要:

Abstract3‐(4′‐Pyridyl)‐4‐amino‐5‐mercapto‐1,2,4‐triazole (1) reacted with aroyl isothiocyanates2a‐1to yield twelve novel 3‐(4′‐pyridyl)‐6‐aroylamino‐S‐triazolo [3,4‐b]‐1,3,4‐thiadiazoles,4a‐1. Triethylamine was necessary for the condensation of1with phenyl isothiocyanate (3) to give 3‐(4′‐ pyridyl)‐6‐phenylamino‐S‐triazolo [3,4‐b]‐1,3,4‐thiadiazole (6). The structures were confirmed by the elemental and spectral analyses. Their antibacterial activity againstB.Subtil

ISSN:1001-604X    

DOI:10.1002/cjoc.19920100111

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim    

年代:1992

数据来源: WILEY

摘要:

AbstractDirect and sensitized photolyses of 1‐biphenylyl‐2,2‐dimethylcyclopropane gave 2‐methyl‐4‐biphenylyl‐1‐butene as sole product. Comparison of the product formation quantum yields at zero conversion in direct and sensitized photolyses (1.7 × 10−3vs. 1.8 × 10−3) indicated that the rearrangement took place from the triplet excited state in both cases. A stepwise mechanism involving disrotatory ring opening of the cyclopropane and subsequent 1,3‐H suprafacial shift is proposed and is consistent with the reaction multiplicity result, the orbital and state correlation diagram analyses as well as the prediction based on the

ISSN:1001-604X    

DOI:10.1002/cjoc.19920100112

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim    

年代:1992

数据来源: WILEY

摘要:

AbstractThe photostimulated reaction of halonaphthalene with a series of carbanions derived from propionic acid derivatives in liquid ammonia led to the naphthylation at α‐carbon of the carbanions in an isolated yield ranging from 25% to 86%. In all cases, the dehalonaphthalenes were found to be by‐products and the reaction was inhibited byp‐dinitrobenzene. An electron transfer from the carbanion to the halonaphthalene followed by ejection of halogen led to naphthyl radical, as predicted by comparing the LUMOs of the carbanions and the halonaphthalenes, was involved in the process. Absence of the alkylnaphthalene and 1,2‐dinaphthylalkane in the products indicates the smooth electron transfer between (Naph‐Nu)− and Naph‐X.C‐vs.O‐naphthylation is fully addressed in terms of MNDO calculations and a

ISSN:1001-604X    

DOI:10.1002/cjoc.19920100113

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim    

年代:1992

数据来源: WILEY

摘要:

Abstract3,6‐Diarylidene‐2,5‐piperazinediones (2) and 3‐alkylidene‐6‐arylidene‐2,5‐piperazinediones (6) were synthesized from diacetyl‐2,5‐piperazinedione (1) under solid‐liquid phase transfer catalytic conditions.2could be easily convered to α‐amino acid by reducing with zinc powder and hydrolyzing with concentrated hydrochloric acid. The effect of different phase transfer catalysts and reaction

ISSN:1001-604X    

DOI:10.1002/cjoc.19920100114

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim    

年代:1992

数据来源: WILEY

ISSN:1001-604X    

DOI:10.1002/cjoc.19920100115

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim    

年代:1992

数据来源: WILEY

ISSN:1001-604X    

DOI:10.1002/cjoc.19920100116

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim    

年代:1992

数据来源: WILEY

ISSN:1001-604X    

DOI:10.1002/cjoc.19920100117

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA, Weinheim    

年代:1992

数据来源: WILEY