作者:Lario V. Yerino、Morey E. Osborn、Patrick S. Mariano
DOI:10.1016/0040-4020(82)80133-6
日期:1982.1
Studies of the preparation of 1,8-dihydroazocines and transannular cyclization of hydroazocines to produce functionalized pyrrolizidines are described. Results are presented which demonstrate that unsymmetrically substituted acetylenes bearing at least one electron withdrawing groups undergo efficient cycloaddition to 1 - β - styryl - 1,2 - dihydropyridine producing in a regio-selective fashion 3,4
描述了1,8-二氢偶氮cine碱的制备和氢偶氮cine碱的环环环化以生产功能化吡咯并核苷的研究。结果表明,带有至少一个吸电子基团的不对称取代的乙炔经过有效的环加成反应以1-β-苯乙烯基-1,2-二氢吡啶,以区域选择性的方式产生3,4-二取代的-1,8-二氢偶氮嗪。以这种方式产生的二氢偶氮丙氨酸可以转化为1-甲酰基-Δ4,5-在进行甲氧基甲烷去甲酰基化然后进行酸处理时,发生令人感兴趣的重排反应以形成吡咯并核苷的环氧偶氮类。另外,在溴化条件下,可以将1,6,7,8-四氢偶氮cine碱转化为吡咯并idine。描述了在上述条件下发生的有趣的化学过程。