Fungicidal compounds having the formula (I): ##STR1## in which any two of K, L and M are nitrogen and the other is CY wherein Y is H, halogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, cyano, nitro or trifluoromethyl; n is 0 or 1 and X is an optionally substituted aromatic or heteroaromatic ring.
Intramolecular diels-alder reactions of 1,2,4-triazines.
作者:Edward C. Taylor、John E. Macor、Joseph L. Pont
DOI:10.1016/s0040-4020(01)87690-0
日期:1987.1
IntramolecularinverseelectrondemandDiels-Alderreactions of 1,2,4-triazines have been effectively utilized for the synthesis of furo[2,3-b] pyridines, 2,3-dihydropyrano[2,3-b]pyridines, and 2,3-dihydropyrrolo-[2,3-b]pyridines.
Intramolecular Diels-Alder reactions of 1,2,4-triazines: Exploitation of the Thorpe-Ingold effect for the synthesis of 2,3-cyclopentenopyridines and 5,6,7,8-tetrahydroquinolines
作者:Edward C. Taylor、John E. Macor
DOI:10.1016/s0040-4039(00)84460-3
日期:1986.1
Intramolecularinverseelectron-demandDiels-Alderreactions of 1,2,4-triazines assisted by the Thorpe-Ingold effect have been utilized in novel syntheses of 2,3-cyclopentenopyridines and 5,6,7,8-tetrahydroquinolines.
Further intramolecular reactions of 1,2,4-triazines. Synthesis of furo[2,3-]pyridines and dihydropyrano[2,3-]pyridines
作者:Edward C. Taylor、John E. Macor
DOI:10.1016/s0040-4039(00)85497-0
日期:1986.1
3-(3-Butynyloxy)- and 3-(4-pentnyloxy)-1,2,4-triazines undergo facile intramolecular Diels-Alder reactions to yield 2,3-dihydrofuro(2,3-)pyridines and dihydropyrano(2,3-)pyridines respectively. The former are readily dehydrogenated with DDQ to furo(2,3-)pyridines.
intramolecular ihDA/rDA reaction of the alkyne tether gave a five-membered ring formation benefited from a Thorpe-Ingold effect. Accordingly, the cycloaddition occurred at a rather low temperature (<70 °C), in contrast to the 150–200 °C usually required in other instances.5 Unfortunately, the scope of this original C−C bond construction and stepwise strategy is rather limited, and led to yields from low to moderate
螺吲哚是多种生物活性和天然存在的化合物的核心结构。1在该领域,方案 1A ( I , Y=CR)中描述的羟吲哚衍生的四环结构引发了各种研究,旨在详细说明该家族中的生物活性产品,或开发允许构建各种类似物的原始方法。2, 3尽管吡啶衍生物被认为是药物化学中的特殊结构,但4这种氮杂芳烃在四环化合物(例如I (Y=N))中却出人意料地不存在,这可能是由于缺乏合适的合成策略。 方案一 在图查看器中打开微软幻灯片软件 走向融合的非芳族/杂芳族自行车:背景和新计划。 多米诺反电子需求杂-Diels-Alder/逆-Diels-Alder ( ih DA/ r DA) 反应发生在1,2,4-三嗪(2-氮杂二烯)和亲二烯体之间-建立有效的环加成策略来构建吡啶衍生物(方案1B)。5大量工作致力于通过双功能异亲核试剂(Nu(Het)-H、Nu=O、 3-甲基磺酰基-1,2,4-三嗪在 C3 处发生 S N Ar