A Trans-Stereoselective Synthesis of 3-Halo-4-alkyl(aryl)-NH-azetidin-2-ones
摘要:
Conrotatory ring closure of 1-halo-3-aza-4-alkyl-1,3-dienes in refluxing toluene gives rise to 3-halo-4-aryl-2-azetidinones in satisfactory yields. Dehalogenation of the resulting beta-lactams by tris(trimethylsilyl)silane furnished 3-unsubstituted azetidinones, valuable intermediates in the synthesis of biologically active compounds.
A Trans-Stereoselective Synthesis of 3-Halo-4-alkyl(aryl)-NH-azetidin-2-ones
摘要:
Conrotatory ring closure of 1-halo-3-aza-4-alkyl-1,3-dienes in refluxing toluene gives rise to 3-halo-4-aryl-2-azetidinones in satisfactory yields. Dehalogenation of the resulting beta-lactams by tris(trimethylsilyl)silane furnished 3-unsubstituted azetidinones, valuable intermediates in the synthesis of biologically active compounds.
Hetero-Diels-Alder (HDA) Strategy for the Preparation of 6-Aryl- and Heteroaryl-Substituted Piperidin-2-one Scaffolds: Experimental and Theoretical Studies
Preparation of piperidine-2-one scaffolds by the hetero-Diels–Alder (HAD) reaction, assisted by microwaves, is described. The versatility of this new approach has been demonstrated by the synthesis of racemic (±)-2-phenylpiperidine. Theoretical calculations have allowed us to clarify the factors that govern ring closure to form four-membered rings, arising from a Staudinger-type electrocyclization
描述了在微波辅助下通过异狄尔斯-阿尔德 (HAD) 反应制备哌啶-2-one 支架。这种新方法的多功能性已通过外消旋 (±)-2-苯基哌啶的合成得到证明。理论计算使我们能够阐明控制闭环形成四元环的因素,由施陶丁格型电环化产生,和/或通过经典的 [4+2] HAD 环化产生六元环。正如计算研究所预期的那样,可以通过增加亲二烯体的电子需求来降低这种竞争。