Domino Reactions of Amidines with Methyl 2-Chloro-2-cyclopropylideneacetate as an Efficient Access to Cyclobutene-Annelated Pyrimidinones
作者:Marcus W. Nötzel、Karsten Rauch、Thomas Labahn、Armin de Meijere
DOI:10.1021/ol025530+
日期:2002.3.1
one-step synthesis of 2,4-diazabicyclo[4.2.0]octa-1(6),2-dien-5-ones 3 from methyl 2-chloro-2-cyclopropylideneacetate (1) and amidines 2a-c as well as N,N-dimethylguanidine (2d) is described. Similar to the benzocyclobutenes, the cyclobutene-annelated pyrimidones 3 undergo thermal ring opening and the resulting o-quinodimethane analogues readily cycloadd dienophiles to yield tetrahydroquinazolone derivatives
[反应:请参见文本]从2-氯-2-环亚丙基乙酸甲酯(1)一步一步合成2,4-二氮杂双环[4.2.0] octa-1(6),2-dien-5-ones 3描述了am2a-c以及N,N-二甲基胍(2d)。类似于苯并环丁烯,环丁烯-退火的嘧啶酮3经历热开环,并且所得的邻喹二甲烷类似物容易环加二亲二烯体以产生四氢喹唑酮衍生物。